E.fric

precision friction drive mount

GTD have created a precision friction drive equatorial mount based on new concepts.

Here are the most important highlights and the technical sheet.

GTD E.fric tech sheet 1 04.2020

The mount can be separated in two parts by4pc easily accessible captive bolts (theycannot be lost). The tool for this is includedwith the delivery and is useful for locking themount at the desired elevation too.

The counterweight shaft rotates with the declination axis. You can use it tomount a second small telescope or balance in declination with off-axis bored counterweights, when sliding the OTA is not convenient for some reason.

The azimuth pin of your tripod can be ina wide range, not just exactly at theradius of the screws.

GTD E.fric tech sheet 2 04.2020

The central thread for locking the mount is a replaceable bushing, you can change between M10 and M12 for example.

The RA and DEC shafts are hollow so that you can route your cables to the OTA all internally.

There is an adapter foryour Polemaster camera

on the DEC head.

GTD E.fric tech sheet 3 04.2020

You can use any stepper driver you wish. Just load the reduction parameters and go. We recommend the On step controller. The drive parameters are engraved on the motor cover.No encoder input is needed.

Technical data sheet

GTD E.fric precision friction drive Equatorial Mount

Payload 30 kg

Weight 18 kg

Latitude range 16 – 65 degrees

Azimuth pin radius, from central locking R 54 – 84 mm

Azimuth pin diameter, height D: 8 – 14 mm, H:10 – 40 mm

Telescope interface Losmandy rail

Counterweight shaft diameter 30 mm

Reduction R:480, D:360

Motors Nema 17 bipolar stepper, 1,5A max

Tracking precision Better than 2” ptv for unlimited time

Pointing precision 0,1%

Slewing speed Max 5 deg/sec, driver dependent

Electronics Any bipolar stepper driver with 8 bitmicrostepping and at least 1A current

output.

GTD

Innovation and Service since 1996

GTD E.fric tech sheet 4 04.2020