Messages

1

General Mach Discussion / Re: Loosing Zero Reference on new CNC Mill

« on: December 17, 2011, 03:29:39 PM »

Thanks for all the advise and sorry to have taken so long to let you know how things turned out. The Mill was much better with an acceleration of 75. It would still loose zero sometimes but at least in general would reproduceably do multiple paths around a circle. I am looking now at upgrading the servo motors. Thanks again for all the help
Regards
Robert

2

General Mach Discussion / Re: Loosing Zero Reference on new CNC Mill

« on: November 06, 2011, 12:10:15 AM »

Thanks Ger21,

what would you suggest to lubricate with? Grease or silicon or oil?

Regards,
Robert

3

General Mach Discussion / Loosing Zero Reference on new CNC Mill

« on: November 05, 2011, 11:45:22 PM »

Hi All
I have just purchased a Chinese CNC Router 6040 ( http://www.ebay.com.au/itm/320774368487?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649 ). I have set-up a PC with Windows XP installed a licensed version of MACH3 and set-up as per the instructions provided with the router.
I downloaded the Scorpion from the download section of this forum. It seemed to cut fine until just near the end when the cutting line seemed to suddenly shift. I put on a new piece of board this time I drilled a hole at the (0,0) position the board. I ran the Scorpion again. When I got back to (0,0) I drilled another hole. The holes had shifted by 5mm in Y and 3 mm in X. Repeating this process multiple times the (0,0) point always shifts between 0.5mm and 40mm. Never the same amount twice.
I have tried the following
•   Turned off the steping motor controller and turned the two lead screws through their entire lengths. No tight spots felt
•   Changed the frequency from Kernel Speed from the recommended 35,000Hz to 25,000Hz. No difference still losing zero.
•   Halved the Motor Tuning Velocity & Acceleration parameters from the recommended 1200 & 300 to 750 and 150. It made no difference.
•   Went through the Windows XP tuning guide on the MACH3 support site and made all setting suggested. No difference.
I am at a loss to know what else to try. Any suggestions? Thanks
Regards
Robert