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Cutting Off Size

[email protected] All Messages By This Member #153892 I have a 3 axis router (dual X) running ballscrews. It has work fine for a few years now, but started to cut off-size, and in consistant Doing a steps/mm check over 1m, and accuracy is better than 0.5mm - This is repeatable However, when I try to cut simple squares 25mm, they measure 25.6 If I do parrallel cuts at 25mm spacing, some are 24 some are 26 (almost like every second cut is offset by 1mm) Re-test the 1m and still accurate. This is new, and Im totally confused ! Can anyone help please Thanks Drew
Henrik Olsson All Messages By This Member #153893 Check everything mechanical between the motor and tool. Shaft couplers, belt pulleys, belt tension, ballnut mount, bearing blocks. Perhaps the the shaftcoupler is slipping or the ballscrew isn't held in place axially. /Henrik. 8 december 2019 10:16:12 +01:00, skrev agpearce@...: toggle quoted message Show quoted text I have a 3 axis router (dual X) running ballscrews. It has work fine for a few years now, but started to cut off-size, and in consistant Doing a steps/mm check over 1m, and accuracy is better than 0.5mm - This is repeatable However, when I try to cut simple squares 25mm, they measure 25.6 If I do parrallel cuts at 25mm spacing, some are 24 some are 26 (almost like every second cut is offset by 1mm) Re-test the 1m and still accurate. This is new, and Im totally confused ! Can anyone help please Thanks Drew
Chuck Hackett All Messages By This Member #153895 开云体育 If you use the MDI screen, set relative mode and use repeated G1 (x or y) 0.5 (mm). ? Does it advance .5 mm each time as show on a dial gauge? ? Cheers, ? Chuck Hackett "Good judgment comes from experience, experience comes from bad judgment" 7.5" gauge Union Pacific Northern (4-8-4) 844 ? ? ? toggle quoted message Show quoted text From: [email protected] <[email protected]> On Behalf Of agpearce@... Sent: Sunday, December 8, 2019 4:16 AM To: [email protected] Subject: [MachCNC] Cutting Off Size ? I have a 3 axis router (dual X) running ballscrews. It has work fine for a few years now, but started to cut off-size, and in consistant Doing a steps/mm check over 1m, and accuracy is better than 0.5mm - This is repeatable However, when I try to cut simple squares 25mm, they measure 25.6 If I do parrallel cuts at 25mm spacing, some are 24 some are 26 (almost like every second cut is offset by 1mm) Re-test the 1m and still accurate. This is new, and Im totally confused ! Can anyone help please Thanks Drew
[email protected] All Messages By This Member #153897 All solid Also, whatever the error is, it is on BOTH X & Y axis. Almost like there is a scaling factor somewhere

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