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  1. #121
    Quote Originally Posted by luke11cnc View Post
    nice cnc you have there Jonathan are you going to paint it at some point ??
    Thanks... it's not going to rust where it is so I don't think I'll paint it. It's there to make things not look at Paint would also get annoying if I need to add bits to it.

  2. #122
    Jonathan
    Reading more and more post I find my self thinking o's##T what have I let my self in for

    I really thought 20 mm rails for the bed would be more than ample to carry the weight of the whole cnc machine

    two 20 mm rails (made from 304 stainless steel) and four bearings mounted on the 90 degree side of 40/80 profile aluminium extrusion
    and a centre ball screw (centre of the bed) 0f 16 to 20 threaded bar


    where on earth do you all get your aluminium from as I have ordered of ebay, it arrived today so bent it is unusable

    James & Luke

  3. #123
    Quote Originally Posted by luke11cnc View Post
    I really thought 20 mm rails for the bed would be more than ample to carry the weight of the whole cnc machine
    They will be ample to carry the weight since each of the 20mm bearings is rated for about 880N. That's not as excessive as it might seems though, see what I posted here:
    http://www.mycncuk.com/forums/showth...near-bearings-...

    The reason I advised using the bigger bearings is not directly due to the higher load ratings. It it because they have 5 rows of ball bearings, not 4. This seems to make them have a lot less play than the <=20mm bearings. So I'm not saying you have to get the 25mm bearings, just that it will probably be better if you do.

    Quote Originally Posted by luke11cnc View Post
    where on earth do you all get your aluminium from as I have ordered off ebay, it arrived today so bent it is unusable
    I now use http://www.aluminiumwarehouse.co.uk/
    Only issue with them is you have to buy 2000mm lengths. If there's something smaller you need let me know as I might have a bit...
    What size did you buy out of interest, and who from so I don't make the same mistake?

  4. #124
    1000th post

    So here's a video showing my router doing 1000mm/s (2362ipm) on the Y-axis:

    http://www.youtube.com/watch?v=k3MG7...=youtube_gdata

    All I did was change the pulley to 42T so the pitch of the screw is effectively 35mm. It's well above the critical speed of the screw, but interestingly it seems fine.

    The video also shows the rotating ballnuts going happily at 15000mm/min.
    Last edited by Jonathan; 15-09-2011 at 07:24 PM.

  5. #125
    I had a request for some more photos, so here they are in no particular order:

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  6. #126
    Hi,
    Jonathan what have you used on your Y axis, I can't quite make it out

  7. #127
    Quote Originally Posted by deannos View Post
    Jonathan what have you used on your Y axis, I can't quite make it out
    Which part in particular?
    It uses an RM1610 ballcrew, 3Nm stepper motor...nothing unusual.
    Old router build log here. New router build log here. Lathe build log here.
    Electric motorbike project here.

  8. #128
    Quote Originally Posted by Jonathan View Post
    Which part in particular?
    It uses an RM1610 ballcrew, 3Nm stepper motor...nothing unusual.
    Your gantry in particular, is it ali box section

  9. #129
    Quote Originally Posted by deannos View Post
    Your gantry in particular, is it ali box section
    Yep:

    Quote Originally Posted by Jonathan View Post
    I went to a small local metals supplier and picked up a meter of 80x3mm aluminium box section for the Y rails to mount on
    It's mounted with 20mm aluminium plate milled to fit in both ends. It's adequate, but I would advise using something a bit stronger. Since the rails are on both sides of the box section it had to be aluminium since the width of steel box section is not accurate enough. Extrusion is a good option, but quite expensive.
    Old router build log here. New router build log here. Lathe build log here.
    Electric motorbike project here.

  10. #130
    The first of many upgrades to come:

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    I'll be fixing 20 meters of 2"x1/2" aluminium strip under the bed in a grid to make it a bit stronger, since it's only 20mm thick aluminium. I've got 6m of the aluminium angle to go round the perimeter to enclose flood coolant, which will be the next upgrade. I'll have the router drill an array of holes to tap M8 for clamping. I elected not to go for strips (to imitate T-slots) as the difference in price is not that great in the whole scheme of things and this should be stronger although either would have been sufficient. Need to get it at the right height too...
    Old router build log here. New router build log here. Lathe build log here.
    Electric motorbike project here.

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