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  1. #11
    Desertboy's Avatar
    Lives in Leicester, United Kingdom. Current Activity: Viewing BUILD LOG: New start Has been a member for 0-1 years. Has a total post count of 797. Received thanks 68 times, giving thanks to others 575 times.
    Quote Originally Posted by Clive S View Post
    It might also be worth noting that the 90x45 ali profile can be tapped 12mm with a spiral tap very easily in the end holes which make a build quite simple.
    Or if you buy it from KJN they'll tap the ends for a couple of quid if you're lacking taps and I remember I think it was alex had issues until he got the right tap then it was super easy.

    I never tapped the extrusion I used an impact driver to force the M12 bolts into the extrusion, I used corners and T nuts to keep the extrusion straight (My frame is 9045) but the gantry I recessed the aluminium into the aluminium plates by 5mm each side (20mm thick plates) which kept the gantry straight whilst I bolted it on.
    Click image for larger version. 

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    I got the Hiwin recess wrong so I ended chopping 1.5cm off the Hiwin's which when I checked the Cad model was obviously wrong lol I must have been having a moment.

    Hiwin's are rated for 95%+ of their loading capacity when mounted sideways on this is why on my machine I mounted the Hiwin's where the ballscrew is on yours and the ballscrew when you have the hiwins.

    Click image for larger version. 

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    Removes triangles considerably simplifies the build but increase gantry plate height which can be an issue with flex. I'm only cutting wood and I made my gantry mounts 20mm thick so I don't think this is a problem for me. If and when I build again I'm going to build it same way I did before but undersling the ballscrew so it's out of way of any debris.

    I have to say the No.1 thing I would do differently is rotating ball nut but if not then 10mm pitch ballscrews my router is very close in size to yours my travel is 130cm*70cm but I got 5mm pitch ballscrews and this is the biggest mistake I made on my build. (If you exclude me blowing up 1 PSU lol)

    As for electronics I went with 4 AM882 (240 new from China, Toroidal transformer for 70v (80 from Rapid), $5 BOB for control with a PC parallel port and linuxcnc. I do intend to add an 7i73 board (allows me to use ethernet to breakout boards instead of PP) but I would say the setup I have is the bear minimum for a decent router. Stall protection being the bare minimum in a stepper driver.

    Good luck with your build.
    Last edited by Desertboy; 26-12-2017 at 02:16 PM. My first CNC build WIP 120cm*80cm

    If you didn't buy it from China the company you bought it from did ;)

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