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Post by HankRocks on Mar 31, 2018 5:45:59 GMT -5
The Belt on one of my Thumler's Model B tumblers is slipping, the motor shaft with pulley turn but belt slips. The drive shaft turns fine without the barrel, once barrel is added it stops after a minute or two. Checked the both the driven shaft and the non-driven shaft, everything seems ok. Cleaned both pulleys with Acetone, no change. Is there anything I can use to increase the belt friction?
Thanks
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,154
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Post by jamesp on Mar 31, 2018 5:51:37 GMT -5
You may laugh. Been using this stuff for years. Dozens of manufacturers. Can be bought at most automotive stores. Got a little 6 ounce spray can, had it for 20 years and have used it many a times to get jobs finished till repairs can be made.
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Post by johnjsgems on Mar 31, 2018 9:07:10 GMT -5
I assume you tried adjusting belt tighter? Never heard much of an issue with Thumler's belts stretching like Lortone but maybe.
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Post by HankRocks on Mar 31, 2018 12:44:07 GMT -5
No adjustment on the Thumler's Model B, or at least none that I see. Just picked up a can of the CRC Belt Conditioner so will test shortly.
Thanks
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braat
spending too much on rocks
Member since December 2016
Posts: 350
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Post by braat on Mar 31, 2018 15:00:17 GMT -5
Sounds like you got another Model B? Maybe try swapping belts and see what happens. Also cleaning the belt may help...pull the belt through a white cloth/paper towel between pinched fingers a few times until it's clean. I have to do this from time to time with my Lortone 3A.
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charles kuchar
spending too much on rocks
getting ready for the second coming
Member since November 2010
Posts: 300
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Post by charles kuchar on Mar 31, 2018 19:35:33 GMT -5
thanks for the tip on the belt tightening locktite. sometimes my model b's will slip. I usually try to clean the belts but once in a while I have found a little crack in it and it stretches a little more a slips. I do keep extra belts on hand for both my thumblers and lortones. chas
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Post by HankRocks on Apr 1, 2018 6:06:35 GMT -5
Ok Test run went about 10 hours, no slippage. Was going to let it run overnight but hit the wrong switch and it got turned off. The Belt was very tacky to touch this morning so it seems the CRC - Belt Conditioner is working as advertised. Will run continuously for the next 3 or 4 days before cleanout. jamesp, Thanks for the tip
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,154
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Post by jamesp on Apr 1, 2018 6:33:01 GMT -5
Glad it worked for you Henry. Our wet red clay is slick, used to get in v-belts on off-road vehicles and slip belts even with a fair amount of tension. Belt dressing was always in the tool box.
Another substance that will slip belts in a hurry is graphite dust.
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Nappers
off to a rocking start
Member since November 2017
Posts: 17
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Post by Nappers on Apr 1, 2018 10:02:44 GMT -5
I've used that Walmart brand brake cleaner on rubber bits to clean them. Usually works good. My rubber mallets love it. I clean them up and the rubber is good as new. That stuff melts some plastics and strips paint. So be careful with it!
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braat
spending too much on rocks
Member since December 2016
Posts: 350
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Post by braat on Apr 12, 2018 23:18:58 GMT -5
I bought a can of belt dressing to see how it would work on my Lortone 3A and I'm a believer now. Before application slight finger pressure on rotating barrel would cause belt slip... after application same finger pressure causes barrel to "climb" out of the tumbler so the belt dressing works good (I was skeptical)...only thing now is to see how long one application lasts. So for the next while I'll do the finger test on my weekly clean outs...thanks to jamesp for the tip!
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agatemaggot
Cave Dweller
Member since August 2006
Posts: 2,195
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Post by agatemaggot on Apr 13, 2018 0:21:13 GMT -5
I tried several brands of belt dressing on my gang drill set-up. After a couple weeks I would have to re-apply because of the slippage. One night about 2 A.M. the belt on one of my presses started to slip and the drill bit would stop cutting. Looked all over the shop, we are all out. Only thing in the stock room that might work was a spray can of 3M spray adhesive, what the HEY, I have to get this order out and if the belt gets eaten up I can get another belt across the street at a Bering sales store when it shoots Craps on me. That belt has been going strong for 9 years now and the other 2 drill presses have new belts that have were treated the same way as soon as they were replaced ! I spray the adhesive directly into the V on the drive pulley when it is running.
CAUTION ----- DON'T put your damn nose up close to the pulley to inspect the spraying process because the excess adhesive spinning off the running pulley is a real pain to remove from the lenses of your safety glasses !
You really don't have to ask me how I know THAT !
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braat
spending too much on rocks
Member since December 2016
Posts: 350
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Post by braat on Apr 13, 2018 12:34:12 GMT -5
I tried several brands of belt dressing on my gang drill set-up. After a couple weeks I would have to re-apply because of the slippage. One night about 2 A.M. the belt on one of my presses started to slip and the drill bit would stop cutting. Looked all over the shop, we are all out. Only thing in the stock room that might work was a spray can of 3M spray adhesive, what the HEY, I have to get this order out and if the belt gets eaten up I can get another belt across the street at a Bering sales store when it shoots Craps on me. That belt has been going strong for 9 years now and the other 2 drill presses have new belts that have were treated the same way as soon as they were replaced ! I spray the adhesive directly into the V on the drive pulley when it is running. CAUTION ----- DON'T put your damn nose up close to the pulley to inspect the spraying process because the excess adhesive spinning off the running pulley is a real pain to remove from the lenses of your safety glasses ! You really don't have to ask me how I know THAT ! And I just happen to already have a can of the 3M spray adhesive so I'll give that a go if/when the belt dressing route gets too repetitive. Tks for the tip and I WILL wear safety goggles ... Don't want to get that stuff on my expensive prescription eyeglasses... P.S. I see I'm a two star/ fully eguipped for tumbling member now...woohoo I'm a somebody now...only a billion more posts to catch Jamesp
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Wooferhound
Cave Dweller
Lortone QT66 and 3A
Member since December 2016
Posts: 1,423
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Post by Wooferhound on Apr 14, 2018 7:27:24 GMT -5
I bought a can of belt dressing to see how it would work on my Lortone 3A and I'm a believer now. Interesting you mention the 3A tumbler. The belt has been slipping on my 3A machine too, the belt tension adjustment was maxed out. The tension is changed by sliding the motor-mount screws in long slots making the belt tighter. Yesterday I took the cover off the 3A and drilled the slots another 1/4 inch longer to get more ability of adjustment. The belt that came with the machine lasted over a year before I refurbished and changed the belt. The Rock Shed had sent a spare belt and i used it to replace the first one. The new belt lasted 3 months and is stretched enough to require me to modify my machine. I kept the old belt and thinking about changing it back to the original. Interesting thoughts about using 3M on the 3A .
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Post by grumpybill on Apr 14, 2018 8:57:24 GMT -5
Interesting you mention the 3A tumbler. The belt has been slipping on my 3A machine too, the belt tension adjustment was maxed out. The tension is changed by sliding the motor-mount screws in long slots making the belt tighter. Yesterday I took the cover off the 3A and drilled the slots another 1/4 inch longer to get more ability of adjustment. I've found that there's barely enough adjustment range on my 3A and 33B frames to properly tension brand new belts.
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gregniel
off to a rocking start
Member since February 2020
Posts: 24
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Post by gregniel on Aug 12, 2021 10:38:43 GMT -5
A great fix for this is putting a O-ring such as a 9/16 in. OD x 3/8 in. ID x 3/32 in. wall thickness around the motor pulley wheel and then putting the belt over this. This will stop the spinning.
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dirtybill
off to a rocking start
Member since August 2021
Posts: 13
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Post by dirtybill on Aug 13, 2021 16:06:36 GMT -5
I have an almost 40 yr old Model B. The original belt gave out after the 1st year. There was no internet then, so I went and got a fatter vacume cleaner belt. That belt is still running strong. Not a lot of rock batches, but many thousands of ammo casings. Just started a batch of rocks today, and no hiccups.
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gatorflash1
spending too much on rocks
Active in Delaware Mineralogical Society, Cabchon Grinding and Polishing, 2 Thumlers B's and a UV-18
Member since October 2018
Posts: 375
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Post by gatorflash1 on Aug 16, 2021 13:06:47 GMT -5
I've gone through a bunch of belts, buying them by the dozen, cheap. One of the things I do is to make sure the belts are very clean between stages, and making sure the pulleys are straight and very clean. The Mod B moves a lot of weight.
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dirtybill
off to a rocking start
Member since August 2021
Posts: 13
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Post by dirtybill on Sept 3, 2021 9:11:09 GMT -5
My vacume cleaner belt finally gave up after many years. I ordered a 10 pack of "replacement" belts for my Model B from Ebay. I found them to be very pliable and fresh when opening the package. After 2 days of running, I noticed a slight drop in my barrel RPM's. I went a bit further on the previous post using O rings. I put 2 #8 O rings next to each other on the drive pulley (9/16 OD x 3/8 ID X 3/32). These form a V groove for the drive belt to center on. After another week, I inspected everything b4 starting a wash cycle. The O rings formed a "tire" with a cupped center radius. New belt tracks perfectly, and have a slight increase in barrel RPM's, which I expected. I did try to obtain another vacume cleaner belt, but unfortunately, no longer available. Now days they give model # of vacume, and not belt dimensions. On a further note, I bought a USB rechargeable desk fan. I have it a few inches away from the motor. My old Model B motor was getting pretty hot to the touch. Now it's just mildly warm. I'm hoping this adds to belt life as well.
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dirtybill
off to a rocking start
Member since August 2021
Posts: 13
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Post by dirtybill on Sept 3, 2021 14:15:58 GMT -5
I did a little online tracking. Came up with some info posted on this forum a long while back. Seems another member checked out the reloading forums that mention the High Speed Model B and belt issues. Here is the info regarding belts: "The O Ring Store" Their part # E70343 is the belt that they are all using with really good life expectancy. Now they have 2 available with the same I.D. Not sure if there is any difference as far as our use other than price. I'm awaiting an email reply from the O Ring Store regarding that. Also,there is a vacume belt available on Amazon that also fits. It is a bit thicker and gives great wear as well. Probably the one I had for many years. That item is a 3 pack belts for Eureka and Sanitaire upright vacume. Part # 3056352100 @ $5.29 / pack. It was also mentioned that these O rings and belts fit several Thumler and Lortone tumblers. Hope this helps! I will definitely order a few of each. Just discovered these same belts are available at Walmart straight off the shelf if you need them in a hurry.
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Chris Sikk
having dreams about rocks
Member since September 2021
Posts: 73
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Post by Chris Sikk on Sept 16, 2021 16:04:49 GMT -5
Certainly going to try this o-ring trick in the future, if my Thumler survives. I was about to drill a new hole for tension as someone else mentioned. The Rock Shed belts said they fit my machine but after one batch it started slipping. On a hunch, I grabbed the old belt that I held onto and put it back on, the machine runs like a champ. When the belt gives it will be time to revisit this thread and MacGyver.
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