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What's the catch

[cgi.ebay.com]?

6 motors for $35? that seems too good to be true.

So, will these motors work in a reprap?

(and if this actually is an awesome deal, let me know so I can snatch it up smiling smiley )
Re: What's the catch
April 18, 2008 12:31PM
I can't see the item on ebay (corporate firewall) but I can think of 2 possibilities:

1. No one's bidding on it, in which case, posting the link here probably wasn't the best move. :-)

2. They might gouge you on shipping.
Re: What's the catch
April 19, 2008 01:14AM
Don't know, never can tell about this stuff. I've seen quite a few that were just legitimate deals that others over looked.

Could be too that people just didn't believe that there wasn't a catch.

Demented

Edited 1 time(s). Last edit at 04/19/2008 01:33AM by Demented Chihuahua.
Re: What's the catch
April 19, 2008 08:00AM
The big problem that I see is that there is virtually no specifications given on these motors. You know that they are NEMA 23's, you can presume that they have a max output torque of 54 oz-inch (inferred) and from the wire count, they are unipolar.

You don't know the resistance, inductance, operating voltage limits, step size, max amperage demand or anything else.
Re: What's the catch
April 19, 2008 08:32AM
Can't find any docs on the part number. Closest I could find to any info at all was that Gettys appears to have been bought out by Elwood: [www.elwood.com]
Re: What's the catch
April 19, 2008 09:06AM
Okay. I think I've got to the bottom of this. If you look at the standard stepper specified for Darwin

[export.farnell.com]

You see that the torque for it is about 140 oz-in (1.06 N-m). The motor you are looking at gives you about 54 oz-in. Assuming that the Nanotech stepper isn't vastly oversized for what it has to do, it looks like this stepper on offer gives you a bit over one-third of the torque that you need to run a Darwin.
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