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RTTA Revision: 2020 1.1 Author: N.Archer
PRODUCT INSTRUCTION MANUAL
Product Range: Rotary Telescopic Transfer Arm (RTTA)
Product Description
Rotary Telescopic Transfer Arm with arm 760mm extension.
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TABLE OF CONTENTS
1 IMPORTANT SAFETY INFORMATION ............................................................................................... 3
2 UNPACKING & INSPECTION ............................................................................................................ 3
3 INSTALLATION ................................................................................................................................. 6
3.1 Preparation ............................................................................................................................. 6
3.2 Mounting the Arm Drive Assembly to the chamber ............................................................... 6
3.3 Installing the Telescopic Arm Assembly .................................................................................. 7
4 ROTATING, ALIGNING AND EXTENDING THE TELESCOPIC ARM ................................................... 10
4.1 Manual Operation ................................................................................................................. 10
4.2 Motorised Operation ............................................................................................................ 12
5 BAKEOUT PROCEDURE .................................................................................................................. 26
6 APPENDIX A | KEY COMPONENTS FOR MANUAL & MOTORISED RTTA VERSIONS. ..................... 30
6.1 Manual Version ..................................................................................................................... 30
6.2 Motorised Version ................................................................................................................ 31
7 KEY COMPONENT SPECIFICATIONS............................................................................................... 32
7.1 LSM64 Specifications ............................................................................................................ 32
7.1.1 LSM variants .................................................................................................................. 32
7.2 MD64LB MagiDrive ............................................................................................................... 33
7.2.1 Motorized MD64LB ....................................................................................................... 33
7.2.2 Manual MD64LB ............................................................................................................ 34
7.2.3 MD64LB Specifications .................................................................................................. 35
7.2.4 MD64LB variants ........................................................................................................... 35
7.3 MD40 MagiDrive ................................................................................................................... 36
7.3.1 Motorized MD40 ........................................................................................................... 36
7.3.2 Manual MD40 ............................................................................................................... 37
7.3.3 MD40 Specification ....................................................................................................... 37
7.3.4 MD40 variants ............................................................................................................... 38
7.4 Service Collar. ........................................................................................................................ 38
7.4.1 Service Collar variants. .................................................................................................. 39
8 WIRING DIAGRAMS. ...................................................................................................................... 40
8.1 LSM64 Limit Switch wiring diagram (WD002). ..................................................................... 40
8.2 MD64LB (& MD100) switch wiring diagram (6213-048). ...................................................... 41
8.3 Main arm switch wiring diagram (6213-049). ....................................................................... 42
8.4 Main arm to feed-through wiring diagram (6213-051). ....................................................... 43
9 MATERIAL INFORMATION ............................................................................................................. 44
RTTA PRODUCT INSTRUCTION MANUAL
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1 IMPORTANT SAFETY INFORMATION
This document is intended as a user guide to operation as determined by the design.
The instrument described in this document should not be used on any system where toxic,
flammable, corrosive or otherwise hazardous gases or substances may be introduced without prior
discussion with UHV Design.
Hands and fingers should be kept well clear of any moving parts during operation or whilst at
vacuum.
This equipment should be put into service only by Competent Persons who have first studied this
manual and followed carefully the recommended procedures.
2 UNPACKING & INSPECTION
The telescopic transfer manipulator is dispatched (for shipment via couriers) in a wooden crate on a
palette. The palette contains a stiff cardboard transit case suspended inside it by shock-absorbing
foam. The shipping materials should be retained in the event that the manipulator must be returned
to the supplier. The manipulator has been shipped in two parts; the telescopic transfer arm
assembly (held between two shipping plates) and the drive assembly.
Upon receipt of this package, the following steps should be taken:
o Check the ‘Shock watch’ located on the exterior of this package.
o If the indicator is red, accept the shipment, but note that activation has taken place on the
bill of lading.
o Advise suppliers immediately if activation has taken place.
o Whether activated or not, always inspect the shipment for damage upon receipt.
o In the unlikely event that goods are delivered damaged, please contact your supplier
immediately.
1. IMPORTANT SAFETY INFORMATION!
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Remove the lid from the transit case and open the inner box. Remove any small components /
manuals etc. packed beside the main assemblies, together with any additional packaging to expose
the manipulator.
Lift the RTTA parts from the inner case, being careful to avoid damage to the protruding parts, and
place on a flat work surface. The manipulator main assemblies are double bagged allowing the final
wrapping to be removed in a clean environment.
IMPORTANT INFORMATION!
The Arm Drive Assembly section of this manipulator is very heavy (more than 25kg for assemblies with z-axis). Please handle with extreme care with reference to your health and safety policies.
Packing Material Shipping Box
Arm Drive
Assembly Telescopic Arm
Assembly
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Once the Telescopic transfer assembly is removed from the protective coverings it should be
removed from the shipping plates and rods as shown below.
IMPORTANT INFORMATION!
Remove the transport screw holding all of the sections of the Telescopic Arm Assembly in position.
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3 INSTALLATION
3.1 Preparation
IMPORTANT IINFORMATION!
The Arm Drive Assembly section of this manipulator is very heavy.
Carefully remove the RTTA sub-assemblies, motor drivers and cables from the shipping container.
Carefully remove the plastic wrapping from the sub-assemblies.
3.2 Mounting the Arm Drive Assembly to the chamber
a. Fit the head mounting ring and retaining clip onto the head mounting tube.
b. Fit the Arm Drive Assembly onto the radial distribution chamber using a CF100 (6”) conflat gasket and then screw it down into position using 16 x appropriate studs, nuts and washers.
16 x Nuts & Washers
Mounting Ring
& Retaining Clip
16 x Studs
Copper Gasket
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3.3 Installing the Telescopic Arm Assembly
a. Extend the drive arm assembly and feed it through a CF150, 8” port in the radial distribution chamber taking care not to collide with the chamber.
b. If not already fitted, attach the shaft coupling (packed in a separate bag) to the RTTA arm when inserted into the chamber as below.
c. If already fitted, loosen M3 Screw on the Shaft Coupling (shown below) and remove prior to installing the RTTA arm into the chamber. When inserted into the chamber, refit the Shaft Coupling over the Rotation Shaft (ensuring that it is flush with lower stop) and tighten the collar using the M3 Screw.
Care must be taken to avoid accidental damage
when inserting the arm through the port
Shaft coupling
M3 Screw
Rotation shaft
Lower stop
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d. Lift the arm assembly up to meet the head support tube, ensuring the drive pin engages with the flexible coupling inside the head support tube and the keyway in the tube is aligned with the reference feature in the head assembly bracket. It might be necessary to manually extend the arm to fully insert the shaft coupling.
e. Rotate the head assembly mounting ring until the screws are engaged as shown and tighten the 4x M4x12 socket head screws down firmly.
Reference
feature
Flexible coupling
Head mounting ring
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f. Ensure the limit switch in vacuum D-sub connector is plugged in firmly.
Fitting the motor assembly to the lift/lower linear shift mechanism (if supplied)
a. Position the motor assembly in line with the mounting holes but tilt slightly to allow the drive belt to be placed over both pulleys (marked A & B).
b. Screw the motor assembly into position (the drive belt should now be under tension).
c. Fit the belt cover.
Motor assembly
Drive belt
Belt cover
A
B
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4 ROTATING, ALIGNING AND EXTENDING THE TELESCOPIC ARM
4.1 Manual Operation
Setting the stop ring to align the RTTA with the desired ports
The position stop ring must be set up to allow the Telescopic Transfer Arm to be consistently
positioned in-line with the ports of a radial distribution chamber.
You will need the following tools:
o 2.5mm Allen Key
o 3mm Allen Key
Setting the top ring for rough alignment of the RTTA
a. Release the Position Stop Lever so that the ring is free to rotate.
b. Loosen the six M4 button head screws holding the stop mounting ring in position.
c. Rotate the MD64LB thimble until the Transfer Arm is pointing directly into the most commonly used distribution chamber port. Carefully extend the arm in the port to get precise alignment.
d. Rotate the Stop Pin Mounting Ring until a Stop Pin is directly adjacent to the pair of spring loaded detent rollers.
e. Flip the Position Stop lever to engage the rollers on the stop pin.
f. Re-tighten the M4 button head screws to clamp the stop mounting ring in position.
g. Retract the transfer arm to its home position.
Position Stop Lever
Stop Pin
Stop Pin
Mounting Ring M4 Button Head
Screws x 6
Position Stop Rollers
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Fine adjustment of port positions
a. Release the Position Stop Lever so that the ring is free to rotate.
b. Rotate the MD64LB thimble until the Transfer Arm is pointing directly into another distribution chamber port. Carefully extend the arm in the port to get a precise alignment.
c. Loosen the M4 socket cap screw clamping the stop pin in position.
d. Flip the Position Stop Lever to engage the rollers on this stop pin.
e. Re-tighten the screw to hold the pin firmly in position.
f. Repeat this fine adjustment procedure for all radial distribution chamber ports.
M4 Screw
Stop Pin
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4.2 Motorised Operation
Control Software Installation
‘McTerminal’ software will need to be installed on a suitable laptop/PC. The software will have been
supplied as a ZIP file but can also be downloaded from the following link:
http://www.mclennan.co.uk/product/mcterminal
Initial set-up & checking communication link
Ensure all cables are plugged in correctly as per the schematic below for the a 3-axis RTTA. For the 2-
axis RTTA the same procedure applies although the Jog Box and RS232 will terminate on the Axis 2
controller.
The default configuration for the RTTA is as follows:
AXIS 1 – RTTA Arm Extension
AXIS 2 – RTTA Arm Rotation
AXIS 3 – RTTA Lift/Lower (if applicable)
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Plug the motor and limit switch cables onto the RTTA.
AXIS 2 Motor Cable
AXIS 1 Motor Cable
AXIS 2 Limit Cable
AXIS 1 Limit Cable
AXIS 3 Limit Cable
AXIS 3
Motor Cable
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We recommend plugging the cables into the SIMSTEP controllers in the following order.
Step 1 | RS232 Cables
Step 2 | Jog Box Cables (GREEN) – if applicable
RS232
Termination
plug in ‘Out’
socket on Axis 3 RS232 connection
from PC to ‘In’
Jog Box
Termination plug
in ‘B’ on Axis 3 Plug connection
from Jog Box
controller into ‘A’
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Step 3 | Limit Switch Cables (RED)
Step 4 | Insert the Power and Motor Cables
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Step 5 | Switch on the controllers and the front LCD displays
If all connections are OK the front LCD displays will show either one of the following status’:
If the LED displays are showing any other status symbols, check all connections are in the right place
and make sure that the RS232 and Jog Box termination plugs are inserted.
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Step 6 | Launch the McTerminal software
If the message “comport unavailable” appears, click on the “Setup Comms” button in the lower left-
hand corner as shown below.
Pick from the following list until one is found that does not give an error message:
Once the comms are set up, click on the monitor button in the lower left corner of the screen.
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The following screen should appear if all settings are correct.
Note: the colour of the Upper Limit, Lower Limit and Datum/Input buttons may change, depending on
whether or not the relevant switch is currently activated
Entering Control Commands to move the RTTA
Before entering any commands, ensure that the
desired Axis is selected in ‘A’.
A number of default values have been set prior to
shipping the RTTA (see appendix A). These values
should only be changed if required.
Commands can be issued in the command line
shown as ‘B’.
IMPORTANT IINFORMATION!
During set up & testing DO NOT EXTEND THE ARM (AXIS ADDRESS 1) until rotational port alignment has been completed (see following pages)
A
B
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Finding the rotational ‘Home Position’ and direction of rotation (AXIS 2)
Ensure Axis Address 2 is selected.
To find ‘Home’ follow this sequence:
a. RIGHT CLICK on the ‘Home to Datum’ button highlighted below. The RTTA Arm will rotate until a limit switch is activated.
b. If when the RTTA Arm has stopped a small dot is displayed on the LCD screen on the front of the MSMC controller the ‘Home’ position has been captured and stored.
c. If when the RTTA Arm has stopped rotating there is no small dot displayed LEFT CLICK on the ‘Home to Datum’ button highlighted above. The RTTA Arm will rotate in the opposite direction until the other limit switch is activated. There should now be a small dot on the LCD screen to indicate that the ‘Home’ position has been captured and stored.
Make a note of whether LEFT or RIGHT click found home as you will need to repeat this process
every time the controller loses power or is switched off and then on.
Note: The display may also show U or L whilst the datum capture (home) dot is displayed, this is
normal.
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Rotating the telescopic arm to align with a port
All commands issued to the controller are in motor steps. The controller can move either relative from
its current position or absolute from the saved HOME position (assuming the Home position has been
found and captured by following the correct procedure). Position can also be set using the Jog Box.
The stepper motor controller is set to count in 1/16 steps.
One full revolution of the RTTA Arm = 640,000 counts x 1/16 steps.
Therefore 1,778 counts =1/16th step = 1o rotation.
There are 2 key drive commands:
MR (Move Relative) to move a number of steps from the current position
Using the command ‘MR(number of counts)’ will rotate the RTTA Arm the specified number of counts
from its current position.
E.g. IF you enter ‘MR80000’ into the command line the RTTA Arm will rotate 80,000 counts in one
direction (which will move the arm by 45o). ‘MR-80000’ will rotate the RTTA Arm 80,000 steps in the
opposite direction. The RTTA Arm will stop rotating before the desired number of steps if a limit switch
is activated.
MA (Move Absolute) to move a number of steps relative to the home position
To rotate the RTTA Arm relative to the HOME position, use the command MA(number of steps). e.g.
MA10000 from the monitor window.
In this case, no matter what the current position of the RTTA Arm, the RTTA Arm will move to the
rotational position that corresponds to the specified number of steps from the home position.
For example:
To rotate to the home position: enter ‘MA0’ into the monitor window (i.e. the position equal to 0 steps
from HOME).
i.e. to rotate the RTTA Arm by 90 degrees you would issue the MR160000 command to rotate the
RTTA Arm 90 degrees from its current position. The Arm will rotate until it reaches the required
number of steps OR until it hits a limit switch and stops automatically.
MR10000
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Typical Motorised RTTA port alignment & recording walkthrough
STEP 1 – Install the RTTA as per the instructions on pages 6-9 and complete the controller set-up as
described on pages 12-20.
IMPORTANT IINFORMATION!
During the initial alignment of the RTTA with the required port ensure that the RTTA Arm is retracted. Ensure that AXIS 2 is selected before continuing.
STEP 2 – Find the rotational home position as detailed on page 19. The red dot should be visible on
the controller for AXIS 2.
STEP 3 – In this example Home position has been set and a note made that to home the RTTA Arm a
right-click on the ‘Home to Datum’ button was required. Recording this saves time should you need
to Home AXIS 2 (Arm rotation) at a later date.
Example: The ‘Home’ position of the RTTA Arm
.
Port for
alignment
RTTA Home
Position (AXIS 2)
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STEP 4 – Enter a small value in the command line (MR200) to check that the RTTA Arm rotates
smoothly. If the RTTA Arm rotates smoothly and you have confirmed that the RTTA Arm is retracted
continue to STEP 5.
STEP 5 – Using the jog box (optional extra – see page 25) or MR command – rotate the RTTA until the
arm is approximately aligned with the desired port. In this case the Arm needs to be rotated
approximately 90 degrees so the command MR160000 is used.
Note: depending on the set-up, the value MR-160000 may be required to rotate the arm to the desired
position.
MR200
MR10000
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Check alignment by extending the telescopic arm carefully (by selecting AXIS 1), watching for potential
collision between the mechanism and the port. If it looks as though the arm mechanism may clash,
retract the arm and adjust rotation.
When the arm can be extended safely through the port, select AXIS 2 again and make a note of the
STEP position as shown below (i.e. 5370)
Watch for potential clashes between
the Arm / Arm mechanism and the
port when extending – carefully
adjust rotation if necessary
2
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STEP 6 – Repeat for all required port positions.
STEP 7 – When all of the port positions have been recorded as MA values you should be able to
produce a command sheet with key notes something similar to the example below:
These commands will stay the same but remember that every time the controller is switched on the
RTTA Axes must be ‘Homed’ by following the ‘right click’ / ‘left click’ process.
Follow the same process to record the desired Arm Extension (AXIS 1) and Arm Lift/Lower (AXIS 3)
positions.
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4.4. Using the JOG BOX (optional extra)
The optional Jog box provides a convenient way to manually control motor control systems by
providing the following manual control functions:
o Bi-directional single step (jog) function by momentary depression of ‘+’ or ‘-’ buttons.
o Slow speed continuous operation in desired direction by the depression and holding of the
‘+’ or ‘-’ buttons. The speed of movement can be programmed using SJ command into the
Sim-Step during commissioning.
o Fast speed, continuous operation in desired direction by depressing & holding the ‘F’ button
together with either the ‘+ or ‘- button. The fast positioning rates are can also be
programmed using SF command into the Sim-Step during commissioning.
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5 BAKEOUT PROCEDURE
The entire RTTA range is designed to be fully bakeable to a maximum of 250°C on removal of motors
and gear-boxes etc. Manually operated RTTA’s are fully bakeable with no requirement to remove
any components.
To prepare a motorized RTTA for bakeout you will need the following tools:
o A set of metric Allen keys
IMPORTANT IINFORMATION!
Do not exceed 250°C bakeout!
Arm extension motor
assembly
Arm lift/lower motor
assembly
Arm rotation motor
assembly
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Remove the Arm lift/lower motor assembly a. Remove the M6 screw from the belt cover – remove the belt cover.
b. Remove the two M6 screws fastening the motor mounting bracket to the top brace – tilt the motor assembly up to release the pulley from the timing belt.
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Remove the Arm rotation motor assembly a. Remove the six M5 screws from the belt cover – remove the belt cover.
b. Remove the two M6 screws fastening the motor mounting bracket to the top brace. Rotate the motor assembly away from the bracketry so that it can be tilted up slightly and the timing belt can be removed over the top of the RTTA.
Belt covers x 2
M5 screws x 6
Timing belt
M6 screws x 2
Motor assembly
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Remove the Arm Extension motor assembly a. Remove the four M5 screws from the motor mount. b. Remove the motor assembly.
The RTTA can now be baked to a maximum of 250oC
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6 APPENDIX A | KEY COMPONENTS FOR MANUAL & MOTORISED RTTA VERSIONS.
6.1 Manual Version
The manually operated RTTA consists of the following components:
o Manual MD40 MagiDrive: to drive the ‘arm’ extension motion manually.
o Manual MD64LB hollow MagiDrive: to provide polar rotation of the ‘arm’ manually.
o Manual LSM64 linear Shift Mechanism (optional): to provide 50mm of lift/lowering of the
‘arm’ to collect / hand-off the sample manually.
o Telescopic Transfer Arm system: to provide up to 760mm of ‘arm’ extension motion.
o Single port service collar - blanked off.
Manual MD40 magnetically-
coupled rotary drive
Manual MD64LB magnetically-
coupled rotary drive
Manual LSM64
linear shift
mechanism
Service collar
Telescopic
Transfer Arm
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6.2 Motorised Version
The motorised RTTA consists of the following components:
o Motorized M40 MagiDrive: to drive the ‘arm’ extension motion, these can be stepper motor
or Smart motor driven.
o Motorized MD64LB hollow MagiDrive: to provide polar rotation of the ‘arm’, these can be
stepper motor or Smart motor driven.
o Motorized LSM64 linear Shift Mechanism (optional): to provide 50mm of lift/lowering of the
‘arm’ to collect / hand-off the sample, these can be stepper motor or Smart motor driven.
o Telescopic Transfer Arm system: to provide up to 760mm of ‘arm’ extension motion.
o Single port service collar with feed-through to in-vacuum position switches.
Service collar
Motorised MD40
magnetically-coupled rotary
drive
Motorised MD64LB
magnetically-coupled rotary drive
Motorised LSM64
linear shift
mechanism
Telescopic
Transfer Arm
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7 KEY COMPONENT SPECIFICATIONS
7.1 LSM64 Specifications
a. Flange style:
Travelling flange: CF64, Ø114mm od with tapped holes in a straddled configuration.
System mounting flange: CF64, Ø114mm od with tapped holes in a straddled configuration.
b. Stroke: 50mm (standard).
c. Flange face to flange face: 89.0mm compressed, 139.0mm extended.
d. Clear bore: nominal 65mm (bellows i.d.).
e. Demountable bellows assembly.
f. Maximum applied load: 245N.
g. Torque required to move 245N load against one atmosphere acting on the bellows is in the order of 0.75Nm at the lead-screw pulley if motorized, or 0.5Nm at the hand-wheel.
h. Bakeable limit switches for end of travel detection on motorized version only.
i. Drive gearing (manual)
Lead-screw (via hand-wheel): 0.1” pitch (1 rotation = 0.1” / 2.54mm travel)
j. Drive gearing (Motorized)
Lead-screw: 0.1” pitch (1 rotation = 0.1” / 2.54mm travel).
Gearbox to lead-screw: Pulley ratio 1:1
Gearbox ratio: 50:1
k. Precision stainless steel ACME lead-screw supported in ball races.
l. The guidance and support mechanism uses large plain bearings (steel backed bronze matrix with a PTFE/lead overlay) running on a precision ground stainless steel bar. A further ground rod provides an anti-rotation system.
7.1.1 LSM variants
UHV Design also offer a range of customer special variants to our standard range of motorized /
manual LSM’s, some of these are described below.
VARIANT DESCRIPTION
Non Standard stroke. The LSM fitted has a stroke specified by the customer (other than 50mm). Commonly 25, 75 or 100mm.
Rotary Encoder. The LSM is fitted with a stepper motor that includes a built-in 500 line encoder.
Linear Encoder. The LSM is fitted with a Renishaw LM10 magnetic linear encoder.
Customer specified Encoder. The LSM is fitted with a customer specified rotary / linear encoder.
Customer specified drive. The LSM is fitted with an alternative drive specified by the customer.
No motor. The LSM is supplied with no motor fitted allowing the customer to fit their own.
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7.2 MD64LB MagiDrive
The MD64LB is a high torque hollow magnetically coupled rotary drive. It is directly coupled to the
telescopic transfer arm head assembly allowing it to be rotated between radial distribution chamber
ports.
7.2.1 Motorized MD64LB
The Motorized MD64LB is supplied fitted with either a stepper motor or Smart motor & combined
100:1 gearbox. The drive is fitted with limit and home micro-switches that are activated by an
adjustable setting ring.
Reduced backlash drive
thimble
Motor & gearbox
Timing belt
Switches wired to
Lemo connector
Adjustable position
setting ring
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7.2.2 Manual MD64LB
The manual MD64LB fitted to this system is supplied with an enlarged and knurled thimble that can
be used to rotate the drive into the desired position.
Fitted to the top of the thimble ring are a number of adjustable position stops, these engage with a
pair of spring-loaded bearings that can be with-drawn while the drive is rotated into position then
re-engaged to hold the drive firmly in position by using a simple lever.
The adjustable position stops are screwed into captivated nuts beneath a circumferential slot,
loosening the position stop mounting screw allows it to be slid along the slot to fine adjust the stop
into the exact position of a radial distribution chamber port.
The drive also includes a locking screw that can be used to hold the thimble firmly in any rotational
position.
Adjustable position stop
Spring loaded
bearings
Spring defeat
lever Thimble ring
Position locking screw
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7.2.3 MD64LB Specifications
a. Flange style:
System mounting flange: CF64, Ø114mm od with clearance holes.
Rear mounting flange: CF64, Ø114mm od rotatable with tapped holes.
b. Flange face to flange face: 155mm
c. The drive shaft is a flanged tube with 6 x M3 through holes on a 57.5 PCD. The tube has a Ø48.5mm clear bore.
d. Drive gearing (Motorized):
Gearbox to thimble: Pulley ratio2:1 (via reduced backlash pulleys)
Gearbox: Ratio 100:1
e. Drive gearing (manual): N/A
f. Load Ratings: Axial 400N
Radial 8300N
g. Magnetic Breakaway Torque: 37Nm
h. Positioning (motorized):
Bakeable limit switches for end of rotation and home detection. The limit switch actuation ring allows the drive to be rotated through +/-180° between limits with the ‘home’ position set just prior to the clockwise limit.
i. Positioning (manual):
Drive position ring with integrated adjustable stops that engage with a spring-loaded bearing arrangement to give repeatable manual positioning.
7.2.4 MD64LB variants
UHV Design also offer a range of customer special variants to our standard range of motorized /
manual MD64LB’s, some of these are described below.
VARIANT DESCRIPTION
Rotary Encoder. The MD64LB is fitted with a stepper motor that includes a built-in 500 line encoder.
Customer specified Encoder. The MD64LB is fitted with a customer specified rotary encoder.
Customer specified drive. The MD64LB is fitted with an alternative drive specified by the customer.
No motor. The MD64LB is supplied with no motor fitted allowing the customer to fit their own.
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7.3 MD40 MagiDrive
The MD40 is a high torque magnetically coupled rotary drive. It is directly coupled to the telescopic
arm assembly (via the Cardan mechanism) allowing it to be extended and retracted into a radial
distribution chamber port.
The entire MD40 drive is fitted to the rotating thimble of the MD64LB, i.e. it rotates with the larger
drive, this eliminates cross talking of the motors and therefore the need to synchronize the drives to
hold the arms extended position while it is rotated.
7.3.1 Motorized MD40
The motorized MD40 is supplied fitted with either a stepper motor or Smart motor & combined
100:1 gearbox. This drive is not fitted with limit and home switches as the position of the arm is
read at the actual arm assembly.
Gearbox & motor
Drive cam
Motor mounting
tube
Drive shaft
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7.3.2 Manual MD40
The manual MD40 fitted to this system is supplied with a knurled stop screw that can be used to
hold the transfer arm in the desired position.
7.3.3 MD40 Specification
a. Flange style:
System mounting flange: CF35, Ø70mm od with clearance holes.
The drive shaft is a flanged tube with 3 x M3 through holes on a 26.0 PCD. The tube has a Ø12.0mm bore x 80mm deep.
b. Drive gearing (motorized):
Gearbox to thimble: Direct cam drive 1:1
Gearbox: Ratio 100:1
Drive gearing (manual): N/A
c. Load Ratings: Axial 142N
Radial 285N
d. Magnetic Breakaway Torque: 9.0Nm
e. Positioning (motorized): No limit switches fitted
f. Positioning (manual): N/A
Locking screw
Calibrated thimble
Drive shaft
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7.3.4 MD40 variants
UHV Design also offer a range of customer special variants to our standard range of motorized /
manual MD40’s, some of these are described below.
VARIANT DESCRIPTION
Rotary Encoder. The MD40 is fitted with a stepper motor that includes a built-in 500 line encoder.
Customer specified Encoder. The MD40 is fitted with a customer specified rotary encoder.
Customer specified drive. The MD40 is fitted with an alternative drive specified by the customer.
No motor. The MD40 is supplied with no motor fitted allowing the customer to fit their own.
7.4 Service Collar.
The service collar has two functions; it provides a feed-through into vacuum for the limit switches on
the telescopic transfer arm (in motorized versions) and it provides radial support for the tube that
mounts the transfer arm.
The service collar is fitted to all motorized RTTA’s and also RTTA’s that have a z-shift fitted.
a. Flanges:
Top: CF64, Ø114mm od with clear holes.
Bottom: CF100, Ø150mm od with clear holes.
b. Support tube: Ø72mm bearing at 56mm from bottom flange face.
c. 1 x Service Collar branch for feed-through in vacuum:
d. Six pin feed-through for telescopic transfer arm micro-switch type 229-CM6-CF16. (Mating connectors: 220-CON6-AIR [air-side] & 220-CON-6-SR [in vacuum]).
e. In vacuum D-type plug for connection to the socket fitted to the telescopic transfer arm. D-type to 220-CON6-SR wiring diagram, 6213-051 is appended to this manual.
Limit switch
feed-through
Service collar
Shaft support
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7.4.1 Service Collar variants.
UHV Design also offer a range of customer special variants to our standard range of service
collars, some of these are described below.
VARIANT DESCRIPTION
Bespoke system mounting flange size.
The service collar can be fitted with a customer specified system mounting flange.
Bespoke service collar. The service collar can be manufactured to customer specifications, i.e. with additional side ports.
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8 WIRING DIAGRAMS.
For motorized RTTAs only.
8.1 LSM64 Limit Switch wiring diagram (WD002).
The LSM64 is supplied pre-wired to the diagram below using PTFE coated copper wire crimped into
spade connectors that are screwed down to the micro-switch terminals. The bulk head connector
used is a LEMO type EGG.1B.306.CYM. This arrangement is fully bakeable to 250C.
NOTE:
Mating LEMO connector FHG.1B.306.CLAD42Z & cable relief is included.
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8.2 MD64LB (& MD100) switch wiring diagram (6213-048).
The MD64LB is supplied pre-wired to the diagram below using PTFE coated copper wire crimped into
spade connectors that are screwed down to the micro-switch terminals. The bulk head connector
used is a LEMO type EGG.1B.306.CYM. This arrangement is fully bakeable to 250C.
NOTE:
Mating LEMO connector FGG.1B.306.CLAD42Z & cable relief is included.
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8.3 Main arm switch wiring diagram (6213-049).
The extension arm is supplied pre-wired to the diagram below using Kapton wire crimped into spade
connectors that are screwed down to the micro-switch terminals. The connector used is an Allectra
211-MS-09-PK in vacuum D-type plug. This arrangement is fully bakeable to 250C.
NOTE:
The D-type connector is fixed to the extension arm head assembly and should be plugged into the
mating half on final assembly of the RTTA into the radial distribution chamber.
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8.4 Main arm to feed-through wiring diagram (6213-051).
The service collar is supplied pre-wired to the diagram below using Kapton wire. The connectors
used are an Allectra 211-MS-09-PK in vacuum D-type plug & an Allectra 220-CM6-C16 feed-through.
This arrangement is fully bakeable to 250C.
NOTES:
a. The 220-CM6 feed-through contains in-vacuum pins that link to the wiring from the D-type connector via an in-vacuum plug, part number 220-CON-6-SR.
b. Mating Allectra air-side plug 220-CON6-AIR & pins are included.
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9 MATERIAL INFORMATION
The following table details materials used in an RTTA that will be exposed to the vacuum
environment.
COMPONENTS MATERIAL Extension arm elements Stainless Steel 304
Extension arm rolling bearings Stainless Steel 440 races & Silicon Nitride balls
Extension Arm drive pin Aluminium Bronze
Gear elements Stainless Steel 304 / 316 Tungsten disulfide treated working surfaces
Extension drive arms Aluminium HE30
Anti-backlash spring Stainless Steel 304
Assembly hanger brackets Aluminium HE30
Shaft coupling Stainless Steel 304 / 316 & Aluminium Bronze
Shaft support bearings Stainless Steel 440
In-vacuum D-sub connector Unfilled PEEK (housing) & Stainless Steel fittings
In vacuum feed-through connector Unfilled PEEK (housing) & Stainless Steel fittings
Limit switch feed-through Stainless Steel & Glass ceramic
V3F Limit switches
PPS (housing), Ceramic (plunger), silver (contacts) & Stainless steel fittings
Drive Tubes Stainless Steel 304 / 316
Bellows components (LSM64) Stainless Steel 316
Sealing Gaskets Copper
Rotary drive bearings Stainless Steel 440 Molybdenum disulfide coated
Rotary drive magnets Cobalt / Samarium
Rotary drive magnet holders elements Aluminium HE30
Rotary drive flange & body tubes Stainless Steel 316
Fittings, rings & pins Stainless Steel 316 / 304
Wiring As specified in wiring diagrams
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UHV DESIGN LTD
JUDGES HOUSE
LEWES ROAD
LAUGHTON
UNITED KINGDOM
BN8 6BN
TEL: +44 (0)1323 811188
www.uhvdesign.com
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