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Cutting problem

Discussion in 'CNC Mills/Routers' started by pauna, Jul 6, 2019.

  1. pauna

    pauna New
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    Hello. I have a problem, can not you tell me what should be caused by this, such a cutting, I think that the belt problem I bought but it is still on the way …

    I have never had such a problem, new cnc size 1750 mm x1750 mm workBee, X controller.

    [​IMG]
    [​IMG]
     

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  2. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Loose belt, loose pulleys (check the setcrews and nb that one is on the motor flat, and tight!) or loose wheels/router mounts etc.

    Give things a wiggle, if it moves when it shouldnt, you know what to do
     
  3. pauna

    pauna New
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    Everything I checked is nothing. One problem is left alone

     
  4. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Thats a nonstandard size so I would expect some unplanned flex:

    Mitigation:
    - come up with improvements to stiffen the frame (add some steel, extra V Slot, many ideas here on the forum)
    - use proportionally lighter cuts (shallower passes) to compensate
     
    Alex Chambers likes this.
  5. Alex Chambers

    Alex Chambers Master
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    I would expect some flex in an X axis that long @pauna, but not that much! You need to be methodical - start with the router mount, X axis gantry plates, eccentric adjustment on both Z and X axes, X axis fixing to Y gantry plates. I see @Peter Van Der Walt has beaten me to the next bit of advice!
    Alex.
     
  6. pauna

    pauna New
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    Do I think I'll add another C-Beam Linear Rail? The problem is probably caused by this
     
  7. pauna

    pauna New
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    Hello, I also thought that I would face the problem. I have to find a way
     
  8. Alex Chambers

    Alex Chambers Master
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    One approach is to insert a steel "U" channel into the C beam, but if it is to work it needs to be a very good fit! Or, if you can fit it in, a steel plate on the front of the C beam. Also remember that steel+aluminium = battery = corrosion. This probably won't matter much if the fix works - the steel channel would be even more securely bonded to the aluminium C beam.
    Try searching the forum for things like C beam rigidity, workbee modified and any other phrase you can think of that might link to other people's solutions.
    Alex.
     
  9. Alex Chambers

    Alex Chambers Master
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    PS - I think the flex in the X C beam is your biggest problem and I couldn't be sure from your video, but it looked to me as though there was also some play in your Z axis/X axis gantry plates as well.
    Alex.
     
  10. pauna

    pauna New
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    thanks. I'll try to find the forum. I will do several options at first and graphically and maybe I'll find a way out
     
  11. pauna

    pauna New
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    #11 pauna, Jul 8, 2019
    Last edited: Jul 8, 2019
  12. pauna

    pauna New
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    What do you think about this structure?
    Untitled-1.jpg
     
  13. Alex Chambers

    Alex Chambers Master
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    Are you planning to run the belt through the middle of that rectangular steel tube? How would you fix it to the C beam? U channel would make life easier. I'm not sure how much stiffness 2/3 mm aluminium would add, and the screws to fix it could clash with the gantry plates. It is a solution that doesn't involve re-designing the way the gantry plates are fitted.
    Alex.
     
  14. pauna

    pauna New
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    You're right about aluminum. The place is almost no. Belts still leave me in the place. Steel squared will be split into one side 10 mm and then the side is 5 mm that puts the M5 bolt
     
  15. pauna

    pauna New
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    ....
     

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  16. pauna

    pauna New
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    I did something like this ... not so great effect
     
  17. Alex Chambers

    Alex Chambers Master
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    Neat! Hope that fixes the problem.
    Alex. :thumbsup:
     
  18. pauna

    pauna New
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  19. Alex Chambers

    Alex Chambers Master
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    Obviously not.
    Alex.
     
  20. pauna

    pauna New
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    Good result I have a vertical pressure
     
  21. pauna

    pauna New
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    More power is needed but this is a problem
     
  22. pauna

    pauna New
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    Feed rate - 2500 mm / min
    Pluge rate - 1400 mm / min
    Depth per pass 4mm

    t's a better result but I do not like it too
     

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  23. Alex Chambers

    Alex Chambers Master
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    What size bit @pauna? With the flex problems you are having you may need to go a bit shallower than 4mm.
    Alex.
     
  24. pauna

    pauna New
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    Bit is amana tool 3/16inch
     
  25. pauna

    pauna New
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    I have one more try, at this moment brought me belts 6mm

    Do you think old belts are under the scratch? Dual belts work
     

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    #25 pauna, Jul 14, 2019
    Last edited: Jul 14, 2019

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