Need a good supplier for geared motors

MillenniumFalsehood · Post by **MillenniumFalsehood** » Sat Jun 21, 2008 8:28 am

Okay, heres the deal. I need at least 14 high-speed, high-torque motors for my R/C/ Battlemech project, and initially I thought drill might be a good source for them. After all, they're high speed and designed to force screws and bolts through concrete and metal, so they're ideal. However, it's hard to come by drill cheaply, so instead I thought it best to go straight for the source. Can someone link me to a place to buy electric drill motors complete with gearboxes? The gearboxes are, of course, the important part, and I need them to be free of the Jacob's chuck obviously. So anyway, can someone give me a big hand here?

Kylwell · Post by **Kylwell** » Sat Jun 21, 2008 10:06 am

Have you tried [url=http://www.sciplus.com/category.cfm/subsection/18]SciPlus/url]?

karim · Post by **karim** » Sat Jun 21, 2008 10:11 am

maybe I'm missing something, but why not use RC servos?

Kylwell · Post by **Kylwell** » Sat Jun 21, 2008 10:13 am

karim wrote:maybe I'm missing something, but why not use RC servos?

Not enough power.

Digger1 · Post by **Digger1** » Sat Jun 21, 2008 10:25 am

micromark sells some
http://www.ares-server.com/Ares/Ares.as ... t&ID=82722

MillenniumFalsehood · Sat Jun 21, 2008 12:02 pm

Those Micro Mark motors look like a good motor, but they're a little expensive. At 14 motors, I'd be spending about $450. I don't have that kind of money. Would I be looking to pay that much for other high-speed/high-torque motors, or are there cheaper alternatives? I don't need the ability to chose between different gear ratios, so if it didn't have that feature that's okay.

I need these to be in the neighborhood of 600-700 RPM and have about 15-20 ft/lb of torque(if that's possible). The lead-screws I'm using are 1/2-13s (13 threads per inch), so I need a lot of speed, and this is going to be one big, heavy machine, so I need a lot of torque. The drill motors I have will work in this application if my math's right, so anything with similar performance characteristics will work in this application.

Umi_Ryuzuki · Post by **Umi_Ryuzuki** » Sat Jun 21, 2008 1:14 pm

http://www.mfacomodrills.com/index.html

http://www.maplin.co.uk/searchtemplate. ... A%20MOTORS

Maybe Johnson, or Buhler motors...

http://www.johnsonelectric.com/mediando ... arch=motor

http://www.hobby-lobby-modellbau.com/on ... otors.html

Graupner
http://www.hobby-lobby.com/elecmot.htm

Bane bots
http://banebots.com/c/GEARMOTOR

Seems to me you really need to be "investing" in stepper motors and controller boards. These will give you precise control of each joint.
for example, 360 steps at the motor would give you 1 degree of control at a joint.
So, for example: If you gear it 5:1 to gain torque, and ease the load at the motor, that would give you up to 1800 steps of rotation at any joint.

Best case scenario is a lot of cheap drills from Harbor freight.
.
.
Integy makes some low rpm/high torque motors up to 85 turns..

If you doubled the servos, one at each side of the joint and ran them in parallel to the controller, you could get up to 374- 832 ounces of torque (187.48- 416.61 ounces of torque per servo) These could also be geared to create more torque, but possible end up slower than your needs.

Joseph Osborn · Post by **Joseph Osborn** » Sat Jun 21, 2008 5:48 pm

There's a surplus place near me that had a huge box full of battery-less cordless drills for $5 a piece. But I'm with the others-- I gotta think that stepper motors would be more appropriate for a robot.