Model 128

Precision Potentiometer

Vishay Spectrol

Document Number: 57037

For technical questions, contact: sfer@vishay.com

www.vishay.com

Revision: 04-Jul-07

33

DIMENSIONS in inches (millimeters)

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)

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: 128 B

SERVO MOUNT: 128 S

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

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