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 )

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.

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.

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.

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]

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.