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    Default What size stepper motors needed?

    I am wanting to modify my Y & Z carriages on 4x8 cnc. I will have approx. 140# for Y/Z carriage. I will be using rack n pinion to move this carriage assembly on v-wheels. I am cutting wood and some plastics. Any ideas as to what size stepper motors I will need to drive this carriage plus having enough torque to cut wood and plastics?

    Gary

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    Registered Jim Dawson's Avatar
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    Default Re: What size stepper motors needed?

    You would be safe with a 1200 oz/in NEMA 34 stepper. Operate them at near the maximum voltage that the drive will handle. That should give you 500 IPM rapids and plenty of torque for cutting. I had a similar system on my router that was a lot heavier than yours with a 1.5:1 belt reduction. Moved the Y at 0.75 inches per motor rotation.

    For steppers, I like the Automation Direct steppers & drives. Not cheap, but they work well. https://www.automationdirect.com/adc...tepper_systems

    You might look at the ClearPath servos, I have had good luck with them. https://www.teknic.com/products/clea...-servo-motors/

    or the DMM servos, I use those also. DMM | AC SERVO DRIVE | AC SERVO MOTOR | ROTARY ENCODER

    Jim Dawson
    Sandy, Oregon, USA


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    Community Moderator ger21's Avatar
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    Default Re: What size stepper motors needed?

    Are you using any gear reduction to the pinions? Are you building your own drives, or buying off the shelf drives?

    Gerry

    UCCNC 2017 Screenset
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    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


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    Default Re: What size stepper motors needed?

    I am not planning on any gear reduction. I would most likely buy off the shelf motors, and may have to buy new drives to power the new motors.



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    Registered Jim Dawson's Avatar
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    Default Re: What size stepper motors needed?

    What is the pitch diameter of the gear that you are planning on using to mate with the rack?

    Jim Dawson
    Sandy, Oregon, USA


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    Default Re: What size stepper motors needed?

    You won't get very good motion or performance running direct drive.

    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


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    Default Re: What size stepper motors needed?

    ger 21

    Please explain your comment about direct drive.



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    Community Moderator ger21's Avatar
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    Default Re: What size stepper motors needed?

    Resolution will be very poor, which will result in motion that is not very smooth.
    And you'll need a much bigger motor, as you won't have the benefit of gear reduction, which increases torque at the pinion.

    With steppers, you want between 3:1 and 5:1 reduction, with a 1" diameter pinion. Larger pinions give smoother motion, but require even more reduction.

    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


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    Default Re: What size stepper motors needed?

    ger 21

    Bigger motor than Nema 34 1288 oz? How much difference would the drivers make? I am thinking about the Gecko v203's.What motor brands do you recommend? Any and all suggestions are appreciated.



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What size stepper motors needed?

What size stepper motors needed?