Model 308

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Vishay Spectrol

Revision: 27-Mar-15

2

Document Number: 57058

For technical questions, contact: sferprecisionpot@vishay.com

THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT

ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000

DIMENSIONS in inches (millimeters)

MECHANICAL SPECIFICATIONS

PARAMETER

Rotation

360° (continuous)

Bearing type



Servo mount:



Bushing mount:

Ball bearing

Sleeve bearing

Ganging

6 sections maximum. Terminal alignment, added sections, within ± 10° of section 1 terminals

Torque (maximums)



Mounting



Servo, 1 section



Bushing, 1 section



Each additional section

STARTING

1.0 oz. - in (72.00 g - cm)

1.7 oz. - in (122.40 g - cm)

0.6 oz. - in (43.20 g - cm)

RUNNING

0.5 oz. - in (36.00 g - cm)

1.0 oz. - in (72.00 g - cm)

0.4 oz. - in (28.80 g - cm)

Runouts (maximums)



Shaft (TIR/in)



Pilot dia. (TIR)



Lateral (TIR)



Shaft end Play



Shaft Radial play

SERVO

0.002" (0.05 cm)

0.002" (0.05 cm)

0.003" (0.08 cm)

0.005" (0.13 cm)

0.002" (0.05 cm)

BUSHING

0.002" (0.05 cm)

0.002" (0.05 cm)

0.005" (0.13 cm)

0.005" (0.13 cm)

0.003" (0.08 cm)

Moment of inertia

2.0 g - cm2 per section maximum

Weight



Single section



Each additional section

4.0 oz. (127.57 g)

1.2 oz. (34.02 g)

0.831

(21.10)

± 0.010

0.625

(15.88)

± 0.031

0.073 MIN.

(1.85)

Ø 2.000

(50.80)

Ø 1.8750

(47.62)

+ 0.0000

- 0.0005

Ø 0.2497

(6.34)

+ 0.0000

- 0.0003

0.062

(1.57)

MTG. FACE

Ø 2.000

(50.80)

± 0.015

Ø 1.812

MAX.

(46.02)

0.093

(2.36)

0.340 MIN.

(8.64)

15° TYP.

45°

± 5°

3

1

2

1.200 R MAX.

(30.48)

1.140 R MAX.

(28.96)

SERVO MOUNT: 308S/308-2

BUSHING MOUNT: 308B/308-1

Ø 2.000

(50.80)

± 0.015

Ø 1.375

(34.92)

± 0.015

Ø 0.4062

(10.32)

+ 0.0000

- 0.0010

3/

8 - 32 UNEF - 2A

MTG. FACE

0.010

(0.25)

0.239 MIN.

(6.07)

0.705

(17.91)

± 0.015

0.875

(22.22)

± 0.031

0.375

(9.52)

± 0.010

0.062

(1.57)

Ø 0.2497

(6.34)

+ 0.0000

- 0.0003

1

ADD 0.500 ± 0.002 (12.70) FOR EACH

ADDITIONAL SECTION

TOLERANCES: UNLESS OTHERWISE NOTED.

DECIMALS ± 0.005 ANGLES ± 2°

CW

SCHEMATIC

2

3

1

1

1