Instrument Drives

Instrument Drives

The table illustrates the drives which are supplied at the time of ordering. Drives with a 1:2 ratio are only used when the input speed for full scale deflection is below 250 RPM.

Description

 

Input axis relative to pointer axis

 

LH or RH Offset

 

Connection

 

Non reversing or reversing

 

Input drive to instrument drive ratio

 

Flex drive end

 

Concentric

 

 

 

1.1/4” x 20 TPI union nut

 

 

 

1:1

 

Extended spindle

 

Concentric

 

 

 

7 mm Dia spindle x 32 mm long

 

 

 

 

1:1

 

Angle drive (ADI)

 

90 degree offset

 

LH

 

1.1/4” x 20 TPI union nut

 

Non Rev

 

1:1

 

1:2

 

 

 

 

 

 

 

 

Reversing

 

1:1

 

1:2

 

 

 

 

 

 

7 mm Dia spindle x 32 mm long

 

 

Non Rev

 

1:1

 

1:2

 

 

 

 

 

 

 

 

Reversing

 

1:1

 

1:2

 

 

 

 

RH

 

1.1/4” x 20 TPI union nut

 

Non Rev

 

1:1

 

1:2

 

 

 

 

 

 

 

 

Reversing

 

1:1

 

1:2

 

 

 

 

 

 

7 mm Dia spindle x 32 mm long

 

 

Non Rev

 

1:1

 

1:2

 

 

 

 

 

 

 

 

Reversing

 

1:1

 

1:2

INSTRUMENT DRIVES

Flex Drive End: 1.1/4 x 20 TPI Union Nut with 3.70 mm Male Square Drive.

Extended Spindle: 7 mm Dia. shaft x 32 mm long suitable for pulley or spring coupling (see accessories).

Angle drive (Code AD1) Clamps to back of instrument, has 1.1/4” x 20 TPI male thread to take flex drive