Gentlemen, I found the problem with the motion on the G&L W axis (X table carrier - this would be the Y axis on a vertical mill). Problem review - on a 10 inch command the W axis display would complete the motion but the table would still have about 3 inches to move. The table would complete the move to an accurate location but the control display would have completed and no change of the display would occur during the completion of the axis motion. Interesting - no?! This machine uses resolver feedback to the servo amplifier. Scale feedback and encoder feedback to the control. If anything this triple position feedback should nail table position without question. I swapped the servo amplifiers to see if the problem moved with the amp. The problem stayed with the table. So far so good. It took a few days thinking but I compared the ini file parameters (X and W). The output scale was the only difference. The W output scale value was 1 - I changed it to .56 to match the X value - voila - problem solved. I have a strange jump in the halscope feedback for the W axis. I think it is ball screw lost motion. Since I cannot use the scale for the Y axis I have found the Y axis has .013 lost motion in the ball screw. I will disable scale feedback for the W and check what the lost motion is. I will also be determining where the lost motion is for the Y axis. I intend to swap the Z and W axes. The Z is currently the quill. I want the quill to be W and the table to be Z. having some fun now thanks Stuart
-- The value of goods are expressed in money, while the value of money is expressed in goods. Money and goods are clearly not the same things, but are exactly opposite things. Goods are wealth which you have, while money is a claim on wealth which you do not have. Goods are an asset; Money is a debt. If goods are wealth; money is clearly not wealth, it is negative wealth, maybe even anti-wealth. – Quigley, Tragedy and Hope, pg. 44 (emphasis added) ------------------------------------------------------------------------------ Throughout its 18-year history, RSA Conference consistently attracts the world's best and brightest in the field, creating opportunities for Conference attendees to learn about information security's most important issues through interactions with peers, luminaries and emerging and established companies. http://p.sf.net/sfu/rsaconf-dev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
