I've been running my Bridgeport Interact II with Geckos and Mach 3 for a couple years. ?Thot I had it pretty "dialed in" - motor tuning set very close to 20000. Yesterday I started a job that drilled a hole at 0,0, moved and drilled holes at (+/-X,0) and (0,+/-Y) then returned to 0,0 to start another part of the job. ?Even though MACH says I'm back at 0,0,0, the tool was visually off. ?I recentered and it appears to have been off at least in X by 0.033", Y.. maybe 0.005 ish. After recentering (visually) I cut a circle, which cut within about 0.001" dia, and that's with no backlash compensation in MACH.

Need help understanding this...?

Missing steps? - rapids were only like 15 ipm, "sounded good" while moving, I was VERY surprised to literally see it noticeably off center.

Backlash? - seems good based on the circle I cut

What am I missing??

THANKS!

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I've been running my Bridgeport Interact II with Geckos and Mach 3 for a couple years. ?Thot I had it pretty "dialed in" - motor tuning set very close to 20000. Yesterday I started a job that drilled a hole at 0,0, moved and drilled holes at (+/-X,0) and (0,+/-Y) then returned to 0,0 to start another part of the job. ?Even though MACH says I'm back at 0,0,0, the tool was visually off. ?I recentered and it appears to have been off at least in X by 0.033", Y.. maybe 0.005 ish. After recentering (visually) I cut a circle, which cut within about 0.001" dia, and that's with no backlash compensation in MACH.

Need help understanding this...?

Missing steps? - rapids were only like 15 ipm, "sounded good" while moving, I was VERY surprised to literally see it noticeably off center.

Backlash? - seems good based on the circle I cut