Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: Tiwanacote on March 18, 2010, 08:08:36 PM
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Hi!!! When I use 3 axis everything goes good and not jerk movements and vibrations appear using "Constant Velocity" for angles > 170°. When I use rotary axis and Z axis working at the same time it goes bad, It seems to be working with "exact stop" setting. ¿What is the problem????? I tried to change 4th acceleration settings and nothing got better.
Regards
Tiwanacote
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Hi, Same problem as I have... Any idees ?
/R
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I pasted what Mach support answered me
Tiwanacote
----- Original Message -----
From: Maxi Bertotto
To: support@machsupport.com
Sent: Friday, March 19, 2010 9:28 PM
Subject: Question
Mach takes the 4th axis into account for CV mode ?
Thank you!!
Hello Maxi,
Yes, it should... ;-)
Thanks,
scott
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Scott Nichols
License Manager
www.machsupport.com
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I believe you may be seeing the effects of a long-standing bug in Mach3. If you have two axes in-motion, and then transition to a 3-axis move, the acceleration setting of that third axis will be ignored, and it will be expected (more like required) to accelerate at the same rate as X/Y. This can be easily demonstrated by setting your Z axis accleration to a very low value, as compared to X and Y, then doing a move that transitions to a helical move in X/Y/Z. The Z axis will lose position at the entry to the 3-axis move. This is a known problem, and will be fixed someday, but it's not high on the priority list. This gave me fits when my mill was capable of 3-- IPM on X & Y, but only 50 IPM on Z. At present, the only work-around is to run in Exact Stop mode. It would not surprise me a bit if there were a related problem occurring when moving a rotary axis in concert with linear axes.
Regards,
Ray L.
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Thank you for your info Ray!