neural
starting to spend too much on rocks
Member since November 2019
Posts: 129
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Post by neural on Apr 30, 2023 14:56:41 GMT -5
Disassembled a cab machine I have because it was having issues related to bearings. Was vibrating. Additionally I wanted to get it apart to clean it up and make some changes. Problem is that the pulley is jammed on there. Have tried PB Blaster, WD-40, etc. I can brute force it to rotate, but that's already marred the axle enough as it is. Looking for suggestions on how to get it out of there before I simply look for a way to cut it off. This machine is pretty much dead in the water at this point because of the penetrating lubricants used, as the bearings need to be cleaned now etc. Fortunately I'm not using the machine very much right now as it is, but even if the bearings were just fine, I'd be S.O.L. if the belt ever needed to be replaced. Anyone know of any tools made that could be used to get the pulley moving?
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Post by Rockoonz on Apr 30, 2023 15:37:16 GMT -5
Did you make sure it doesn't have 2 set screws? The pulleys I buy do. Take setscrews all the way out if you haven't already, they make good reservoirs for penetrating oil. Heat is usually the answer when all other means are exhausted if you can keep it focused on just the pulley. With those Lortone units you want to keep the heat away from the bearing cups, there may be rubber cushions in them depending on the age of the machine, usually the reason for vibrations and probably NLA from Lortone. Also if there are any rough spots on the shaft sand them smooth before sliding the pulley across them,
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gunsil
spending too much on rocks
Member since January 2023
Posts: 337
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Post by gunsil on May 1, 2023 7:22:31 GMT -5
If that's a die cast zinc alloy pulley rather than a cast iron one you gotta be careful not to melt it with heat but careful heating might be the trick. Lightly tapping with a fiber mallet or hammer will help the PB Blaster penetrate. If it's an iron pulley you can use a brass hammer to tap it.
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neural
starting to spend too much on rocks
Member since November 2019
Posts: 129
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Post by neural on May 1, 2023 11:34:31 GMT -5
Pretty sure it's a zinc alloy pulley. I'm most worried about damaging the shaft trying to get the thing off of it. As for rubber cushions in the bearing cups, that may be why I was running into issues with it not running true. This is annoying, and I can clearly see now why some people don't like this particular design.
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Post by Rockoonz on May 1, 2023 12:53:33 GMT -5
Lortone changed them to flange bearings on the latest machines, would be a good upgrade. Amazon has good prices on steel pulleys, I replace all the alloy ones when I rebuild saws and equipment. If you completely remove all your setscrews there won't be anything there harder than your shaft so you won't damage it more than it already is. I would remove all the setscrews from the bearings as well, and just focus on pulling the shaft out one end without unbolting the bearings from the unit, at least to begin with. I have a collection of pieces of 1" and larger black pipe, washers, and a couple large flanges that I stack up over the shaft and use the shaft nut on the right side threads to jack the shaft off, leftovers from specialized bushing presses I built years ago. It can look pretty redneck but I have never damaged anything doing it. Just watch the bearing on the opposite side and make sure the shaft is sliding through it, and when any burrs become visible sand them off before proceeding.
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gunsil
spending too much on rocks
Member since January 2023
Posts: 337
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Post by gunsil on May 1, 2023 17:26:15 GMT -5
Using pipe and the nut on the shaft is a great idea! I'm and old retired mechanic and have gear pullers with up to 14" reach for transmission work I can use but your idea is so simple and easy! Naturally I have a bunch of steel tubes for pressing gears and bearings back on so I'm all set to use your method on lapidary shafts should I ever need to. Screw press, ingenious! I will admit I am a big fan of the torch and hammer method of making things move but it takes a lot of experience to not damage parts.
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