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  1. #1
    Ok, this has turned in to one of those projects that occupies every waking moment....every sleeping moment! Its doing my nut in but it's a dream that needs to come to reality! Ok ok may be a tad OTT

    I've read many of the build logs and have a decent understanding of what the machine needs to do and what needs to be done in order for the machine/me to acheive it. And if i can get even close to what you guys have acheived i'll be a happy man!
    The main functionality is to machine my carbon fibre plates.
    Machining ali will be a major bonus.
    If i can add an A axis at a later date to machine the likes of a motorcycle fender then even bettererererer!

    So heres a couple of pics of my current design. This must be the umpteenth version and unless you can see any flaws this is what im going with....

    Click image for larger version. 

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    X axis consists of 25mm supported rails on a box section frame made from 60x60x5mm. Box section will be drilled and tapped for the rails. Bearing blocks will be on a plate 200x100x20mm. This plate will support the Y axis upright supports that are 200mm tall. The plan to date is to have the 2510 screws fixed and use a couple of Jonathan's spinning ballscrews.
    Y axis consists of a 1000x130x20mm (may go to 25mm)plate. 80x40 ali extrusion will be attached to the length at the top and bottom of the plate. 20mm supported rails will be bolted to the extrusion to form a C shape with a 2005 ballscrew driving it. The ballnut will run within the C and again i'm thinking of using another spinning ballnut.
    Bearings for Y will be wrapped by 20mm ali plate 150mm wide.
    X axis support is 150mm wide, 500mm tall and 20mm thick. I plan to have at least 300mm travel on Z. I got some profile rails off ebay that ive since discovered are from someone on here. They weren't suitable for them so im wondering about the suitability for my application. So Z needs a little thinking about.

    I've got these steppers from Zapp and plan to use MA860 drivers with a 70v+ PSU.

    A 2kw watercooled spindle with flooding at the cutting head will be used to minimse CF dust floating about. Ill also need a vaccum attachement for MDF and the like.

    Oh and the bed. Nearly forgot about that. Height is going to be adjustable whether it be a manual job of unbolting and adjusting or using and electric scissor jacks on each corner.

    Appreciate your comments/advice.

    Cheers
    Rob

  2. #2
    Quote Originally Posted by r0bsk1 View Post
    I've got these steppers from Zapp and plan to use MA860 drivers with a 70v+ PSU.
    WHY.?? . . . . far far to big and will restrict performance not gain. To get any decent performance then you'll need far more than 70V and really need to be run using 240V drives.

    Personally I'd ask about returning and get something more suited. From what you're proposing using rotating nuts then 3-4 Nm would be enough on 70V. Even 6Nm 34's would be OTT using rotating nuts esp if twin driven X axis, and then still restrict performance compared to 3Nm 23's.!

    Bigger is NOT better and on this machine would be restrictive.!!

  3. #3
    Originaly i wasnt planning on a 2m X axis and they came up cheap on ebay. Ah well looks like they'll be going back on ebay.

  4. #4
    Quote Originally Posted by r0bsk1 View Post
    Originaly i wasnt planning on a 2m X axis and they came up cheap on ebay. Ah well looks like they'll be going back on ebay.
    I'll stop messing about trying to design the rotating ballnut mount to accommodate both size motors and just make it for the 3Nm nema 24's then? :)
    Your gantry as drawn will weigh about the same as mine, so you'll be fine with 3Nm on 70V since that's what I use and the system is virtually identical...

    Nema23 Stepper Motor 3.1Nm
    Old router build log here. New router build log here. Lathe build log here.
    Electric motorbike project here.

  5. #5
    Quote Originally Posted by Jonathan View Post
    I'll stop messing about trying to design the rotating ballnut mount to accommodate both size motors and just make it for the 3Nm nema 24's then? :)
    Aye! Sounds like a plan!

    Is a rotating ballnut on Y OTT too?

  6. #6
    Quote Originally Posted by r0bsk1 View Post
    Is a rotating ballnut on Y OTT too?
    It'll cost more than the standard setup and wont really gain anything if you use a 10mm pitch screw. I hope you've not bought the RM2005 already since RM1610 would have been much more suitable for that length, again due to critical speed.
    Old router build log here. New router build log here. Lathe build log here.
    Electric motorbike project here.

  7. #7
    Nope i've not bought anything else as yet.

    Ok so scrap the rotating nut on Y. It should secure nicely on its bearing between the Y rails. I'll have the stepper bolted to a mounting plate and have the mounting plate adjustable on the Y upright to get tension on a belt.

  8. #8
    So the old brain cells have been working overtime again......
    What if i were to have 2000mm X axis on the moving gantry and Y axis stationary? Would the current setup of 20mm tooling plate and ali extrusion be enough to prevent flex on X over 2000mm?
    This setup would suit my current workshop arrangement alot more and would make it easier to load large sheets for machining.

  9. #9
    Quote Originally Posted by r0bsk1 View Post
    So the old brain cells have been working overtime again......
    What if i were to have 2000mm X axis on the moving gantry and Y axis stationary? Would the current setup of 20mm tooling plate and ali extrusion be enough to prevent flex on X over 2000mm?
    This setup would suit my current workshop arrangement alot more and would make it easier to load large sheets for machining.
    Not understanding here.? You wouldn't want a fixed Y axis with a moving gantry machine.!! . .It just don't make sense?????

    Did you mean fixed gantry so therefore fixed y Axis.? If so then you'll have a moving Table design and the X Axis will need to be roughly twice the length required to have same cutting area.! Not good design for large format machine.

  10. #10
    Ok ill rephrase it......The 2000mm axis will be parallel to a wall and move away from the wall on the 1000mm axis.
    Loading the machine with material will be done in parallel to the wall as this side will be open.
    This will not be a moving table design.

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