View Full Version : I need motor help!
02-13-2011, 08:47 PM
I've got this little creation I'm trying to dream up. It's going to be a tire prep stand for the money pit (race car). I've got almost everything taken care of in my head except for the motor part.
Ideally I'd like to spin the tire around 10-20 RPM, probably on the lower end of that. Normally about all you use these stands for is grinding, but I'd like to make an attachment so I could groove the tire and sipe it too, and that I believe is going to take a fair bit of torque to do (if it's even possible). Don't really need that part, but it'd be nice to make nice straight lines vs less straight lines by hand.
So, in a perfect world, 120v motor that spins a shaft around 10 RPM. I know I'll likely have to gear it down with some pulleys (or sprockets), but going from low RPM to lower RPM is much easier than 1750 to 10.
Do you guys have any ideas for what to use for a motor? By the way, as typical, the cheaper the better. My goal for this whole creation is a few hundred dollars give or take, so I don't want to spend a grand on a motor.
02-13-2011, 09:41 PM
Go get yer self an old washing machine it has a motor and a gear box the gear box will slow the motor rpm down and give you the torque you require for speed adjustments use a variac For speed controller or get fancy and use a freq drive and a 0-10 volt signal and a pot
02-13-2011, 09:44 PM
Or an old metal lathe motor and gear box there's endless possibilities
02-13-2011, 10:26 PM
I should mention this will be portable too.
I like the washing machine idea! I've got some connections to possibly get my hands on something like that!
02-13-2011, 10:29 PM
What about an old winch?
High torque low speed and built in gear reduction.
02-13-2011, 10:45 PM
Part # all10565, page 22 of their 2011 "performance parts and equipment" catalog.
They have several others that are not motorized.
You really want this to soak tires, right?
02-14-2011, 12:51 AM
I've thought of the old winch idea, just have had a heck of a time finding one that's 120v, or for that matter even a 12v one that's semi cheap and not on it's last legs.
I've seen the one from Allstar before, it's a nice unit, but $900 is a bit steep if I can do it for 200 (I'm cheap!). Plus I'd have to modify that one a lot to do what I want to do with it, so if I'm going to do all that work I might as well build what I want.
It's not for soaking tires, chemical tire prep is illegal around these parts, and not worth the health risk, fines, etc to do. I'm looking for the physical prep part (grinding, siping, grooving, needling etc).
02-14-2011, 01:23 AM
I see one of the Harbor Freight winches on sale all the time under $50.00.
For what you are doing I'd go with a DC motor. You can run them with an AC controller if that makes it easier for your setup.
I ran a subarc that had a small DC motor with an AC speed controller moving it very slow to match the diameter of what you were welding. I know this eight foot tall machine with a full hopper and new roll of wire had to weigh more then a mounted tire and that little DC motor just kept it moving along.
02-14-2011, 02:13 AM
Hmm, I'm thinking of a spindle and stand affair with a shaft driven off the hub of a jacked up truck. Not sure how to keep it from killing people tho.
pauls heating &
02-14-2011, 07:36 AM
use a bent spindle w a spare/cracked hub -mount pulley to hub/disc
then play w pulley diameters to get desired rpm of tire
( and we never soak our tires here )
02-14-2011, 09:40 PM
I was in a bearing store today, actually doing some work when my contraption came up in conversation.
I still like the DC motor idea the more I think about it... but one of the good ole farm boys at the shop told me to consider pneumatic motors to spin my tire. Haven't done much research on that route yet, but might be worth a quick look.
Never thought to look at HF for a winch! Good call. How will a winch hold up being ran for 5-10-15 minutes at a time though? I don't want to burn the motor up right away.
02-14-2011, 09:47 PM
What about a 1/2" variable speed drill? It should have enough torque to spin the tire 10 RPM but you'll need a mount for a stub axle of some kind.
02-14-2011, 09:53 PM
I like the winch idea myself, but if you want full control, and ALL the torque, you need to be thinking DC voltage my friend. Your possibilities with DC voltage is endless, not to mention more safe and easily portable.
02-16-2011, 12:09 AM
Safe? Pft! you're taking the fun out of this! lol
I've got an idea for an easy hub idea. Just going to take some plate and cut it to size, throw 3 old studs in there, weld that on a shaft and use some old bearings I have laying around to hold the shaft to the stand, with the pulley/gear/cog/mystery driving device on the other end.
pauls heating &
02-16-2011, 06:49 AM
maybe a gear reduction unit w some pulleys / 3/4 hp or so motor ?
Powered by vBulletin® Version 4.2.0 Copyright © 2013 vBulletin Solutions, Inc. All rights reserved.