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  1. #1
    Hi guys,

    Dave here. I'm designing a new machine for the office in the hopes of carving precision rifle stocks (4 axis) and whatever else is required from hardwood and aluminium. :)

    The build is already underway and frame currently ready to be painted.

    Details of the build
    ==============

    Linear bearings: SBR20 fully supported rails - X:1300mm - Y:1000mm - Z:450mm
    Ball screws: RM2005 Chinese - X:1350mm - Y:1050mm - Z:500mm
    Steppers: Nema23 - 23HS45-4204S
    Drivers: M542H
    PSU: 48V 600w DC

    Frame/Chassis: 65x65x3mm box steel
    X axis chassis: 75x75x4mm box steel
    Gantry cross beam: 200x100x5mm box steel
    Gantry supports: 300x125x10mm steel angle
    Z axis supports: 200x480x10mm steel plate

    Contrary to most builds on here I do not have a CAD diagram to show as the build is a running design at present. I have very little CAD skills unlike my wife, who regularly makes designs in Solidworks.

    Here's some pics of the current build:

    original design
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    Adjustible feet
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    Front on view - all level within ~1mm
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    Side view
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    Z axis setup.
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    Gantry side on.
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    Anyway, thought i'd share guys. let me know what you think. :)

    - Dave.

  2. The Following User Says Thank You to Slixxor For This Useful Post:


  3. #2
    Looking good so far Dave.
    Any reason for the 2005 ballscrews? The 1605/1610 are more popular because they have lower inertia which helps with the acceleration and deceleration, especially on the modest 48V you are using.
    Building a CNC machine to make a better one since 2010 . . .
    MK1 (1st photo), MK2, MK3, MK4

  4. #3
    Quote Originally Posted by routercnc View Post
    Looking good so far Dave.
    Any reason for the 2005 ballscrews? The 1605/1610 are more popular because they have lower inertia which helps with the acceleration and deceleration, especially on the modest 48V you are using.
    I havent purchased the PSU yet. so may go larger. the motors claim to have a max voltage of 48v. i can get a 60V no troubles but am not sure of the impact that would have on the steppers. As far as the RM2005's goes, i was aiming for a rigid setup for cutting aluminium and didnt want any wobble from ball screws. Feed rate isnt that critical for me.

  5. #4
    Quote Originally Posted by Slixxor View Post
    I havent purchased the PSU yet. so may go larger. the motors claim to have a max voltage of 48v. i can get a 60V no troubles but am not sure of the impact that would have on the steppers. As far as the RM2005's goes, i was aiming for a rigid setup for cutting aluminium and didnt want any wobble from ball screws. Feed rate isnt that critical for me.
    I wouldn't be worried about the steppers but the drives in your spec you have said that you are using these M542H If I am not mistaken the max voltage they will handle is 50V so 48V would be too high for them. AM882 drives would be a better choice running at about 68-70 V.

    If you want a decent machine you have to have decent electronics.
    ..Clive

  6. #5
    Quote Originally Posted by Clive S View Post
    I wouldn't be worried about the steppers but the drives in your spec you have said that you are using these M542H If I am not mistaken the max voltage they will handle is 50V so 48V would be too high for them. AM882 drives would be a better choice running at about 68-70 V.

    If you want a decent machine you have to have decent electronics.
    Ok, it's now being considered. :) havent bought the drivers yet either. you are right indeed, my voltage restriction was the M542H. price is only AU $20 more per driver.

  7. #6
    Quote Originally Posted by Slixxor View Post
    Ok, it's now being considered. :) havent bought the drivers yet either. you are right indeed, my voltage restriction was the M542H. price is only AU $20 more per driver.
    Ok then if you have not bought the motors either then try and find 8 wire so they can be connected in parallel and get the lowest inductance motors you can find these are proved and tested by many over here :- http://cnc4you.co.uk/resources/Stepp...1B%203.1Nm.pdf.

    Good luck with the build.
    ..Clive

  8. #7
    Quote Originally Posted by Clive S View Post
    Ok then if you have not bought the motors either then try and find 8 wire so they can be connected in parallel and get the lowest inductance motors you can find these are proved and tested by many over here :- http://cnc4you.co.uk/resources/Stepp...1B%203.1Nm.pdf.

    Good luck with the build.

    I have the motors already and all mounting hardware. saving the electronics for last. The AM882's are in the price range. I am running dual ballscrews on the X Axis. so additonal cost. but oh well :)
    Last edited by Slixxor; 15-06-2016 at 08:04 AM.

  9. #8
    You can run both X axis screws with one motor and belt connecting them,it's common practice with the guys on the forum.
    Good luck
    Mike

  10. #9
    Quote Originally Posted by mekanik View Post
    You can run both X axis screws with one motor and belt connecting them,it's common practice with the guys on the forum.
    Good luck
    Mike

    I have noticed that. but whats the go with custom belts? Obviously each machine will differ in length required. Do you simply ask for a particular length?

  11. #10
    You can get custom belts but they are more expensive, but you have a lot of leeway length wise as you will have adjustment on the motor and your tension/routing belt layout. there was a post on the forum a while ago showing a belt routing setup to address this issue.
    Regards
    Mike

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