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  1. #11
    Sorry I posted the wrong pics here are the ones I should have posted.If my calculations are correct the spindle should be 25mm from the edge off the front off the gantry
    Cheers
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  2. #12
    If you have not bought your screws yet the Y screw could be made shorter and the pulley and the motor could be inside the gantry as you won't be using the full length of the screw.
    Are to still at the drawing stage or have you started with the build?
    ..Clive
    The more you know, The better you know, How little you know

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  4. #13
    Hi Clive
    I have the base made which i welded for a friend but then he moved house and didnt have room for it so got it back but thats about it.I think i understand what you are saying something like this
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    Cheers

  5. #14
    Yes because the ball nut is in the centre of the z plate you could also put the screw on the back but its up to you.

    edit When you order the screws make sure you make the F length about 30mm you can always cut it off but not put it back on
    Last edited by Clive S; 07-01-2017 at 08:11 PM. Reason: added text
    ..Clive
    The more you know, The better you know, How little you know

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  7. #15
    Gregor not sure you have done enough checking etc to make sure things will fit correctly.
    I know for fact how you have it designed now the ballscrew won't fit on the gantry without lot of messing about. You'll also get clashes from Ballnut brackets etc which will result in loss of travel.

    While my design works great there's very little spare room so if your going to copy how I build them you need to follow exactly of at least check for clashes etc. This means more detailed Cad model with accurate models of parts used.

    How you have it now won't work very well. These might help explain better.
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    Last edited by JAZZCNC; 07-01-2017 at 09:46 PM.

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  9. #16
    Ok Greg the master has turned up. Take notice, I don't think he will mind copying it is easier that doing it for one's self

    So look very carefully at the pics you will learn a lot.
    ..Clive
    The more you know, The better you know, How little you know

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  11. #17
    Hi Jazzcnc
    Thanks,Nice machines .Yes my cam skills are crap .I see were you have the stepper mounted on back profile and I understand that were i have it wont work so i will move it down and make a bracket for it
    Click image for larger version. 

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    I will probably get most off the parts from aliexpress and i have tried to get all the demensions from there but there drawings are very small and hard to read ,does any body have any links were i could get the measurements

  12. #18
    Quote Originally Posted by Clive S View Post
    Ok Greg the master has turned up. Take notice, I don't think he will mind copying it is easier that doing it for one's self

    So look very carefully at the pics you will learn a lot.
    Take no notice of this Man he's being too Modest he knows far more than he lets on.!!

  13. #19
    Quote Originally Posted by JAZZCNC View Post
    Take no notice of this Man he's being too Modest he knows far more than he lets on.!!
    I was always told if you spout your mouth off. they know twice as much as you because they know what you know and what they know. Try typing that after a bottle of vino

    Its Saturday night so that's my excuse.
    ..Clive
    The more you know, The better you know, How little you know

  14. #20
    Quote Originally Posted by Gregor View Post
    I will probably get most off the parts from aliexpress and i have tried to get all the demensions from there but there drawings are very small and hard to read ,does any body have any links were i could get the measurements
    You can find Cad models of parts like BK/BF bearings. They are standard dimensions across manufactures with only slight cosmetics differences so provided you get right model they will be ok. If can't find Cad modles then just search for BK12 or BF12 which is the size for 16mm ballscrews and you'll get loads of dimension charts.
    Same with steppers Nema23 is standard size for mounting only the length changes with model type.

    Similair with ballscrews and ballnut. The size and dimensions of the ballnut are common standard dependant on style. You'll use flanged type so again you'll easily find dimensions for 16mm ballnut with only slight differences in length.
    Ballscrew machining is again standard dependant on bearing type with only the very end dimension changing according to your spec. This is what Clive is referring to when says F dimensions. Same here type RM1610 end machining and you'll get loads of dimension drawings which will suit BK12 bearings.

    Also when designing the brackets for the Motor take into account the centre distance between screw and motor along with pulley size for belt length and make sure you can buy belt the right length to give adjustment you need. Very easy to find there isn't belt size that covers for Centre distance.
    These are the little hidden details which get missed and bite you in the arse after all parts are machined.

    The one other area on this design which is close is the drop down bracket for ballscrew. Gets for tight when approaching the end bearings so pay close attention here checking for clashing.

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