Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: PeteG on May 21, 2020, 01:55:37 PM

Title: Constant velocity vs Exact stop
Post by: PeteG on May 21, 2020, 01:55:37 PM

So, I am once again confused. I have been running my machine in constant velocity mode, which seems to be the default. I had a little issue with corners rounding off and corrected this by altering the acceleration and deceleration settings.

Then I saw a YouTube vid which introduced me to the wonders of ‘exact stop’. This works well and creates really sharp corners but is a bit weird when cutting circles. So I tried the option to turn off CV on an angle greater than 89 degrees. I assumed that this would make the machine run in CV mode until it encountered a 90-degree corner and would switch to exact stop mode. But it doesn’t. No matter what angle is set, it stays in CV mode.

What am I doing wrong?

Title: Re: Constant velocity vs Exact stop
Post by: Graham Waterworth on May 24, 2020, 08:29:46 PM

If its just an odd corner add a G61 before the corner and a G64 after the corner in the code or slow the feed down on the entry to the corner.