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IndustryArena Forum > Laser Engraving and Cutting Machines > Laser Engraving / Cutting Machine General Topics > 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
    Join Date
    Dec 2013
    Posts
    5717

    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
    Join Date
    Dec 2013
    Posts
    5717

    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
    Join Date
    Nov 2008
    Posts
    644

    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.


    Sent from my iPhone using Tapatalk

  7. #7

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

    I pulled the entire gantry and y axis motor and shaft. you were right, there is considerable play in one of the gears. I am not sure how these are fit on, there does not seem to be any sort of notch or keyway.. I am not sure how I would find a replacement spline gear for this belt. any ideas? thank you again for the help, half way there!
    I can pull the spline about a mm off the shaft by hand, would you think it is simply press fit? the shaft itself is approx .3 in or 7.62mm, and covered in tiny ridges.
    Attached Thumbnails Attached Thumbnails 20201130_131949_compress75.jpg   20201130_131951_compress1.jpg   20201130_132525_compress3.jpg   20201130_132012_compress5.jpg  


  8. #8

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

    I just got the spline off by pulling really hard there is some sort of grey dry stuff on the shaft, reminds me of graphite lubricant, but that doesnt make much sense. could I just locktite the spline on the shaft? I just need to fix it in place yes?

  9. #9
    Join Date
    Dec 2013
    Posts
    5717

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

    For this application I think red Loctite will work. Not the best, and normally I would not recommend this for a fix. Maybe JB Weld would be worth a look also, should be right next to the Loctite on the store shelf.
    Jim Dawson
    Sandy, Oregon, USA

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