micellular
has rocks in the head
Rock fever is curable with more rocks.
Member since September 2015
Posts: 640
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Post by micellular on Jan 29, 2016 14:40:53 GMT -5
They are asking for $75. No pics.
"This clutch motor came off an industrial sewing machine. It is branded "Ever-Ready" "clutch master", and distributed by A.C. Webber. It is a slow speed motor (by industrial standards), 110VAC, 1725RPM, 1/2HP 5.3 Amps. Made in Japan motor, not China clone. The model is listed as STK-M2. Has an inline wired on/off switch on the plug wire. The motor has been in storage for a few years and has a bit of resulting corrosion in the paint, but the motor powers on and off fine, and the clutch mechanism works perfectly."
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zarguy
fully equipped rock polisher
Cedar City, Utah - rockhound heaven!
Member since December 2005
Posts: 1,791
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Post by zarguy on Jan 29, 2016 14:52:15 GMT -5
Perfect motor for many lapidary applications. Talk 'em down to $50. I've gotten similar used motors for even less. Lynn
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Post by Pat on Jan 29, 2016 15:04:32 GMT -5
We get a lot of motors donated to our rock sales. High price is $25. We've sold some at $5 each, and given away those that don't run.
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Post by Rockoonz on Jan 29, 2016 15:29:41 GMT -5
Is there a reason you want a motor with a clutch? I could see it if you want to be able to start and stop whatever you hook it to with a foot pedal, but otherwise you will have to permanently engage it somehow.
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micellular
has rocks in the head
Rock fever is curable with more rocks.
Member since September 2015
Posts: 640
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Post by micellular on Jan 29, 2016 16:32:11 GMT -5
I'm looking at possibly replacing the motor on this machine. This motor was just the only 1/2 HP AC motor on craigslist in my area. Rockoonz, you called it: Since I have no idea what RPM or SFPM this is running at, I started out at 70% on the rheostat and had a huge problem with striations that I couldn't get rid of. As I go up to 90-100% (of max 2450 rpm), they get better but are still a problem. After using Pat's Pixie and Genie, I noticed the wheels don't seem to be rotating as quickly. Also recently noted that the wheels definitely slow down if I press at all firmly against the soft wheels. Since there is now a mysterious sound that isn't the bearings or set screws, I'm wondering if it's the motor getting tired. Pat, I might just for the club sale and talk to someone in person, since I know pretty much jack diddly squat about motors.
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Post by Pat on Jan 29, 2016 22:32:24 GMT -5
micellular. If you mean my machines were slow, I must tell you I have oiled the leathers in the Genie. The Pixie is so old, I don't know if it has leathers!
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micellular
has rocks in the head
Rock fever is curable with more rocks.
Member since September 2015
Posts: 640
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Post by micellular on Jan 29, 2016 22:46:43 GMT -5
Pat, no, I think your machines are fine! The nominal rpm of my motor is 2450, but what I'm saying is that the actual rate of the wheels at 90% appears to be slower than the standard 1750 rpm, especially if I'm pushing at all on the soft wheels. That's why I'm wondering if my motor is wearing out.
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Post by Rockoonz on Jan 30, 2016 5:12:47 GMT -5
AC motors with speed controls lose a lot of torque at lower RPMS
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NDK
Cave Dweller
Member since January 2009
Posts: 9,440
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Post by NDK on Jan 30, 2016 14:57:07 GMT -5
Michelle, 1/2 hp may be overkill for your machine. Maybe search for a 1/3 hp motor, they're more common. Also, if there's a habitat for humanity ReStore in your area, check there. My local restore almost always has motors.
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Norman
off to a rocking start
Member since January 2016
Posts: 12
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Post by Norman on Jan 31, 2016 13:59:24 GMT -5
AC motors with speed controls lose a lot of torque at lower RPMS This is true.. I would always go with DC Motor, consistent RPM throughout. I have converted a 2 HP DC motor from treadmill and used speed control that did come with it and its being used on my lathe and it is the best conversion I could have made. DC all the way. Speedmaster Controller with Leeson DC Motor is the best setup you can get. The can be found on Ebay for cheap sometimes but they dont come cheap. I have 1 set and 7 years its still going like its new.
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micellular
has rocks in the head
Rock fever is curable with more rocks.
Member since September 2015
Posts: 640
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Post by micellular on Jan 31, 2016 21:30:52 GMT -5
Rockoonz, NormanSorry I wasn't clear. The current motor that I have is a DC motor.
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Norman
off to a rocking start
Member since January 2016
Posts: 12
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Post by Norman on Jan 31, 2016 22:19:53 GMT -5
Rockoonz , Norman Sorry I wasn't clear. The current motor that I have is a DC motor. Ohh you are all set as long as you have a good speed control you won't need anything else and those babe's can last a long time. Eventually you will have to change brushes but it's rear. I/2 hp lol that's just to much you can run band saw, drill press and lathe with that thing So to be clear DC motor requires a speed controler in order for it to work. AC motor does not and it can be plugged into your wall outlet to operate.
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Post by Rockoonz on Jan 31, 2016 23:10:23 GMT -5
Can you change the pulleys so your full speed is what you want? Are you sure that the drive belt isn't slipping? As Norman said, brushes can wear out on a DC motor, if they are close to being finished that could possibly be your torque problem. Didn't you post a photo back when you purchased the unit? Pics might help, trying to troubleshoot tools over the interwebs is difficult.
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micellular
has rocks in the head
Rock fever is curable with more rocks.
Member since September 2015
Posts: 640
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Post by micellular on Feb 5, 2016 14:13:25 GMT -5
Well, had a couple mechE friends take a look at it...
The motor's fine. The bearings are wearing out - ALREADY. The arbor has a fundamentally flawed design. Since the bearings are exposed to the mud squirter, and I thought wrongly that since they were shielded bearings they would be able to take the water. Lesson learned: 1) make sure the bearings are protected from water and rock dust, and 2) If not, at the very least use a freshwater system instead of recircing rock dust everywhere.
It's going to be way too much of a PITA to replace the bearings again, since they are quite firmly glued in place. Think I'll keep an eye out for a nice used Genie and wait til I know a loooot more about tinkering before attempting to work with another home build.
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Post by Rockoonz on Feb 6, 2016 1:35:42 GMT -5
Bearings can be problematic nowadays. I an stocking up on all the old stock US made saw arbor bearings I can get my hands on. The imported ones just don't hold up, replaced the ones in my 14 inch saw after less than 2 years.
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