Machsupport Forum
G-Code, CAD, and CAM => G-Code, CAD, and CAM discussions => Topic started by: Sailor10 on August 24, 2020, 09:38:21 PM
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I read in your manual, much after I sent the request that G61 and G64 can be used. One turns CV on the other Turns exact move on.
My problem that caused the inquiry is: On a clock face that is about 11 inches in diameter, I inscribe two circles out at about 10.25 and 10.5 inches in diameter, between them I inscribe the minute and hour marks, 48-minute marks which are shorter and 12-hour marks which extend from the inner circle to the outer circle. In the first quadrant +, between 1 and 4 the marks are almost parallel to the line between the center and the 3. In the last quadrant between 9 and 12 the form a crescent shape.
I am trying to determine why this is happening as I can't cut clock faces with funny looking minute and hour markers. It does not appear that I am losing steps as the end of the cut ends exactly at the beginning.
As CV is the default, I cut my speed down from 80 in/sec to 25, thinking it was rounding the last of the cut. (didn't make a lot of sense as half of the cuts were fine.) but worth a try.
Any suggestions would be appreciated.
Regards,
Ken Hall
Quad 1.jpg
Quad 3.jpg
Quad 4.jpg
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It appears that CV is causing the issue and to confirm this run the same file in Exact Stop mode ( G61 ).
If this resolves the issue then your motor tuning should be adjusted to increase the Acceleration and reduce the Velocity for both the X and Y axes (saving the changes). Do this in stages until you obtain acceptable results when running in CV mode ( G64 ).
Tweakie.
EDIT; There is more information of how CV affects the toolpath in David Bloomfield's .pdf file which can be downloaded from here; https://www.machsupport.com/forum/index.php?topic=7923.0