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Thread: One BF20L more

  1. #1
    Hi,

    I start building the Optimum BF20L based on Robocnc plans.

    Electronics that will used are from CNCDRIVE, 250W servo motors on X-Y, 400W on Z, 1.2KW power supply and UCCNC S/W.
    Direct drive and i will try to open oil pockets.

    Click image for larger version. 

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  2. #2
    Very interesting, looking forward to hearing more! One question springs to mind, how come the Z axis requires so much more power than X or Y?

  3. #3
    i am not an expert on the subject. My thought is that because of the z axi's weight, extra power may required. Also the ballscrew is M20 instead of M16 used on the X-Y axis

  4. #4
    Quote Originally Posted by antomost View Post
    i am not an expert on the subject. My thought is that because of the z axi's weight, extra power may required. Also the ballscrew is M20 instead of M16 used on the X-Y axis

    Ah! Were those sizes of motors recommended by another build then? There is a motor size calculator floating around these forums somewhere, although I don't know if it also calculates for servos - you might find it interesting.

    My line of thought was that the Z axis is typically held in place moving less frequently with lower accelerations, whilst the X and Y have to deal with the cutting forces - hence why I asked the original question. I can certainly see your logic - and the inertia of the larger screw will make a reasonable difference.

  5. #5
    Hello all, looks likes anniversary reply but I just had the time to continue the build. Y and X almost finished.. waiting for an enclosure (bottom bath) to be prepared by a local factory and the moving forward with the Z. Finally, I will use the same (250w) motor also for Z, direct but with a brake.

  6. #6
    Doddy's Avatar
    Lives in Preston, United Kingdom. Last Activity: 4 Hours Ago Has been a member for 6-7 years. Has a total post count of 803. Received thanks 128 times, giving thanks to others 34 times. Referred 1 members to the community.
    Having just this second recovered my little SX2.7 running steppers and 2:1 on a 1605 screw, all I can say is: Wow!, Speedy!

    Looking good.

  7. #7
    a very carefully homing!!Click image for larger version. 

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  8. Looks very snappy, I'm in the initial stages of a build on a similar machine but it has HBM stickers on instead of optimum, basically the same machine. Interesting you chose servos instead of closed loop steppers, I wish i could afford them. Looking forward to seeing the end result, not too far away, your almost done.
    Derek

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