Inaccurate x axis

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ajbonu02
Posts: 2
Joined: Sun Oct 18, 2020 2:41 pm

Inaccurate x axis

Post by ajbonu02 » Sun Nov 20, 2022 10:26 am

Hello,
I'm running buildbotics on a openbuild lead cnc 1010 and am having trouble getting acceptable accuracy on the x axis. For instance, if I enter the proper travel per rev for x axis (8mm, based on an 8mm 4-start lead screw), a 350mm g0 move will be 355 mm or more in actual travel. I've tried to adjust using the calibration method outlined in your video, but can not get it to be dead-on accurate. The y-axis, which has identical lead screw (travel per rev set to 8mm), appears to work properly.

Is there something I'm doing wrong? I'm running 1.0.3 of the firmware...is it possible that there is a bug in the software?

Thanks for any help you can provide!

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Doug
Posts: 320
Joined: Fri Feb 02, 2018 4:56 pm

Re: Inaccurate x axis

Post by Doug » Sun Nov 20, 2022 9:41 pm

What are the max velocity, max acceleration, and max jerk settings for the axis?

ajbonu02
Posts: 2
Joined: Sun Oct 18, 2020 2:41 pm

Re: Inaccurate x axis

Post by ajbonu02 » Sat Dec 03, 2022 11:41 am

Sorry it's taken me so long to reply! I had to tear the machine apart and make a few adjustments.

The settings feel pretty conservative: max velocity is 3m/min, accel is 5.2km/min, and max jerk is 50. I've been doing test runs with a ruler, and it's always at least a few mm too long.

This is the type of machine I'm using:
https://openbuildspartstore.com/lead-cnc-1010-40-x-40/

Thanks again for your assistance!

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