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  1. #21
    Quote Originally Posted by Crunch View Post
    I was going to order from Fred at BST
    He has offered machining the ends for pulleys.
    He also offered better bk/bf bearings.
    Is this the bearings you are talking about?

    Thanks for advice

    Sent from my SM-G900F using Tapatalk
    Yes those are correct bearings. Just tell Fred the f length you require but as I have said the ball screw length includes the f length . Its an easy mistake to make.

    So just order say ball screw machined both ends 1610 x 1200 with f length of 30mm

    (where 1200 is the total length)

    For the avoidance of doubt my router has twin screws twin motors and the screws are 1450mm overall. Motors nema 23 . without any problems.
    Last edited by Clive S; 04-05-2019 at 12:49 PM.
    ..Clive
    The more you know, The better you know, How little you know

  2. #22
    Quote Originally Posted by Clive S View Post
    Yes those are correct bearings. Just tell Fred the f length you require but as I have said the ball screw length includes the f length . Its an easy mistake to make.

    So just order say ball screw machined both ends 1610 x 1200 with f length of 30mm

    (where 1200 is the total length)

    For the avoidance of doubt my router has twin screws twin motors and the screws are 1450mm overall. Motors nema 23 . without any problems.
    Are your ball screws 1610 or 2010 ??
    How heavy is your gantry, roughly ??

  3. #23
    Quote Originally Posted by Crunch View Post
    Are your ball screws 1610 or 2010 ??
    How heavy is your gantry, roughly ??
    1610 and about 70kg

    Click image for larger version. 

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    there are two 1000x60x60 x5mm box section behind the front plate on the gantry.

    Also you don't need the screw to be the full length of the machine
    ..Clive
    The more you know, The better you know, How little you know

  4. #24
    I like the ajustable bed.

    How wide are the plates top and bottom of your gantry. As you have slotted your gantry for ball screw.
    I like the look of your gantry.

    The slot in your gantry is what I had planned for my box steel,so I could fit the ball screw inside. But I didn't realise how much strength I was going to lose. I ordered 8 mm thick to allow for it. After posting here and getting the information realise it will weaken it to much.



    Sent from my SM-G900F using Tapatalk

  5. #25
    If I was doing it again I probably would have used heavy duty ali profile formed in a L shape. But that was my first router.. Gantry front plate 1000x210mm
    Some pics here:- https://photos.app.goo.gl/cfbXGLBdxYvB9s536
    ..Clive
    The more you know, The better you know, How little you know

  6. #26
    Quote Originally Posted by pippin88 View Post
    Don't cut the tube. Add diagonal braces and end caps (welded, glued, or bolted).

    Don't worry about weight. My dual drive 381 Oz in steppers will throw around my 100kg gantry system at 20metres/min.

    Pippin88,

    How do you get 20m/min out of those motors direct-driving your screws? Is it something to do with the quality of screws you're using?

    I can only get 7m/min direct-driving 1530mm of 2010 which (I thought) agreed with the theoretical max speed of the calculations I did.

    On a 16mm pitch that same calculation says I could maybe get 12144mm/min on the same motors but that still seems way off what you're managing (and my gantry is light - made-from-plywood-light!).

    Matthew
    Last edited by mattnedgus; 03-06-2019 at 10:09 PM.

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