New user - Last week my machine was very inaccurate after recently being assembled, thanks for the talkshopbot support. The problem was that the pinions were not tight and then when tightened they loosened again and needed threadlock and had to be tightened again. (Should be added to assembly manual.)

I'm not sure the machine is accurate still. Making two drill holes 18mm/50mm/2000mm apart all seem to be very accurate, but profiling or pocketing a box 18mm x 50mm does not fit a 50mm x 50mm x 18mm part into it. Tried drawing the rectangle at 18.4mm and still too tight where the cut is just below 17.9mm. I need to draw it as 18.8mm x 50.8mm to fit it. Is this normal or is something still wrong? Any ideas?