nema 17 or 23 to turn this small rotary table?


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    *Registered User* merlin777's Avatar
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    Default nema 17 or 23 to turn this small rotary table?

    Do you think a nema 17 would be sufficient to turn this small rotary table (ungeared) or would it need a 23?

    https://www.amazon.co.uk/gp/product/...?ie=UTF8&psc=1


    one rotation of spindle would be 10 degrees on the table.

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    Community Moderator Jim Dawson's Avatar
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    Default Re: nema 17 or 23 to turn this small rotary table?

    It's not really the size of the table, but rather the required torque to turn the worm gear when under a load. At 36:1 it would require more torque than my 90:1, 6 inch RT. I'm using a NEMA 23, 280 oz/in motor, geared down 2:1. Until I put proper ball thrust bearings on the worm shaft, I could stop the RT with my hand. A RT designed for hand cranking does not have bearings to properly handle a motor drive.

    Having said that, I would go with a NEMA 23.

    Jim Dawson
    Sandy, Oregon, USA


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    *Registered User* merlin777's Avatar
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    Thanks, Jim. That makes sense.

    I'm also going to be controlling one of these which I think will need less torque: https://www.amazon.co.uk/gp/aw/d/B07BMR1HF5?psc=1&ref=yo_pop_mb_pd_title#

    This is a small capacity MKI prototype to prove a principle and learn what the critical issues are. MKII will need to be more accurate and slightly heavier duty and I'm hoping to reuse components from the MKI so using 23s makes sense.



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    Member ger21's Avatar
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    Default Re: nema 17 or 23 to turn this small rotary table?

    Nema 17's are not really suitable for any size milling machines.

    Gerry

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    [URL]http://www.thecncwoodworker.com/2017.html[/URL]

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    *Registered User* merlin777's Avatar
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    Default Re: nema 17 or 23 to turn this small rotary table?

    Quote Originally Posted by ger21 View Post
    Nema 17's are not really suitable for any size milling machines.
    23s it is then. Are there any others i should consider?



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    Community Moderator Jim Dawson's Avatar
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    Default Re: nema 17 or 23 to turn this small rotary table?

    Quote Originally Posted by merlin777 View Post
    23s it is then. Are there any others i should consider?
    Perhaps look at NEMA 34 if you require additional torque.

    Jim Dawson
    Sandy, Oregon, USA


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    *Registered User* merlin777's Avatar
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    Quote Originally Posted by Jim Dawson View Post
    Perhaps look at NEMA 34 if you require additional torque.
    Are nema the only type of steppers or just the common ones?



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    Community Moderator Jim Dawson's Avatar
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    Default Re: nema 17 or 23 to turn this small rotary table?

    NEMA refers to National Electrical Manufacturers Association. The 17, 23, 34, 42 are the frame sizes. The frame size specifies the shaft dimensions, mounting bolt pattern, and a few other parameters. It has nothing to do with the torque range or other performance parameters. However, generally the larger the frame size, the higher the range of available torque. There are other NEMA frame sizes also, but those are the most common. There are also some metric frame sizes, but I'm not sure about the designations. There are also a number of Asia ''NEMA'' frame motors available with metric shafts rather then standard Imperial shafts, but other than that, identical.

    Jim Dawson
    Sandy, Oregon, USA


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    *Registered User* merlin777's Avatar
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    Default Re: nema 17 or 23 to turn this small rotary table?

    Quote Originally Posted by Jim Dawson View Post
    NEMA refers to National Electrical Manufacturers Association. The 17, 23, 34, 42 are the frame sizes. The frame size specifies the shaft dimensions, mounting bolt pattern, and a few other parameters. It has nothing to do with the torque range or other performance parameters. However, generally the larger the frame size, the higher the range of available torque. There are other NEMA frame sizes also, but those are the most common. There are also some metric frame sizes, but I'm not sure about the designations. There are also a number of Asia ''NEMA'' frame motors available with metric shafts rather then standard Imperial shafts, but other than that, identical.
    Thanks, Jim. So having decided on the size I need (I think 23 in my case) I have to decide the spec of individual characteristics for my project and match those to the different nema 23s that are available? Is there a list of those characteristic anywhere I can work from?



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    Community Moderator Jim Dawson's Avatar
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    Default Re: nema 17 or 23 to turn this small rotary table?

    The best I can offer is this spec sheet for the Automation Direct steppers. At least Automation Direct provides realistic performance curves for their motors. Some of the Ebay sellers are, let's say, a bit optimistic.

    https://cdn.automationdirect.com/sta...stepmotors.pdf

    Jim Dawson
    Sandy, Oregon, USA


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    *Registered User* merlin777's Avatar
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    Default Re: nema 17 or 23 to turn this small rotary table?

    Thanks Jim. That'll do for a start.The tricky bit will be assessing the needs of my prototype!



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nema 17 or 23 to turn this small rotary table?

nema 17 or 23 to turn this small rotary table?