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  1. #71
    Quote Originally Posted by motoxy View Post
    How heavy 4 core do you recommend for the spindle?
    1mm^2 is fine, but I used 1.5mm^2 CY since that's what I have for the stepper motors and it's more efficient to buy the same for all. It's important to use shielded here and earth it well.

    Edit: Forgot to mention the reason you don't need so thick cable even though the current to the spindle is higher is it's mains voltage.
    Last edited by Jonathan; 17-01-2012 at 11:20 AM.

  2. #72
    Thanks for that Jonathan.
    The more I know, I know, I know the less. (John Owen)

  3. #73
    Hi Bruce,

    In reply to post #73 I would delete the box section and the 2 angle sections. I would then replace them with either an RHS (rectangular hollow section) of similar depth to the plate, or stack one box section on top of the another and bolt the rails&plate to that. Looks like it would be a reasonable fit based on your drawing.

    With the RHS option you could potentially delete the plate, but I think on balance I'd still leave it in.

    Hope this helps,
    Barry
    Building a CNC machine to make a better one since 2010 . . .
    MK1 (1st photo), MK2, MK3, MK4

  4. #74
    Like this?

    Click image for larger version. 

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    (not to scale, 3D cad program stopped working otherwise I'd post a proper drawing)

  5. #75
    Jonathan do you ever stop thinking? Between you and mocha I have a pretty good idea about how to progress. I will do a quick sketch and get comments.
    Thanks for your help
    Bruce
    The more I know, I know, I know the less. (John Owen)

  6. #76
    Right, here is redesign 5-1.

    Obviously I will need to figure out the best side pieces for the gantry. Am I, sorry, are we heading in the right direction?

    Bruce
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    The more I know, I know, I know the less. (John Owen)

  7. #77
    Quote Originally Posted by motoxy View Post
    are we heading in the right direction?
    You've gone for a pretty generic arrangement now, which is fine.
    It will be stronger to put the bearing blocks for the Z-axis on the Y-axis and the rails on the spindle plate. This sort of thing (mine):

    Click image for larger version. 

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    Quote Originally Posted by motoxy View Post
    Between you and mocha I have a pretty good idea about how to progress.
    Time spent discussing his machine was well spent then.
    Last edited by Jonathan; 18-01-2012 at 12:09 AM.

  8. #78
    Hi Bruce,

    I meant one of these to keep your re-design work to a minimum. But what you've since drawn is also good.

    Click image for larger version. 

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    Building a CNC machine to make a better one since 2010 . . .
    MK1 (1st photo), MK2, MK3, MK4

  9. #79
    Routercnc - Thanks for that. The latest soluton allows for the screw nut to travel between the rails which keeps the overhang to a minimum. Apparently I still have a bit more work to do on that.:whistling:

    Chip - I realise it may be a bit belt and braces but what I have learnt so far is that strength is paramount. The back plate will assit in the end supports and reduce any rotaional force on the boxes....maybe

    Thanks for the comments guys

    Bruce

    Forgot to mention i order the cabling. I dare not order any other materials as there is still time for a few more designs.
    The more I know, I know, I know the less. (John Owen)

  10. #80
    Cleaned up the drawing a bit and corrected the plate thickness on the spindle mount. I have placed the rails on the spindle plate. I am not sure that I understand why as the increase in plate dimension and the rails being further from the center of the gantry would surely put more pressure on the gantry rails. I am obviously missing something here.

    Bruce
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    The more I know, I know, I know the less. (John Owen)

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