https://forums.autodesk.com/t5/fusion-manufacture-forum/help-fusion-amp-grbl-be-happy-friends/m-p/5810914#M163879 <P>The G28 shouldn't make any difference. Can you test the same part using Cambam and Fusion, it would be interesting to see if there are any obvious differences.</P> <P>&nbsp;</P> <P>Here's a couple of screen shots of what I think is the problem area, the first shows a very short helical move, the next image show a line move. All around the ramp you have the same short helical&nbsp;move then a line, this might be whats causing your control problems.</P> <P><IMG src="https://forums.autodesk.com/t5/image/serverpage/image-id/188035i9500DB87B72D483B/image-size/original?v=mpbl-1&amp;px=-1" border="0" alt="Clipboard01.png" title="Clipboard01.png" /></P> <P>&nbsp;</P> <P><IMG src="https://forums.autodesk.com/t5/image/serverpage/image-id/188036iA753E6BEE520AB02/image-size/original?v=mpbl-1&amp;px=-1" border="0" alt="Clipboard02.png" title="Clipboard02.png" /></P> <P>&nbsp;</P> <P>The feed in the g code is constant so it must be the way the control is processing the g code. I don't know if there's a setting that will give all line moves for the ramp, that might be better than the short arcs and lines.</P> <P>&nbsp;</P> <P>Mark</P> Thu, 10 Sep 2015 13:34:16 GMT HughesTooling 2015-09-10T13:34:16Z