Steel bushing. H7 reamed hole and keyway in compliance with DIN 6885/1 P9 tolerance for dimension K10 and in compliance with DIN 6885/2 P9 tolerance for dimension K14. Assembly to the spindle by means of a keyway or a transversal pin.
<P>Black-oxide steel. Assembly by means of three holes for M5 countersunk head screws.</P>
|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.<BR>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).<BR>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.<BR>60 teeth provide 2, 3, 4, 5, 6, 10, 12, 15, 20 and 30 precise divisions.<BR>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 GN 215 indexing levers.
Black-oxide steel.<BR>- Execution <STRONG>A</STRONG>: knurled surface.<BR>- Execution <STRONG>AS</STRONG>: matte chrome-plated steel external body with laser-engraved precision flange (scale 0 …50, 60 graduations).<BR>- Execution <STRONG>B</STRONG>: smooth surface, with lever arm and cylindrical handle type I.280 in phenolic based (PF) Duroplast, black colour, glossy finish. Resistant to solvents, oils, greases and other chemical agents.<BR>- Execution <STRONG>C</STRONG>: indexing mechanisms with two arms.
|Types of mounting||
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).<BR>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.