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  1. #1
    If you had the choice, for an aluminium router, would use supported rail, or precision linear rails. You know the ones with the carriages, rather than the bearing blocks?

    Pros and cons of each?

    Cheers,
    Dave.

  2. #2
    The supported rails are better then the unsupported mate, however if its your first machine look at what you want it to do, if you get 20mm rail over a shorter distance then you would get a way with it. Getting one up and running first, then look at the cost side of it and build to your budget.

    Once your more in the know, maybe spend a little more and build an even better machine.

    Have a read of this post: http://www.mycncuk.com/forums/showthread.php?t=256
    Last edited by Lee Roberts; 11-11-2008 at 12:48 PM. Reason: spelling
    .Me

  3. #3

  4. #4
    Its just after Kieth saying in effect saying my first design was crap, I went back to the drawing board. It got slightly better, but now for a third time (and hopefully final time) I re-designed, to... (see pic). Which uses linear rails.

    I'd rather have linear rails because the attach easily to aluminium profile, where as supported rail, i would need to do lots of drilling etc. So what I was basically asking was, can I get away with using the rail, or is round supported better?
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  5. #5
    Have a look at this machine: www.cncdudez.com


    Let me know when you want to buy the ali frame i can get it quite cheap!
    Last edited by Lee Roberts; 11-11-2008 at 06:55 PM. Reason: spelling! - grammer !
    .Me

  6. #6

  7. #7
    No sorry they are about the same.
    .Me

  8. #8
    What are you looking at machining? Looking at your design either supported round rail or the profiled rail would do.
    I think the 20mm profiled rail is a bit of an overkill for hte size of you machine? and 15mm would be fine.
    With the round rail you can also use the SHF mountings for supporting the rail and this will connect direct to the aluminium profiles with t slots.

    Gary

    Quote Originally Posted by lateAtNight View Post
    Its just after Kieth saying in effect saying my first design was crap, I went back to the drawing board. It got slightly better, but now for a third time (and hopefully final time) I re-designed, to... (see pic). Which uses linear rails.

    I'd rather have linear rails because the attach easily to aluminium profile, where as supported rail, i would need to do lots of drilling etc. So what I was basically asking was, can I get away with using the rail, or is round supported better?

  9. #9
    Lee; thanks for the link. There is some interesting stuff on there.

    Gary... Yes the 20mm was over kill, I was just messing around. Although I find it quite funny that you knew it was 20 just from the pic :D. 15 it is...

    Do you mind me asking if Zaps linear rails are the same as Marchant Dice? There seems to be a fair price difference, but you seem to have bigger carriages, so I am assuming thats where the price difference comes from?

    Do you think I could get away with using 2 carriages on the Y axis?

    Looking to machine aluminium... Small (ish) parts, but quite deep probably... ie i'm not just making signs or engraving.

  10. The reason i said that the 20mm profiled rail is most likely an overkill, was based on the design of the machine and what he is machining.
    This is just an estimation because no real data is available, but the the basic loading of the BRH15 is 850kgf (dynamic) and the BHF20 is 1450kgf.


    How much load will machining small pieces of ali impose on the bearing?

    I cant imagine it is anyware near what the bearings is capable of?



    Quote Originally Posted by Kip View Post
    How is it overkill to use 20mm rail....As far as using a single carriage...forget the notion......Check the spec sheets for details/differences between manufacturers parts.

    Bearing in mind that cutting forces have to go somewhere and the bearing surface on linear bearings is very small compared to oilite bushes and dovetails......

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