General NEMA 23 / gShield question

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RaymondOverman
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Joined: Tue May 20, 2014 8:13 pm

General NEMA 23 / gShield question

Post by RaymondOverman » Tue Feb 02, 2016 2:04 pm

After reading the gShield documentation on stepper motors and amperage draw, I would like some advice to see if I'm jumping down a rabbit hole with no end. If I'm using the standard power supply that came with the S2 (the brick/wart) and a gShield can I effectively drive a NEMA 23 and two NEMA 17s (Y, X, and Z managing one stepper respectively)? I'm looking for torque with the NEMA 23 since it will be driving a rotary shaft and a fairly heavy chuck.

Also take into account that I've already determined that a simple 2:1 (40T to 20T) reduction with a NEMA 17 won't drive the rotary shaft so there will be a load on the NEMA 23. Before I pull the trigger on buying the bigger motor I thought I might try adding a few more gears (I have extras laying around) in the chain to reduce it further but I think in the end I'll be better off with the larger motor anyway if the power supply can handle it. The added gears would probably help with the finished project anyway.

Thanks in advance. I look forward to sharing the finished results.
SO2 / NEMA 23s / 5 axis SainSmart BOB and Drivers / DW660 Spindle / Rotary Axis / Spindle-Vac Relay / LimSW / Fender Wells / Drilled and Tapped 1"x8TPI Waste Board

WillAdams
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Re: General NEMA 23 / gShield question

Post by WillAdams » Tue Feb 02, 2016 2:31 pm

There was one project which had a 4:1 ratio: https://github.com/shapeoko/Shapeoko_Ex ... yDrive4to1

http://www.shapeoko.com/forum/viewtopic ... 994#p34993
https://plus.google.com/107278631729974 ... DWAzS6ELTw

I'm surprised it wasn't a more popular upgrade, esp. back when NEMA17s were standard.
Shapeoko 3XL #0006 w/ Carbide Compact Router w/0.125″ and ¼″ Carbide 3D precision collets
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RaymondOverman
Posts: 50
Joined: Tue May 20, 2014 8:13 pm

Re: General NEMA 23 / gShield question

Post by RaymondOverman » Tue Feb 02, 2016 3:38 pm

That is much cleaner than what I was thinking of but looks like what I was thinking. I'll have to grab it and try it out. I'd much rather stay in the parameters of the NEMA 17s if possible.
SO2 / NEMA 23s / 5 axis SainSmart BOB and Drivers / DW660 Spindle / Rotary Axis / Spindle-Vac Relay / LimSW / Fender Wells / Drilled and Tapped 1"x8TPI Waste Board

cvoinescu
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Re: General NEMA 23 / gShield question

Post by cvoinescu » Tue Feb 02, 2016 5:40 pm

If you choose a NEMA 23 motor with a current rating of 1.5 A to 2 A, you won't have any trouble. Unfortunately, those are fairly rare -- the 1.7 A NEMA 23 motors I sell are made to order.
Proud owner of ShapeOko #709, eShapeOko #0, and of store.amberspyglass.co.uk

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