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Post by Jugglerguy on Jan 28, 2020 21:13:32 GMT -5
I have a Lortone ST-10. It works fine in the spring, summer, and fall. In winter weather the feed motor doesn't work. I have gotten in working by running a heat gun not the box the houses the motor on the front of the saw. Tonight I took apart the motor to see if it was gunked up with old grease. It didn't look bad to me, but I cleaned everything thoroughly and re-greased it. I wasn't sure what sort of grease to use, so I used grease from a grease gun that I use on the pillow block bearings in my tumbler. I put it all back together and I can't get it running at all. I don't have a heat gun here, so I used a hair dryer. The motor was warm to the touch, so it should be warm enough. I'm also wondering if it could be an electrical connection that isn't making contact because the metal has contracted. But all the wires in that area were pretty warm too. It's about 30 degrees in my garage tonight. Any ideas what could be wrong?   |
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Post by Drummond Island Rocks on Jan 28, 2020 21:29:58 GMT -5
Is it possible to loosen the connection between the motor and the threaded feed rod to see if the gear motor will turn with no load on it? Just trying to rule out if it is a motor issue or something else in the feed bound up. On my 14” I can just loosen one set screw and watch to see if the feed motor spins.
Chuck
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Post by Jugglerguy on Jan 28, 2020 22:21:04 GMT -5
I tried running it with the cover off and it didn’t seem to move. I’ll try loosening the set screw tomorrow.
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Post by HankRocks on Jan 28, 2020 22:26:07 GMT -5
What Chuck said. I suppose you checked the coupling between the gear box shaft and the threaded feed shaft. Mine used to come loose and spin without turning the feed shaft. If I remember correctly there is a flattened area on both shafts for the two set screws to set.
Or the feed shaft itself maybe the issue, forget how it is connected(if it is)on the back wall. You may test to see if the feed shaft turns, maybe use a wrench to turn.
Henry
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Post by oregon on Jan 29, 2020 11:59:42 GMT -5
I tried running it with the cover off and it didn’t seem to move. I’ll try loosening the set screw tomorrow. did you have the gears removed too, just to see if the rotor runs? Usually it's also a good idea to remove the rotor, clean it and the bronze bushings very well. Upon reassembling, try to align the bronze sleeves so the rotor spins freely. These shaded pole motors have very little startup torque. |
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Post by Jugglerguy on Jan 29, 2020 14:28:00 GMT -5
What Chuck said. I suppose you checked the coupling between the gear box shaft and the threaded feed shaft. Mine used to come loose and spin without turning the feed shaft. If I remember correctly there is a flattened area on both shafts for the two set screws to set. Or the feed shaft itself maybe the issue, forget how it is connected(if it is)on the back wall. You may test to see if the feed shaft turns, maybe use a wrench to turn. Henry Thanks, I'll try that. |
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Post by Jugglerguy on Jan 29, 2020 14:28:37 GMT -5
I tried running it with the cover off and it didn’t seem to move. I’ll try loosening the set screw tomorrow. did you have the gears removed too, just to see if the rotor runs? Usually it's also a good idea to remove the rotor, clean it and the bronze bushings very well. Upon reassembling, try to align the bronze sleeves so the rotor spins freely. These shaded pole motors have very little startup torque. What's the best way to clean them? |
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Post by oregon on Jan 29, 2020 21:09:40 GMT -5
What's the best way to clean them? There's probably a youtube on the 'proper' way. Usually I just remove old oil/grease from the shaft and the bronze bushing. Resoak the felt pad with a light machine oil. make sure it spins freely. |
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Post by joshuamcduffie on Jan 30, 2020 9:18:34 GMT -5
Down South, it would probably work year-round. You can just send it to me, and since I'm feeling generous, I'll even pay the shipping. Then it can be a 12-month saw.  |
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Fossilman
Cave Dweller 
Member since January 2009
Posts: 20,723 
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Post by Fossilman on Jan 30, 2020 9:41:47 GMT -5
Yes sir, field strip the whole motor, piece by piece, clean each part and assemble it back to running condition...Might have to buy a new replacement motor.. Shawn has them at therockshed.com
Rotor (motor coil) might be going out...
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Post by knave on Jan 30, 2020 17:33:56 GMT -5
Those shaded pole motors have extremely low starting torque. Bearing grease will be too thick to use in cold weather. I would recommend 3n1 or some sewing machine or clipper oil. When things warm up you can shoot some Lucas or something in there.
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Post by Jugglerguy on Jan 31, 2020 18:35:11 GMT -5
Thanks for the tips everyone. I've been really busy and haven't gotten back to the saw all week. Tomorrow I should have some time to play around with it again.
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Post by Jugglerguy on Feb 1, 2020 18:53:00 GMT -5
I took everything apart again this afternoon. I removed the bearing grease and used sewing machine oil instead. The saw is running fine right now, so I guess that worked. Thanks for the help, I really appreciate being able to come here and be pretty sure someone will be willing to help out.
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Post by knave on Feb 1, 2020 19:11:51 GMT -5
I took everything apart again this afternoon. I removed the bearing grease and used sewing machine oil instead. The saw is running fine right now, so I guess that worked. Thanks for the help, I really appreciate being able to come here and be pretty sure someone will be willing to help out. The best part is, I have lots to learn about rocks, and just happen to be involved with motors at work. I see that motor a fair bit. I really enjoy your informative videos, there’s a dearth of info on YT about the finer points of Lot-O tumbling. Happy it was a simple fix Rob. |
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Post by knave on Feb 1, 2020 19:13:04 GMT -5
And quit throwing them pudding and petoskey stones into the lake! Lol I have money for postage by all means. (wink, wink)  |
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Post by Jugglerguy on Feb 2, 2020 17:13:57 GMT -5
And quit throwing them pudding and petoskey stones into the lake! Lol I have money for postage by all means. (wink, wink) I never knew that so many people would be pissed off by me throwing rocks onto the lake. I guess they are not people who live near large bodies of water. If they did, they'd realize how powerful the waves and ice are in moving rocks around. Rob |
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Post by knave on Feb 2, 2020 17:35:08 GMT -5
I believe it. And I hope you know I was just giving you grief! Lol
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Post by Jugglerguy on Feb 2, 2020 19:42:16 GMT -5
I believe it. And I hope you know I was just giving you grief! Lol Yep, I picked uo on that right away! |
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Post by RocksInNJ on Feb 2, 2020 21:27:57 GMT -5
And quit throwing them pudding and petoskey stones into the lake! Lol I have money for postage by all means. (wink, wink) I never knew that so many people would be pissed off by me throwing rocks onto the lake. I guess they are not people who live near large bodies of water. If they did, they'd realize how powerful the waves and ice are in moving rocks around. Rob We’re not pissed. Just super jealous and wish they’d magically float their way to us. Some of us are cursed with hounding nothing but fractured quartz and cobblestones no mater where we go. |
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Post by oregon on Feb 2, 2020 22:53:30 GMT -5
I took everything apart again this afternoon. I removed the bearing grease and used sewing machine oil instead. The saw is running fine right now, so I guess that worked. Thanks for the help, I really appreciate being able to come here and be pretty sure someone will be willing to help out. sounds like you did fine, but just in case.. there should be 'bearing' grease on the gears in the gearbox, just not on/in the bronze bushings .. |
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