chap 7 selection procedure for bearing

CHAPTER 7SELECTION

PROCEDURE FOR BEARING

MISSAM RAZA Dept. -Mechanical LJ Polytechnic

NORTHNORTH0º0º

NORTH EASTNORTH EAST045º045º


NORTHNORTH0º0º

NORTH EASTNORTH EAST045º045º

SUDHIR PATEL L.J.

POLYTECHNIC,A'BADMISSAM RAZA Dept. -Mechanical LJ Polytechnic

NORTHNORTH0º0º

NORTH NORTH WESTWEST315º315º


1. Measured from North.

2. In a clockwise direction.3. Written as 3 figures.

N

S

EW

N

S

EW

N

S

EW

060o

145o230o

315o

60o

145o

230o 315o

Bearings

N

S

EW 090o

360/000o

270o

180o


Bearings

N

S

EW 090o

360/000o

270o

180o

A protractor is used to

measure bearings.

SE

135o

SW

225o

NW

315o

NE

045o

Worksheet 1MISSAM RAZA Dept. -Mechanical LJ

Polytechnic

360/000o

090o

180o

270oW E

N

S

Estimate the bearing of each aircraft from

the centre of the radar screen.030o

075o

045o

200o

135o

330o

225o

290o

110o250o

315o

170o


360/000o

090o

180o

270oW E

N

S

1

2

10 9

8

4

7

6

53

040o

250o

280o

120o

195o

010o

325o

155o

235o

Bearings

Measuring the bearing of one point from another.

1. Draw a straight line between both points.2. Draw a North line at A.

3. Measure the angle between.

N060o

To Find the bearing of B from A.

B

A

Worksheet 3MISSAM RAZA Dept. -Mechanical LJ Polytechnic

Bearings


1. Draw a straight line between both points.2. Draw a North line at B.

3. Measure angle between (a take from 360).

N

240o

To Find the bearing of A from B.

B

A


Bearings


N060o

B

A

N

240oHow are the bearings of A and B from each other related and why?


Bearings


1. Draw a straight line between both points.2. Draw a North line at P.

3. Measure angle between.

N

P

Q

To Find the bearing of Q from P.

118o


Bearings


1. Draw a straight line between both points.2. Draw a North line at Q.

3. Measure angle between (take from 360).

N

P

Q

To Find the bearing of P from Q.

298o


Bearings


N

P

Q

118o

N

298o

How are the bearings of A and B from each

other related and why? Worksheet 3


A1. 2. 3.

4. 5. 6

D S

M

P

V

W

Q

T

N

B C

Bear ingsBearings are M easured1. From N orth2. Clockw ise3. Using 3 figures

Find the b e a ring s o f the fo llo w ing :1 . A fro m B 4 . M fro m N2. C fro m D 5 . P fro m Q3. T fro m S 6 . V fro m W

N030

060

090

120

150

180

210

240

270

300

330

360/000

W E

S


Bearings : Fixing Position

Trainee pilots have to to learn to cope when the unexpected happens. If their navigation equipment fails they can quickly find their position by calling controllers at two different airfields for a bearing. The two bearings will tell the pilot where he is. The initial call on the controllers radio frequency will trigger a line on the radar screen showing the bearing of the calling aircraft.

Airfield (A)283.2 MHZ UHF

Airfield (B)

306.7 MHZ UHF050o

300o

Thankyou


Bearings : Fixing Position

Trainee pilots have to to learn to be cope when the unexpected happens. If their navigation equipment fails they can quickly find their position by calling controllers at two different airfields for a bearing. The two bearings will tell the pilot where he is. The initial call on the controllers radio frequency will trigger a line on the radar screen showing the bearing of the calling aircraft.

Airfield (A)283.2 MHZ UHF

Airfield (B)

306.7 MHZ UHFThankyou

170o

255o


A

B

1. Find the position of a point C, if it is on a bearing of 045o from A and 290o from B.

C

2. Find the position of a point D if it is on a bearing of 120o from A and 215o from B.

DWorksheet 5MISSAM RAZA Dept. -Mechanical LJ

Polytechnic

Bearings

N

S

EW 090o

000/360o

270o

180o

Worksheet 1


My Estimated Bearing

True Bearin

gError

1

2

3

4

5

6

7

8

9

10

11

12

Total Error

Average Error

Worksheet 2 (Radar)


True Bearin

gError

1

2

3

4

5

6

7

8

9

10

11

12

Total Error

Average Error


Whiteboard PORTRAIT

Make a table like this


True Bearing Error

1

2

3

4

5

6

7

8

9

10

Total Error

Average Error


BearingsBearings

B

A

Q

P


A1. 2. 3.

4. 5. 6

D S

M

P

V

W

Q

T

N

B C

BearingsBearings are Measured1. From North2. Clockwise3. Using 3 figures

Find the bearings of the following:1. A from B 4. M from N2. C from D 5. P from Q3. T from S 6. V from W

N030

060

090

120

150

180

210

240

270

300

330

360/000

W E

S


A

B

1. Find the position of a point C, if it is on a bearing of 045o from A and 290o from B.

2. Find the position of a point D if it is on a bearing of 120o from A and 215o from B.

Worksheet 5MISSAM RAZA Dept. -Mechanical LJ

Polytechnic

Thrust ball bearing Thrust ancular contact ball bearing

Thrust cylindrical roller bearing

Thrust spherical roller bearing

Radial-Ball Bearings

Radial-Roller Bearings

Deep groove ball bearing

Ancular contact ball bearingSingle row douple row

Four point ball bearing

Self aligning ball bearing

Cylindrical roller bearing

Tapered roller

bearing

Barrel roller bearing

Spherical roller bearing

Bearing types


Radial load: good

Axial load: good

Alignment: dependent on the load, between 2‘ and 16‘

Limiting speed: high to very high

Remark: most widely used and reasonably price




Series: 60, 62, 63, 64,

160, 161, 618, 622, 623

Suffixes:

M solid brass cage

.2RS, .2RSR two seals

.W203B stainless steel

.2Z, .2ZR two shields


Sealed/Shielded Deep groove ball bearing


42B, 43B

Deep groove ball bearing, douple row


Radial load: good

Axial load: high in one direction

Alignment: very small

Limiting speed: high, spindle bearing very high

Remark: good for X, O and Tandemarrangement

Angular contact ball bearing


Angular contact ball bearing

Series: 72B, 73B

Suffixes:

MP solid window brass cage

TVP solid window polyamide cage

UA universal design, pairs have a small axial clearance

UO universal design, pairs have a zero clearance


Spindle bearingSeries: B719, B70, B72

HSS719, HSS70

Suffixes:

C contact angle 15°

E contact angle 25°

P4S tolerance class P4S

T solid window-type cage of textile laminated phenolic resin

UL universal design, pairs are lightly preloaded


Radial load: good

Axial load: high in both direction


Limiting speed: high

Angular contact ball bearing-douple row


Series: 32, 33 contact angle 35°

32B, 33B contact angle 25°

33DA contact angle 45°

Suffixes:

M machined brass cage

MA solid brass cage, outer ring guided

TVP solid window polyamide cage

TVH moulded snap type cage of glass-fibre reinforced polyamide

.2RSR two seals

.2ZR two shields

Angular contact ball bearing-douple row


Radial load: small

Axial load: high in both directions


Limiting speed: medium to high

Remark: inner ring split, large complement of balls




Series: QJ2, QJ3

Suffixes:

MPA machined window-type brass cage, outer ring guided

N2 two retaining grooves

TVP solid window-type cage of glass-fibre reinforced polyamide


Radial load: small

Axial load: small

Alignment: approx. 4°, sealed types up to 1,5°

Limiting speed: high Remark: insentive to misalignment and shaft deflection



Series: 10, 12, 13, 22, 23, 112

Suffixes:

K tapered bore


.2RS two seals

TV solid cage of glass-fibre reinforced polyamide



Radial load: very high

Axial load: none, small when bearings have lips

Alignment: very small, between 1‘ and 4‘


Remark: seperable, well suited for floating bearings



Series: NU2E, NU3E, NU10, NU19, NU22E, NU23E

Suffixes:

E maximum capacity design

M, M1 machined brass cage

TVP2 solid window-type cage of glass-fibre reinforced

polyamide




a

NUP N NJ u. HJ NU u. HJNU NJ



Axial load: none, lips can carry small thrust loads

Alignment: very low


Cylindrical roller bearing, douple row


Series: NN30,

NNU49

Suffixes:

S lubricating groove

K tapered bore


SP tolerance class SP, bearing clearance C1NA

Cylindrical roller bearing, douple row



Axial load: high in one direction, matched in both directions

Alignment: small 1‘ to 4‘

Limiting speed: medium to high

Remark: seperable, X and O-Arrangement possible

Tapered roller bearing


Series: 302, 303, 313, 320, 322, 323, 329, 330, 331, 332

Suffixes:

A changed internal design

A...N11CA axial clearance in µm, two X arranged bearings with

spacers between the cups

B increased contact angle

X outer dimensions adapted to international standards

Tapered roller bearing



Axial load: small

Alignment: very high, up to 4°

Limiting speed: low to medium

Remark: good for high loads and misalignment




Series: 202, 203

Suffixes:

K tapered bore

MB machined brass cage, inner ring guided

T solid window-type cage of glass-fibre reinforced

polyamide



Axial load: good

Alignment: good, between 0,5° to 2°

Limiting speed: low to medium

Remark: for heavy duty features, compensate misalignment



Spherical roller bearingSeries: 213, 222, 223, 230, 231,

232, 233, 239, 240, 241

Suffixes: A, B changed internal design

E maximum capacity design

K tapered bore


MA machined brass cage, outer ring guided

MB machined brass cage, inner ring guided

TVPB solid window-type cage of glass-fibre reinforced polyamide, inner ring

guided



MAA.MA.T41AB.MA

MBA.MBB.MB

EE.T41A

(YPB2)B(YPB2) B(JPB1)

EAS.M ES.TVPB



22332...22352A.MA.T41Az.B. 22340A.MA.J24BA.T41A

22308...22330E.T41Az.B. 22328E. J24BA.T41A

T41A = Restricted diameter tolerances and C4-Radial ClearanceJ24BA = Bore with Thin-Layer Chromium Plating


Radial load: none

Axial load: high

Alignment: none

Limiting speed: medium

Remark: spherical housing washers can compensate misalignment

Thrust ball bearing


Radial load: none

Axial load: high in both directions

Alignment: none

Limiting speed: medium

Remark: spherical housing washers can compensate misalignment

Thrust ball bearing-douple row


chap 7 selection procedure for bearing

Engineering

o worksheet

o missam raza

o bearings n s ew

o w e n s estimate

n o r t h

rin g s o f t h e f

mechanical lj polytechnic

n s ew n s ew n s ew