Helical Help

Apr 23, 2008 7 Replies
D

I am trying to machine some wavy grooves around a cylinder (see Fanuc



21i operation manual on G07.1 for a pretty close example). From all my testing I have determined that the C axis is not in sync with the Z axis during cutting moves. It appears that the C axis delays movement at the start of a move by about 1 degree for a 45 degree ZC move.

It then tracks OK at this 1 degree lag. Then when a line of code comes in which there is no C move (C axis stationary) the C axis kind of jumps to where it should be. Thus, suddenly making up that 1 degree lag at the end of its move.



Any ideas?



Thanks in advance Daveb


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C

Oh come on, what are you complaining about. At least it catches up...

ca

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J

Have you looked at how you are commanding the feed rates?

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D

I dont have the code yet (customers) I will post it when I do.

Thanks John Daveb

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O

Make sure and pay attention as to where and exactly how the code activates any C axis angular offset (and/or any transitional calls machine to local sys)....better yet, suggest always endeavor to keep ANY rotary axis offset set at zero unless you have some pre-existing feature in the part needs to be hard tooled/ and physically tWeeKed KnocKed HammErd bAngeD into pOsition.

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D

"over a barrel" wrote in news:PJmdnTEdd_lepI3VnZ2dnUVZ snipped-for-privacy@scnresearch.com:

Could be a backlash issue or a backlash parameter set improperly as well.

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