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  1. Thanks, the proma THC is the unit I am thinking of using when I fit THC, the THC and driver does not seem to be available anymore but the THC on its own is.

    0.5mm or better is plenty good enough I think.

  2. Here's the reduced frame with side tracks fitted...

    And the two Y-axis trolleys...
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    Coming along nicely.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  3. #23
    I'm looking into a bigger project but I also want to use my chinese plasma in it. I always keep my torch in contact during cutting. I plan to spring load the torch to follow undulations in the surface.

  4. The Following User Says Thank You to Peter Fouché For This Useful Post:

  5. Yes, someone else has just suggested a sprung loaded torch as well, I am fitting a stepper drive z-axis so I can get the torch clear while rapid moving, a floating or gravity/sprung head sounds a good addition.

  6. #25
    Quote Originally Posted by Davek0974 View Post
    0.5mm or better is plenty good enough I think.
    Errors accumulate in the build :-) , its not only one thing. I strive to make everything perfect in my build, even knowing that could not be.

    Also accuracy is ok when depends for whom and for what purpose.

    FYI after reading your answer i went in the garage and started precisely measuring the 10mm thick steel elements that ordered lasercut for my build. I haven't done it before as everything fit nice together. Guess what - 0.01 -0.03mm at the most, different from the drawing.

    A properly constructed , aligned and calibrated belt driven machine can offer real life precision in the ballpark of 0.05mm. Yes, even with roller bearings and belt. This for the unbelievers. My machine uses V bearings / roller bearings inside- 608/ on supported rail. When i bought it new it was in the 0.5mm ballpark, a couple of days thinking and bettering it and now is in the 0.05 -0.1 mm , i am talking about router not plasma.

    So, take your time and strive, you could make a very precise machine if you invest more time and precision right now when building it.

  7. The Following User Says Thank You to Boyan Silyavski For This Useful Post:

  8. Sound advice.

    im trying to build as controlled and tight as possible, but this is a learning machine and never having seen one up close, I have no idea of speeds, acceleration, deceleration forces etc so maybe it will work wonderfully first time or maybe I will need to rebuild bits of it.

    one thing I am surprised at is how difficult it is building small - every millimetre of axis travel counts and things keep getting in the way - gantry mounts, trolley brackets and so on.. Building a nice big table would have been much easier but I have nowhere to put it :(

  9. #27
    As it would be only plasma machine, you could go light and simple on everything. Take a look at the ebay kits they sell and improvise. The Proma kit they sell at they web also. I pointed it to you as the second piece is the Z driver and will simplify things even further if you have not bought the drivers for the motors. Look at his simple Z axis.

    it not my machine, cause the part i want to show you is hidden inside, so i can not make photo of it but that's what i meant for clocking the gantry belts:

    Click image for larger version. 

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    that is good idea for simple Z DIY CNC Plasma cutter axis rail car for nema 23 stepper motors | eBay

    If i were at this point where you are, i would buy a 1 second hand wide type square rail with bearing block or two for around 100-200eur shipped to you from ebay for the gantry, as it will be far better than the other solutions. This wider type of rail will hold a very light z perfectly, move it fast and precisely and simplify a lot the build.

    something like this LAW21EL+710-2 Linear Bearing 1Rail 2Block NSK Used Wide type K1 lubricate seal | eBay

  10. The Following User Says Thank You to Boyan Silyavski For This Useful Post:

  11. That picture is almost identical to what I have built :)

    i have designed a carriage for the x axis on the gantry and will start machining it as soon as the aluminium arrives. It rides directly in the gantry beam, pretty much like the one in the eBay listing you added, but mine is made out of aluminium slab, same sort of bearing layout though.

    hopefully have it made by Monday as I'm still finishing the gantry trucks and motor mount.

  12. Made the X-axis trolley today, came out lovely...
    Click image for larger version. 

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    The motion is smooth as silk and no twist or slack at all, very happy with that. The front plate is drilled for the motorised Z axis I have already waiting.

  13. Steel bearings running on ali profile? Smooth now but that profile will wear; maybe not as fast on a plasma m/c as no cutting forces but eventually you'll find 'loose' sections...

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