Just finished up my first router, which is based on SteveSpo's design.
(Thanks to SteveSpo and Clockwork for their invaluable help!)
It features 8020 aluminum & aluminum plate for the frame members, and the following parts:
HSCNC Rex ballcsrews w/ Zero-backlash ballnuts.
HSCNC Rex RS600 motors
THK KR33 for Z-axis
I'm using a PC 890 router along with a small Wolfgang Engineering mini-spindle for inlay work.
Pics to follow...
I just started some test cuts, and am having some accuracy issues.
I cut a simple square and a circle using a 1/4" router bit in my PC 890 router. The grooves measured a perfect 2.500, so the runout is pretty darn good on the new router...I had my doubts, but it tests out fine.
My issue is that the 3" square that I cut measures 2.950" instead of 3".
Looking at the G-code, it seems to be compensating properly for the bit thickness properly, and the dimensions make sense. Still, I'm off by -.05" on the circle size.
On a 1.5" circle, it measures 1.467" - slightly less error, but still pretty bad.
Any thoughts? Could this be ballscrews? Or perhaps I need to tweak the formula I created for velocity/steps etc? Am I missing some sort of setting in Mach?
My velocity settings in Mach 3 are as follows:
X - 10,000 steps, 100.02 ipm, acc = 50, step & dir both show 0.
Y - same as X
Z - 5,080 steps, 100.02 ipm, acc = 40, step & dir both show 0.
Any thoughts why I'm off by such a large amount? This is a very unacceptable error for my purposes.
Thanks for any help you kind folks can offer.