deviation

[oliver4711]

Hi,
I'm using emc2 with my own built CNC and have the following problem:

I programmed a rectangle. When milling, the edges are no edges any more! the mill takes a shortcut and the edges are rounded. The mill does not break and drives around the edge with more or less full speed. I tried changing several values (accel, maax accel, stepgen max accel, output scale = input scale, Ferror...) but I don't get rid of this problem. programming lower speed is one solution which makes it better but tell the post to drive edges slower...

Any ideas?

regards Oliver

Similar Threads:

• Need Help!- Deviation when milling a circular pocket.
• Newbie- ~ 0.025 deviation in any length
• AL-02 Excessive speed deviation Fanuc
• CNC deviation error
• CNC deviation error

[vlmarshall]

Have you tried using G61 (exact stop)?
http://wiki.linuxcnc.org/cgi-bin/emc...1&id=GcodeInfo

[Heinz Reimer]

Or G64
http://www.linuxcnc.org/docview/html..._Concepts.html

[vlmarshall]

True, using G64 with a P-number will reduce the problem, and will still cut faster than using G61.

G64 (P=0) is on by default, and causes just what he's talking about; corners at full speed with no concern for accuracy.

[oliver4711]

Thank you, both works.

g64 p0.01 for 3d milling is very good. For 2d you can also use g61, but with 3d it stops at every point.

regards
Oliver