Shifting The Drive Belt; Direction Of Rotation Switch; Service And Maintenance - Proxxon PD 400 CNC-ready Commissioning Manual

8.8. Shifting the drive belt

The spindle speed can be changed by shifting the motor (multiple contact switch 1 Fig.
4). The speed is halved or doubled. On the other hand, the speed can be changed by
shifting the drive belt in the spindle box at the left.
1. Switch off the CNC control at the mains
switch and open the gear case with the
Allen key.
2. Loosen clamping screw 1 by ½ a turn.
3. Use the Allen key 2 to turn screw 3 to
the left. This releases the intermediate
belt pulley 4.
4. Now change the belt according to the
graphic shown below.
5. Use the Allen key 2 to turn screw 3 to
the right to tension the belt again.
6. Remove Allen key 2 and tighten
clamping screw 1.
7. Close the gear case and put the
machine into operation.

8.1. Direction of rotation switch

Your CNC machine no longer has a separate mains switch
as it is controlled directly via control electronics.
However, during normal work, make sure that the direction
of rotation switch of the machine (shown in the figure on
the right) is not in the "0" setting, but is set to the desired
direction of rotation.
Otherwise the machine will not start.
That is why it also may not be set to "0" during a machining
procedure, as the spindle movement will be interrupted.

9. Service and Maintenance

Attention!
During all maintenance and cleaning work, make sure that the machine cannot start
up accidentally!
If necessary, make sure that the mains cable is disconnected from the control unit and
that the direction of rotation switch (see page 15) is in the middle position "0".
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