548,605 active members*
2,329 visitors online*
Register for free
Login
Results 1 to 11 of 11
  1. #1
    Member
    Join Date
    Nov 2021
    Posts
    9

    Need Help and Advise Nema Motor types

    Hi, I have a tray that is 17" x 14" and have several parts placed on the tray which do a certain task. The tray needs to travel on a vertical type CNC along the 3 Axis(X,Y,Z) in front of a 16X16 matrics placed on a vertical surface(like a wall). The tray weighs 20 pounds and I am thinking to mount the tray on a Cross X and Z axis and then have the whole setup including the X,Z axis and the tray placed on a Gantry type Y axis which will need to raise and lower this heavy weight which now including everything it must be about 50 pounds.
    What type of Nema motors will I need for this setup? I appreciate your help and advise. Thank you and Happy Thanks Giving.

  2. #2
    Registered
    Join Date
    Nov 2013
    Posts
    1478

    Re: Need Help and Advise Nema Motor types

    Hi,
    a stepper is just a motor, so it will not 'lift' anything...as is. It needs to be connected to some sort of linear motion actuator.

    If you want precision and reliability the ballscews are the way to go. On Ebay and other places you can buy C7 grade rolled ballscrews including support bearings for say $100 each for
    16mm diameter, 5mm pitch and say 700mm long. C7 screw are +-50um per 300mm and 30 um cyclic....is that accurate enough?

    You can get ballscrews in 10mm and 20mm pitch, and they travel very fast but with less thrust. 5mm pitch screw travel slower but have more thrust. With 5mm pitch screws matched to
    (low inductance) 23 or 24 size steppers of say 500oz.in you'll move your 50lb easy, and at considerable speed and repeatability.

    Craig

  3. #3
    Member
    Join Date
    Nov 2021
    Posts
    9

    Re: Need Help and Advise Nema Motor types

    Hi Craig,
    Thanks for the responce, that's what I meant to use the necessary parts and all so in a way it would be a CNC router type of a machine with all the needed hardware and your info on the ball screw iand the motors are very complete and accurate and solves that problem for me. Thanks so very much.

    Cy

  4. #4
    Registered
    Join Date
    Nov 2013
    Posts
    1478

    Re: Need Help and Advise Nema Motor types

    Hi,

    Nema 34s with 650 Oz holding Torque?
    I think that is over the top, 23 size steppers of 200 oz.in I suspect would be ample.

    Lets do a rough calculation:

    Assume 1Nm torque (approx 190 oz.in)
    16mm diameter ballscrew =0.016m or 0.008m radius.
    5mm pitch =0.005m

    Mechanical advantage of ballscrew = 16mm * Pi / 5mm =10

    Force acting at 0.008m = 1N / 0.008=125N
    Thrust ( at stall) = 125N * 10 =1250N or 125kgForce....is that enough?

    Remember that is just one 200 oz.in motor, if you have two ballscrews and two motors you'd end up with double the thrust.
    You will have to consider that the torque diminishes with speed and this rough estimate is at zero speed or stall.
    With decent low inductance steppers and good high voltage drivers and supply you could rely on 50% torque at 500rpm, but that should still be plenty.

    Craig

  5. #5
    Member
    Join Date
    Nov 2021
    Posts
    9

    Re: Need Help and Advise Nema Motor types

    Craig,
    Thanks again, the formula you have given solved a lot of problems for me and saves me a lot of $ , I had ordered 34s which I now cancelled and will go with 23s of 200oz with plenty of good deals on them and since using 2 for the Y axis raising and holding the tray I will be more than OK.

    Happy Thanks giving

  6. #6
    Member
    Join Date
    Nov 2021
    Posts
    9

    Re: Need Help and Advise Nema Motor types

    Just found this great deal and bought it it should be enogh I hope:

    Package Included:---1* CNC V3 ?1* Control Board ? 4* TB6600 ? 4* Limited Switches ?4* 23HS5628 Motor with 30cm wire
    Twotrees CNC Controller Kit with Nema 23 Stepper Motor 8.0 mm shaft?TB6600 Stepper Motor Driver,GRBL CNC Shield Board?Switch Endstop $110

  7. #7
    Member
    Join Date
    Nov 2021
    Posts
    9

    Re: Need Help and Advise Nema Motor types

    Here it is

  8. #8
    Member
    Join Date
    Nov 2021
    Posts
    9

    Re: Need Help and Advise Nema Motor types

    The Basic I dea is to have a Motorized vwersion(stepper motors and All) Cross Table as in the pic below mounted on a Gantry style "Y" Axis so it could be raised/hold/lowered as well. In other word a complete CNC but in this form. The Z plate is where the Tray will be placed say 20 pounds + another 20 Lbs. for the Cross Table = 50 Lbs. to maybe 80 max.
    Please advise if the concept might work and if there are other better ways of achieving the same. Thanks

    Cy
    Attached Thumbnails Attached Thumbnails Cross Table.jpg   Cross Table 2.jpeg   Cross Table 3.jpeg  

  9. #9
    Registered
    Join Date
    Jan 2018
    Posts
    1041

    Re: Need Help and Advise Nema Motor types

    Quote Originally Posted by cyquant View Post
    Here it is

    The WORST ever 'toy' cnc kit. Built ONLY for 3D printers.
    If Craig says nema23/24 of 500oz/in then don't waste your breath with those TB6600.
    You'll end up doing it twice!.

    Think of it this way.
    You're looking a lifting a small to medium sized milling machine head.

  10. #10
    Member
    Join Date
    Nov 2021
    Posts
    9

    Re: Need Help and Advise Nema Motor types

    Quote Originally Posted by dazp1976 View Post
    The WORST ever 'toy' cnc kit. Built ONLY for 3D printers.
    If Craig says nema23/24 of 500oz/in then don't waste your breath with those TB6600.
    You'll end up doing it twice!.

    Think of it this way.
    You're looking a lifting a small to medium sized milling machine head.
    I absolutely agree, indeed Craig's advise was precious and I immediately accepted and as informed above went ahead and purchased 4 x Nema 23s but, my most recent post was about showing an approximate concept of what I have in mind to build and the question was for my purpose if the concept I have chosen is the best route?
    Last edited by cyquant; 11-26-2021 at 01:56 PM.

  11. #11
    Member
    Join Date
    Nov 2021
    Posts
    9

    Re: Need Help and Advise Nema Motor types

    I'm now focused on the below concept one on each side of the Gantry( I call this the "Y" Axis(not sure if right or wrong))to lift and hold the "X" which carries the "Z" axis with my Tray on it. Please advise if I'm not way off-course on the concept? Thanks

    P.S.
    Also since the 2 of these will be placed vertically, the carriages can hold and not fall off?
    Attached Thumbnails Attached Thumbnails Y Axis.jpg  

Similar Threads

  1. Replies: 0
    Last Post: 04-20-2021, 11:58 PM
  2. Nema 23 to Nema 34 Motor Adapters...
    By storm2313 in forum Ebay Ads here
    Replies: 0
    Last Post: 07-18-2019, 01:44 PM
  3. Stepper motor upgrade NEMA 34 or NEMA 42?
    By rogerfries in forum Bridgeport / Hardinge Mills
    Replies: 6
    Last Post: 07-28-2015, 04:59 AM
  4. Nema 17 Stepper motor on Nema 23 driver
    By Thomas T in forum General Laser Engraving / Cutting Machine Discussion
    Replies: 6
    Last Post: 10-21-2014, 08:59 AM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •