Model 128

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Vishay Spectrol

Revision: 27-Mar-15

2

Document Number: 57037

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

Ball bearing

BUSHING MOUNT

Sleeve bearing

Torque (maximum)



Servo, 1 section



Bushing, 1 section



Each Additional Section

STARTING

0.25 oz. - in (18.0 g - cm)

0.30 oz. - in (21.6 g - cm)

0.20 oz. - in (14.4 g - cm)

RUNNING

0.15 o.z - in (10.8 g - cm)

0.25 oz. - in (18.0 g - cm)

0.15 oz. - in (10.8 g - cm)

Mechanical runouts (maximum)



Shaft runout (TIR/in)



Pilot dia. runout (TIR/in)



Lateral runout (TIR)



Shaft end play



Shaft radial play

SERVO

0.002" (0.05 mm)

0.002" (0.05 mm)

0.002" (0.05 mm)

0.005" (0.13 mm)

0.002" (0.05 mm)

BUSHING

0.002" (0.05 mm)

0.002" (0.05 mm)

0.005" (0.13 mm)

0.005" (0.13 mm)

0.003" (0.08 mm)

Weight (maximum):



Single section



Each additional section

0.8 oz. (22.7 g)

0.4 oz. (11.3 g)

Ganging

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

Moment of inertia

0.12 g - cm2 per section maximum

0.687

(17.45)

± 0.010

0.875

(22.22)

± 0.031

0.375

(9.52)

± 0.015

Ø 0.1248

(3.17)

+ 0.0000

- 0.0003

Ø 0.4062

(10.32)

+ 0.0000

- 0.0010

MTG. FACE

Ø 1.062

(26.97)

± 0.015

0.062

(1.57)

0.308 MIN.

(7.82)

3/

8 32 UNEF - 2A

30°

TYP.

1

3

2

R 0.735 MAX.

(18.67)

0.500

(12.70)

± 0.031

0.062

(1.57)

0.062

(1.57)

0.062

(1.57)

Ø 0.9688

(24.61)

+ 0.0000

- 0.0005

Ø 1.062

(26.97)

Ø 0.1248

(3.17)

+ 0.0000

- 0.0003

MTG. FACE

Ø 0.968 MAX.

(24.58)

Ø 1.062

(26.97)

± 0.015

0.308 MIN.

(7.82)

BUSHING MOUNT: 128B/128-1...

SERVO MOUNT: 128S/128-2...

1

ADD 0.782 ± 0.002 (19.86) FOR EACH

ADDITIONAL SECTION

TOLERANCES: UNLESS OTHERWISE NOTED.

DECIMALS ± 0.005 ANGLES ± 2°

CW

SCHEMATIC

2

3

1

1