GN 200-A

Indexing mechanisms with stop and positioning device

Black-oxide steel base and knob, without lever arm

Features and instructions

The knob encloses a small mechanism which allows small rotation movements (6° or multiples) and the resulting movement and positioning of machine parts.

In rest position, the internal toothing of the knob (60 teeth) is connected simultaneously to the external toothing of the base (fixed) and to the toothing of the bushing (attached to the spindle).

To move the spindle, the knob must be disengaged from the base toothing by pulling or lifting it, applying a force against the spring in the direction of the axis. The external toothing keeps the connection between the knob and the spindle during rotation.

60 teeth provide 2, 3, 4, 5, 6, 10, 12, 15, 20 and 30 precise divisions.

If high torque is required to turn the spindle, problems may arise when engaging and releasing the toothing due to the limited clearance of the walls or the friction of the teeth. In this case, it is recommended to use indexing levers type GN 125.

Assembly modes

GN 200 indexing mechanisms with stop and positioning device can be built also to perform a spindle rotation and a lock of it in a given number of positions. For this purpose, a projecting pin inserted into the base allows the toothing to be re-engaged only when the pin is in contact with the corresponding holes in the knob (example 2).

The hole can also be drilled with a certain clearance since the main function of the pin is to stop the movement, while the lock is provided by the toothing engagement.

 

 

Special executions on request

• Laser-engraved precision graduations (see Graduations).

• Chrome-plated matte finish.

• Indexing mechanisms with two arms.