Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: mancman4 on February 12, 2012, 06:24:25 AM

Title: Flat spot on circles
Post by: mancman4 on February 12, 2012, 06:24:25 AM

I have a problem when cutting circles about 25mm in diameter.

The problem is the circle has a small flat spot on one side.

I have tried slightly different size circles 20mm & 30mm and it appears on all of them.

I am using VCarvePro to generate my G Code to a Proxxon MF70 CNC controlled by Mach3.

Not sure whats causing it so any help is appreciated.

Thanks

Jason

Title: Re: Flat spot on circles
Post by: Hal on February 12, 2012, 09:08:24 AM

Check youp backlash. You may have a little more in that area of your table. The extreme would be some pitch error in your lead screw.

Hal

Title: Re: Flat spot on circles
Post by: mancman4 on February 12, 2012, 05:36:58 PM

Thanks for the reply Hal.

I'll check for backlash and see if that cures it.

Jason