Ok s I have spent the better part of a year converting my mill to CNC, and sucess 3 weeks ago as it moved for the first time.
I had lots of problems during the conversion that were just unfortunate but hey ho I got there in the end, with pure bloody mindedness and the help of the good folks over at CNCzone.
So now I have a problem, I have DTI'd the X and the Y axis and found that I have backlash on my new ballscrews (bugger!) the x is .2 and the y is .22
When I cut a circle I have a verry small flat on the circle, sadly even with backlash comp on (at least this time its only one side).
Hence the question about steps per...could this be the problem...I only ask as got my current figure by trail and error (160)
The ballscrews are supposed to be 5mm but as I bought them from china direct I think I have some problems with pitch they seem to measure 5.4, unless my digital calipers are broken.
Ok so 5mm pitch. 200 revs of the motor, direct drive no blets or gearing. 16 microsteps. can anyone who is better at math than I confirm that htis should be 160. Any other possiblites that could explain why i have one flat side one a circle.
Thanks for any help.
Andy