A question regarding rapid traverse and accuracy..

I think I used feed all the time when I was machining...........just did not like to see that 800 x 400 bed whizzing along in rapid when it was not really necessary.......but then again I was not money made production oriented.

dj (Makino FNC80 - deceased)

Vinny:

I would speculate that they are talking about machines that make "dogleg" rapid moves. Where, for instance, if you're rapiding from X0, Y0, to X20 Y10 and both axes of the table move at the maximum speed rate (assuming the max rate is the same on both axes), would end up with the table going in a 45 degree angle to X10, Y10, first - THEN it would continue to move the rest of the way only in X until it reached X20.

That's one of the things that the Fanuc 31i control can do. I don't know about other Fanucs.

Bob,

Never used the fadal version we always just did it with manual edits.

Yep. Look in the parameter manual for the setting called "G00 SLOPE CONSTANT"

Kirk Gordon wrote in news: snipped-for-privacy@gordon-eng2.com:

Virtually any Siemens control. I haven't check the 840D's, but I would believe they are the same, Siemens doesn't change philosophy much on parameter settings and adjustments. I also am pretty positive that Mazak has separate in-position check tolerances. I don't know about fanucked, I try to stay away from them all I can.

Half-nutz wrote in news:0e74c0af-8745-4cd4-837c- snipped-for-privacy@59g2000hsb.googlegroups.com:

Either that, or change the accuracy window parameter. This may result in jerkiness though.

Depends on the control but most can be so configured.

"John R. Carroll" wrote in news:jybKj.111$ snipped-for-privacy@newssvr13.news.prodigy.net:

I figured as much. The params on all controls are about the same, just named different or something. The design requirements and input parameters won't change because of control brand, that's determined by the application.

They may have different tracking error tolerances, to allow actual position to lag farther behind intended position during fastr moves; but I think you're mistaken about the in-position values. What would be the point of having a machine that could position within, say, half a tenth when feeding; but only be within two tenths when rapid positioning? Or vise versa? Are you supposed to stop rapid movement early, and feed to position when you want to bore a hole in the right place??

KG

Exactly correct.

Kirk, they have fine and coarse in-position windows thatcan be called via G code same as Fanuc just different terms, same ole blah blah. Daveb