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Guitar shop CNC

Discussion in 'CNC Mills/Routers' started by John foale, Nov 7, 2014.

  1. John foale

    John foale Well-Known
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  2. Rick 2.0

    Rick 2.0 OpenBuilds Team
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    Nice build. We'll be waiting to see some of the projects it produces. :thumbsup:
     
  3. lodom

    lodom New
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    Nice job
     
  4. Wes123

    Wes123 New
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    Great build! What extrusions are you running for the gantry at that length? Any problems with deflection?
     
  5. John foale

    John foale Well-Known
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    Deflection on X is a problem, not a huge problem I had some defection on the Z axis this was due to the inferior Spindle clamp supplied,

    I purchased a aftermarket heavier duty one and that cured that problem.

    Having said that we have not really pushed the machine due to belt slip once we have upgraded the belts then it might be more of a problem.

    In this case I will look at ways of stiffening the gantry or if need be shortening it
     
  6. GrayUK

    GrayUK Master
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    Consider using a Belt on a Belt, Rack and Pinion style. It seems to be far more reliable stopping stretch and slips.

    Gray
     
  7. John foale

    John foale Well-Known
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    I will keep that in mind, thanks

    J
     
  8. Piccyman

    Piccyman Well-Known
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    Hello Gray,

    what is a Belt on a Belt, Rack and Pinion style
     
  9. Piccyman

    Piccyman Well-Known
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    I do know the belt drive design on the ox machines is flawed, it can slip to easily, also there is too much movement on the z and x axis(width in my case)
     
  10. GrayUK

    GrayUK Master
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    Piccyman:
    Basically, a belt is fixed within the actual slot of the rail, teeth facing upwards. Then, the next belt is fitted as usual with teeth facing downwards, therefore meshing, with the first fixed belt. With the wheels of the gantry pressing the two belts together. It does seem to be a logical step to take.
    There are several threads describing these methods in detail on this forum. Just do a search on "Belts", and many will appear.

    Gray
     
  11. Piccyman

    Piccyman Well-Known
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    I now know what belt on belt is, not sure i can see an advantage other than dealing with slack, is that correct GrayUK
     
  12. GrayUK

    GrayUK Master
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    Well yes, it does deal with the slack, and stops stretching over the length. This is the main problem with belt drive.
    It helps with the repetitive consistency factor, which is what CNC is all about.

    Gray
     
    Coolreactions likes this.
  13. Piccyman

    Piccyman Well-Known
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    As i have a problem with the long axis jumping now and again, I guess this is concidered a good mod.
    Also i will need to mod the short axis as there is too much flex when drilling downwards.

    I have already replaced the z axis with a pre made one from cnc4you, that was a massive improvement, the rack and pinion is nt really an easy option for me as i have a dual plate on the long axis
     
  14. treoer

    treoer New
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    I want to build the ox in this size to for my sign shop as well. What kinda of belt are you using? I am thinking of using the GT3 belt which is thicker than GT2. For motor I want to use nema 23 1.26Nm 2.8A which fit my budget but I am not sure it is strong enough for this size.

    Mike
     
  15. John foale

    John foale Well-Known
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    GT3 belts are the minimum spec I would go for, the machine uses GT2 at the moment but I believe it is being upgraded along with idlers for the X axis and strengthening the X span.
     
  16. treoer

    treoer New
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    What about motor spec?

    Thanks

    Mike
     
  17. John foale

    John foale Well-Known
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    23 NEMA 1 on X & 2 on Y and 17NEMA on Z, I don't have the exact motor specs to hand
     
  18. Piccyman

    Piccyman Well-Known
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    I have the GT2 3mm belts, my machine is 1400mm x 700mm and the belts are not really good enough for routing out guitars, they jump teeth, I am upgrading my machine completely with supported rails and ball screws or lead screws, i have had enough of the poor design problems with these would be cnc machines, that are really only good enough as 3d printers or laser printers.
     

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  19. John foale

    John foale Well-Known
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    I have to agree with you, we were sold the machine with the job in mind as a criteria, it has not lived up to it in many ways, the cost swayed the purchaser
     
  20. treoer

    treoer New
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    Thank you for sharing, I will keep these factors in mind before building anything. I just want to cut thin 3-5mm plastic sheet with my machine.
     
  21. John foale

    John foale Well-Known
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    You should be okay then with thin Plastic sheet
     
  22. Piccyman

    Piccyman Well-Known
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    one thing to look out for with the OX, make sure there is an idler pulley either side of the gear on the Nema motor, this will help to stop the belt slipping.
     
  23. treoer

    treoer New
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    Piccyman can you explain to me what you mean? The ox plate design have 4 solid v wheel on the top and 3 at the bottom. Do you mean changing the 2 middle ones on top to pulley or adding 2 edition pulley to it?

    Thanks

    Mike
     
  24. Joe Santarsiero

    Joe Santarsiero OB addict
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    Sounds like Piccyman was talking about this: http://www.openbuilds.com/threads/longest-x-axis.868/#post-10332
     
  25. Piccyman

    Piccyman Well-Known
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    This is from Colin at Robocutters, my machine didn't have this mod so the belt kept slipping.
     

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  26. Piccyman

    Piccyman Well-Known
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    DSC_0545.JPG DSC_0545.JPG I have now completely removed the short axis, and rebuilding it with 2 50x50x5mm ally square sections, supported rail and a ballscrew. The long axis, i am not sure about yet, but have 2 1400mm balls crews on their way.
     
    #26 Piccyman, Jan 23, 2015
    Last edited: Jan 26, 2015
  27. treoer

    treoer New
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    I see what you mean now, I guess its kinda catch 22, need a machine running first before you can cut a mod plate. I think I may do a double belt trick with 5mm GT3 first and see.
     
  28. John foale

    John foale Well-Known
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    Well it has been months since we purchased the machine and still not one Guitar off the machine! the supplier has been very slow in help to find solutions to our problems, we need a belt upgrade, idler pulleys etc, personally I don't see why we should pay for these "upgrades" as the machine will not do the job it was purchased for in good faith and on good advice :(
     
    #28 John foale, Feb 24, 2015
    Last edited: Feb 24, 2015
  29. Piccyman

    Piccyman Well-Known
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    I agree, I have now almost rebuilt my machine, on the plus side i now know how to build a strong machine cheaply.
     
  30. Piccyman

    Piccyman Well-Known
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    to make it worse, before i bought the machine i asked if it was strong enough to build guitars, and was told it would do it easily, not even close :-(, at best these are only good enough as a 3d printer
     

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