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IndustryArena Forum > Laser Engraving and Cutting Machines > General Laser Engraving / Cutting Machine Discussion > Y axis cuts inconsistant, progressively worse over course of job. Chinese Trocen cont
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  1. #1

    Question Y axis cuts inconsistant, progressively worse over course of job. Chinese Trocen cont

    Hello all!
    I am rather new to CNC's, but have spent the last few months obsessively reading and upgrading my 50w Trocen controlled chinese blue machine 500x300mm.
    The problem I am running into is that my machine is becoming very inaccurate along the y axis. when I cut a series of slots or holes moving down the y axis, the spacing becomes progressively inaccurate. as the job progresses, even the slots themselves do not end up where they began, as if the cutting head moves up less than it moved down. if I cut circular dials, the central holes become more and more off center. I have already spent a long time with laser alignment, and gantry squaring and it doesnt appear to be that. it is accurate at the beginning of a job, and becomes progressively worse, as if every time it tries to return to a given Y position it doesnt quite get there. I will attach some photos to show what I mean.(the photos are all rotated , not sure why. the gap in the circles is along the y axis) Raster engrave seems to work just fine, although there seem to be more pronounced ridges. Is this a stepper motor problem? thanks everyone.

  2. #2
    Community Moderator Jim Dawson's Avatar
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    Re: Y axis cuts inconsistant, progressively worse over course of job. Chinese Trocen

    A slipping motor coupling or pulley perhaps?
    Jim Dawson
    Sandy, Oregon, USA

  3. #3
    Quote Originally Posted by Jim Dawson View Post
    A slipping motor coupling or pulley perhaps?
    Do you mean the belts? I have checked both y axis belts for same tension/enough tension. Can the pulleys themselves be slipping?

  4. #4
    Community Moderator Jim Dawson's Avatar
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    Re: Y axis cuts inconsistant, progressively worse over course of job. Chinese Trocen

    Yes, it's possible for the pulleys to slip on the shafts. Sometimes they come loose.
    Jim Dawson
    Sandy, Oregon, USA

  5. #5
    Quote Originally Posted by Jim Dawson View Post
    Yes, it's possible for the pulleys to slip on the shafts. Sometimes they come loose.
    I will check into that tonight, Thanks!

  6. #6
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    Re: Y axis cuts inconsistant, progressively worse over course of job. Chinese Trocen

    On Y axis I would grasp both pulleys on the ends of each axis and gently twist the shaft. Tighten anything that allows it to move.
    Also make sure the belt isn’t riding up on the pulley flange. Check that the belt tension doesn’t vary as the axis moves, which is unlikely unless something is bent.


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