Hey guys,
I've got a problem with my DIY cnc router.
The machine is a dual-x AC servo driven machine on module 1 R&P with 8:1 reduction gearboxes, on a 50mm PCD pinion.
This corresponds to ~157mm of linear travel per output revolution.
However, with the X axis I am having a problem.
The motion when the gears are not engaged, i.e. the pinion is disengaged from the rack is extremely smooth.
When the gear and rack ARE engaged, the motion is choppy and vibrates quite significantly, even when moving very slow. This translates to odd artefacts appearing on the work piece.
The problem does not exist with the motors or gearbox, as the Y axis uses an identical system (albeit only a single motor), and the motion is very smooth.
The X does make some odd noises. The only way to describe it is that it sounds like car wheels that have a very high rolling resistance - this constant frictional noise.
Has anyone encountered this before? or know of solutions/causes?
Please see attached pictures to get a clearer idea of the situation (and ignore the junk in the background too :P).