Not cutting square/flat bottom
I’m new to the world of cnc and have got a slight issue with my newly built workbee. I noticed when flatterning the bed that it wasn’t cutting true, eg, if I put it in a raster pattern (the start at centre and do a sqaure snail shell outward), where the cnc changed direction there would be a small ridge, so you would have 4 ridges that would go from the centre to the corners of the waste board. The worst one being bottom left if looking from above. If I tried a back and forth in the X direction, there is a very slight wedge left, thickest towards the front of the machine. If I lower the machine down to a spirit level and nudge close it I can see ever such a difference in distance in a 25mm diamter cutter from one side to the other (maybe less that 0.5mm).
I’ve just tried to cut a circle 70mm, 0.5 mm per pass, in some offcut oak, and this is the result. Spiral up cut bit from the ooznest kit, makita router, the center feels slightly domed up.
I’m not really sure where to start looking, I’ve tried the X/Y/Z wheels on the beams to check they are gripping etc. Any other photos or info I’m happy to provide.
Is this a good question?