Hi,
While I see this post has been dormant I am hoping you can steer me in the correct direction. I am seeing occasionally a loss of Z, in the .060" range.
I Zero the machine, move the spindle to 2.00" above, check with a 1x2x3 block (on the 2" edge) and looks fine. Run a couple of paths ( generated with Fusion 360) and I see roughly .060" clearance between the 1x2x3 block after moving the spindle to 2.0". The Collet is tight using torque wrench set at 50lbs (1/4" bit).
Remember the DRO is showing 2.0" so if I rezero the z-axis the DRO should never see anything above 2.0". Correct? That is not the case I see a value of 2.057" ish just as I hit the zero operation. See pictures below.
Its an AVIDCNC like, lot of the part are from AVID, the exception is the controller. I am using a ESS from the Boardroom, ClearPath Nema34 servo's and various PS. If I was suffering from noise I would expect to see it on all axis. I don't, I only see this in the Z-axis. Spindle rack is AVID and the Spindle is also from AVID. The Rack-Pinion is from AVID also.
Thanks
Loren
PS. I have simulated this and haven't seen it 'fail' using both NCViewer and the fusion built in version. the code is very simple, just taking .010 . off the side wall using a 2D contour. The main cut is a Pocket at .020in over and the Final Cut is Contour taking -.010in. Both paths has the Axial at 0.