mjflinty
spending too much on rocks
Member since September 2011
Posts: 356
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Post by mjflinty on Mar 28, 2018 8:27:48 GMT -5
Thank you for the awesome write-up and pictures. You inspired me to rebuild mine too. I had the same wear on the shafts. It rolls so much better now with all new parts!
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salpal48
starting to spend too much on rocks
Member since March 2015
Posts: 136
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Post by salpal48 on Apr 7, 2018 19:06:58 GMT -5
Over the years , I have learned to rebuiled my tumblers . with Lortone 12 lb . the first thing I do is replace the Plastic bushing with Olite forever bronze bushing. they do make a size That just snap in . One you convert To Bronze They never ware Out
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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 8, 2018 9:13:18 GMT -5
Over the years , I have learned to rebuiled my tumblers . with Lortone 12 lb . the first thing I do is replace the Plastic bushing with Olite forever bronze bushing. they do make a size That just snap in . One you convert To Bronze They never ware Out Is this the Bronze bushing you are talking about fir the QT tumblers ? About to rebuild mine . . . www.amazon.com/gp/offer-listing/B006AWFBCO/ref=dp_olp_0?ie=UTF8&condition=all
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salpal48
starting to spend too much on rocks
Member since March 2015
Posts: 136
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Post by salpal48 on Apr 12, 2018 16:14:59 GMT -5
The Bronze bushing are direct copies Of lortone QT ^^ or QT!2. Go to ASB Bearing , and click Flange bushing Inch size ( bronze standard) not metric size # FF 620 or any of the 620-01's . Th e Inside diameter is.502 size and use the thinest Outside diameter . then length . . I use 5/8 length . They will just snap in with a little effort. there gogd forever. The 7/8 Outside diameter may be a little to Thick check the bearing web site Sal
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Post by aDave on Apr 12, 2018 17:34:33 GMT -5
The Bronze bushing are direct copies Of lortone QT ^^ or QT!2. Go to ASB Bearing , and click Flange bushing Inch size ( bronze standard) not metric size # FF 620 or any of the 620-01's . Th e Inside diameter is.502 size and use the thinest Outside diameter . then length . . I use 5/8 length . They will just snap in with a little effort. there gogd forever. The 7/8 Outside diameter may be a little to Thick check the bearing web site Sal Sal, Is this the one that you're using? I think it covers all of the parameters you listed. Thank you. asbbearingsonline.com/index.php?main_page=product_info&cPath=87_119&products_id=6647Wooferhound
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goatgrinder
spending too much on rocks
Make mine a man cave
Member since January 2017
Posts: 368
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Post by goatgrinder on Apr 12, 2018 19:05:25 GMT -5
Ah yes, the age of bronze I remember it well. Go Trojans!
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salpal48
starting to spend too much on rocks
Member since March 2015
Posts: 136
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Post by salpal48 on Apr 15, 2018 14:18:35 GMT -5
I have been Using FF620 or FF620-02. They just push in On mine but the out side flange has to be thin enough to Catch the retaining Ring Groove. The length does not mean anything . i prefer a 5/8 length Or 3/4" some lortone Older model or new . The hole size Is a little different. You can sand them down to fit on a bench sander If necessary Sal
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Post by rockpickerforever on May 1, 2018 12:12:41 GMT -5
I have been Using FF620 or FF620-02. They just push in On mine but the out side flange has to be thin enough to Catch the retaining Ring Groove. The length does not mean anything . i prefer a 5/8 length Or 3/4" some lortone Older model or new . The hole size Is a little different. You can sand them down to fit on a bench sander If necessary Sal
Had I known they were available, I would have gone with oilite bushings in a heartbeat! Thanks for the info! I have it bookmarked, maybe I should go ahead and pick some up to keep on hand? Who knows how long they will be available. I have a machine shop in my garage, thinning the outer flange down easy enough to do.
When I recently did the refurbish/overhaul/maintenance that I started this thread about, I wasn't paying attention putting it all back together, and installed the motor upside down (50/50 chance). I had already oiled the motor before putting it back on, so the fact that the oil holes were now inaccessible on the bottom not a big deal. Figured I'd turn it over when the batch that I was interrupting was complete. Like now.
Correct orientation of motor, with label and oil holes up. Someone had asked where the oil holes are located on their tumbler, I was wondering if their motor was mounted upside down as well? I had the advantage of already knowing where the were.
Closeup of left oil hole.
As for old/stretched/slipping belts, it had been discussed about elongating the motor mounting holes to enable the motor to be pulled tighter so the belt doesn't slip. I had already done that back when. A few pics to help clarify.
The thing I noticed when I took it apart to get some pics, was the center hole may also need to be elongated. Depending on how much you slot and tighten, the motor output shaft may rub on the sheetmetal (center hole). You can see that if you make it as tight as it can go, the center hole is a potential problem.
This is the new belt I just got for my QT12 from The Rock Shed, so I know it is the correct one.
I took a look at the drive pulley/sheave (call it what you will) on the output shaft of the motor, and wondered if the OD of the center of the groove had worn down from the belt slipping over time (I bought it used!), such that the belt is now too big for it? It does look like the belt rides about where it should (not all the way down in the groove), so maybe that is not it.
Rather than buy a longer belt (may not be possible to get one exactly the correct size), I was wondering if I shouldn't look into replacing/making a new pulley with a slightly larger OD. Doable.
Will let you know what conclusion I reach. Jean
ETA - The belt is turning the drive shaft (and barrel) just fine, no slipping. I'm not overly concerned with it at this time. In fact, I just started a new load last night!! Just something to keep in mind if/when it becomes a problem.
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Post by aDave on May 2, 2018 13:23:58 GMT -5
Nice additional detail Jean rockpickerforever. I find your comments about the oil holes interesting. This is right out of the QT12/66 manual in the maintenance section: I think when I first got mine, I saw the holes, but I also saw the notation in the manual. As such, I've chosen not to oil mine. The model number on my motor is the same as yours. Thoughts?
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Post by rockpickerforever on May 2, 2018 13:33:34 GMT -5
aDave , since I bought mine used, I did not get a manual. Even if I had, I would oil them anyway.
As a motor with moving parts, I see absolutely no reason why one would not oil it. Sparingly, maybe, but all motors with moving components (all of them!) can benefit from a little oil, IMHO. I don't expect it to make the motor run cooler, as I doubt friction is what causes the motor to run as hot as it does. But oiling can help prevent wear on the shaft and bushings.
I do it every time I start a load.
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Post by aDave on May 2, 2018 13:42:40 GMT -5
aDave , since I bought mine used, I did not get a manual. Even if I had, I would oil them anyway.
As a motor with moving parts, I see absolutely no reason why one would not oil it. Sparingly, maybe, but all motors with moving components (all of them!) can benefit from a little oil, IMHO. I don't expect it to make the motor run cooler, as I doubt friction is what causes the motor to run as hot as it does. But oiling can help prevent wear on the shaft and bushings.
I do it every time I start a load. Jean, I totally get that. This first came to pass, for me, when I saw a note about Thumlers motors needing oil. When I saw that, I looked to see if I had missed something about the Lortone motors. I started researching, and I seem to recall seeing something about the Thumblers motors having some sort of internal tube from the hole leading to where oil needs to get. Not sure if the Lortone had that same feature. I truly don't know. Hmmm...was johnjsgems involved in that discussion? Heck, if I get some down time, maybe I'll call Lortone and ask why they don't advise using oil to maintain the motors. Thanks.
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Post by rockpickerforever on May 2, 2018 15:28:38 GMT -5
aDave , I went hunting for info on the Lortone motors. Found an OLD thread from 2007 where to oil this tumbler? which includes a very detailed how-to on fixing a - Lortone 33B. Does not pertain to the QT12, but it did make mention of the motor in that one, and if it needs oiling. It was stated that it has a "skeleton" motor, and does not require oil. Maybe this is what you were remembering?
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Post by aDave on May 2, 2018 15:53:41 GMT -5
Jean rockpickerforever , I did some searching as well. I didn't see that thread but found another that referred to the skeleton motor not needing oil. I think those motors are on the 33 series and 45C. I found a reference on another website about oiling the Fasco motors on Thumlers tumblers, but on the same site, there is nothing about oiling Lortone motors. Just before I saw your post, I had gotten off the phone with Lortone, and there is a possibility we are both correct. According to the gal I spoke with, the current Fasco motors that are used on QT12/66 tumblers do not require oil, and they are not designed to be oiled. Specifically, she said there are no oiling ports on these motors. She did say that the shaft could be periodically oiled if not excessive. But, there is a risk of gunk buildup in the internals just by dropping oil into the housing. That said, she did mention that "older" motors for the tumblers may have been specifically designed for oiling, but she could not say for sure. She also added that even though the Thumler's Fasco motors look similar to the Lortones, they are completely different, as Fasco builds these motors specifically for Lortone. So, considering the age of your tumbler (old blue color on the chassis), maybe yours would be considered an "older" motor. Don't know. I guess we just keep carrying on.
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salpal48
starting to spend too much on rocks
Member since March 2015
Posts: 136
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Post by salpal48 on May 2, 2018 21:21:36 GMT -5
I have found a few drops of oil. on any motor will work well. . the biggest drawback with these small motors is When they intake air to cool they gather dust with it. weather the motors require oli or not The dust sticks to fans, coils and rotors. this will case your motor to run hotter than normal. any motor can get gunked up. to solve this problem. remove the motor and soak and submerge in mineral sprits overnight. then let air dry and oil. If you dunk it up and down , you will be shocked the amount of soot and dust is @ the bottom of the bucket. DO NOT PLUG IN WHILE SUBMERGED IN THE MINERAL SPIRITS . this will prolong the life of your motor. I have used this process with small motor and Up to 1/2 HP
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