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Post by Jugglerguy on May 31, 2016 15:35:15 GMT -5
I have a Lorton ST-10 saw. A few weeks ago, I thought it had bad bearings because it was making a lot of noise. I cleaned out the saw, starting taking parts off, and then noticed that it was the larger pulley on the arbor shaft that was loose. I tightened it up and it was nice an quiet again, but only for about two cuts and it loosened up. I took the screw out and cleaned it well and applied a small amount of blue Loctite thread locker. Again it loosened up right away. So this time I cleaned the screw and pulley again and applied Loctite much more generously. I didn't use the saw for a couple of weeks, so it was fully cured. This time it was making noise by the end of the first cut.
The arbor shaft has a flat spot that I'm tightening the set screw. It's well worn in that area from being loose and moving around. When the set screw is tightened, it's down into the hole a bit. Is it possible that the shaft is so worn that the set screw doesn't have enough threads to tighten properly? It feels like it's tight when I use an allen wrench on it. Should I try to find a longer set screw? is there some other trick to try?
Thanks for any help you can give me.
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Deleted
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Post by Deleted on May 31, 2016 15:58:43 GMT -5
Loctite is water/saccarin based. Is there any oil in the female threads?
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Post by Jugglerguy on May 31, 2016 16:02:07 GMT -5
I cleaned it up with some carburetor cleaner that says it cleans metal. I let it dry well. It's outside the saw, so it's not really oily anyway. Is there a better thread locker or a better method of tightening it?
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Deleted
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Post by Deleted on May 31, 2016 16:10:16 GMT -5
I cleaned it up with some carburetor cleaner that says it cleans metal. I let it dry well. It's outside the saw, so it's not really oily anyway. Is there a better thread locker or a better method of tightening it? We have to wait for the real mechanics around here. jamesp, Rockoonz, quartz, jakesrocks, @rr |
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jamesp
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Post by jamesp on May 31, 2016 16:27:29 GMT -5
I am not a fan of small set screws. If the speed is not too fast and you have space an allen head bolt can be a good replacement. There should be a flat spot on the shaft to seat the set screw. Understand if it gets gouges the shaft. Some sheaves/pulleys don't have a good fit and are determined to loosen up. I sure do like taper lock equipped sheaves/pulleys. Especially in rusty on lapidary environments. They do not know how to come loose, and about impossible to rust to the shaft. Rob's saw sheave may be too small for a taper lock sheave.  |
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Post by woodman on May 31, 2016 17:20:31 GMT -5
Check the fit of the pulley to the shaft. If it is loose, you will have a problem. If loose, check the diameter of the shaft. You may get by with replacing the pulley. They do make longer set screws.
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Post by Peruano on May 31, 2016 17:24:32 GMT -5
Sometimes you just need a longer set screw. And yes Loctite is a lapidary's best friend on pulley set screws. Replacing the pulley may be the solution . . . if its slightly wobbley, it will work that set screw harder than a true running one. I think. Tom
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Post by Rockoonz on May 31, 2016 17:31:49 GMT -5
Yep, what woodman said. My 12" Lortone had a wonky pulley and the arbor shaft is gouged by the set screw. I replaced the pulley and put it on backwards so the set screw is on the other side. I filed a flat onto the shaft and heavily doused the setscrew in Loctite, since the next rebuild will include a new arbor shaft and the Loctite releases easily with the blue tip propane wrench. |
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Post by Jugglerguy on May 31, 2016 19:46:42 GMT -5
I just bought a new pulley and it fits much tighter on the shaft. I completely removed the set screw on the old pulley and a piece of metal, like a thread from the pulley, came out with it. So that pulley was completely shot. I also bought a longer set screw so that more threads will be in contact and have more surface so smear Loctite on. I'm pretty sure that should fix it. Now I just have to wait for it to dry. James, I didn't know where to find your taper lock pulleys or I would have tried one. Thanks for the help everyone.
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jamesp
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Post by jamesp on May 31, 2016 20:14:44 GMT -5
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Post by toiv0 on May 31, 2016 20:24:28 GMT -5
sounds like you got it. You can get taper locks at any major bearing company, Kaman, Applied, Berry Bearing. I am not sure if they have fractional sizes. The set screws are usually made from a harder steel than the shiv or shaft and has little barbs on the end to bite the shaft so they wont back out. Sometimes after a being taking them apart a few times they wear smooth, another trick we use for bearing and staight bored pulleys is to put the Loctite onto the shaft itself. When we do this on a bearing the shaft won't spin on the inside the inner race when it fails and most of the time the shaft is saved. It also helps the straight bore pulleys an extra hold if the set screw gives. Hardly ever use it on the set screws theirselves unless I forget the loctite on the shaft. Then I pour it down the set screw hole. To release loctite a little heat goes a long way.
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Post by toiv0 on May 31, 2016 20:28:39 GMT -5
Grainger has QD and Taper locks. I seen the taper locks down to 1/2 inch
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Post by Jugglerguy on May 31, 2016 20:32:04 GMT -5
Thanks Toivo. I'll try it on the shaft if this doesn't work.
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Post by spiceman on May 31, 2016 22:51:32 GMT -5
If you use Loctite, don't use "red" or " green"
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Post by Garage Rocker on May 31, 2016 23:07:52 GMT -5
I can't believe it's gone this long and not one comment about you having a screw loose. Where did all the wisecrackers go?
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Post by Jugglerguy on Jun 1, 2016 5:20:37 GMT -5
I can't believe it's gone this long and not one comment about you having a screw loose. Where did all the wisecrackers go? You're sort of new here. My loose screw was obvious to everyone else a long time ago. |
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jamesp
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Post by jamesp on Jun 1, 2016 7:12:09 GMT -5
A known
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Post by Garage Rocker on Jun 1, 2016 7:32:31 GMT -5
I can't believe it's gone this long and not one comment about you having a screw loose. Where did all the wisecrackers go? You're sort of new here. My loose screw was obvious to everyone else a long time ago. I reckon. Looks like someone even sold you a couple bicycles with only one wheel. Saw 'em hanging in your garage.  |
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Deleted
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Post by Deleted on Jun 1, 2016 9:55:10 GMT -5
You're sort of new here. My loose screw was obvious to everyone else a long time ago. I reckon. Looks like someone even sold you a couple bicycles with only one wheel. Saw 'em hanging in your garage. Seems like we got ourselves a new 'wisecracker'. Welcome, amigo! |
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jamesp
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Member since October 2012
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Post by jamesp on Jun 1, 2016 16:29:22 GMT -5
You're sort of new here. My loose screw was obvious to everyone else a long time ago. I reckon. Looks like someone even sold you a couple bicycles with only one wheel. Saw 'em hanging in your garage. Rob's rotary only has one shaft. |
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