matty h
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| posted on 4/8/17 at 08:45 PM |
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Theadlocker
I am after a thread locker that is the closest thing to been permanent.
The reason I want it is to lock a push bike cassette onto the back wheel but I am using it to mount a disc brake on my gravity racer spun a few off
now using loctite 270. So need to withstand high torques trying to undo it when the brakes are applied.
Any suggestion jb weld etc.
Matty
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minitici
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| posted on 4/8/17 at 08:52 PM |
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Forget the "JB" bit just "weld" ...........
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matty h
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| posted on 4/8/17 at 08:56 PM |
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Problem is welding Chinese steel to Chinese Ali.
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adithorp
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| posted on 4/8/17 at 09:08 PM |
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Old style screw on cassette..? So the disc screws on? If it has to screw on then you realy need a fixed wheel hub that has a thread for the sprocket
to screw on and then a slightly smaller left hand thread for a lock ring. If you can't use one of those then the old poor mans fixed trick to
fit a fixed sprocket to a freewheel hub. Then to stop it unscrewing when back pedalling, use a bottom bracket (pre cassette bearings) lock ring on top
of the fixed sprocket.
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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britishtrident
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| posted on 4/8/17 at 09:39 PM |
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Loctite has special grades for fine threads, the normal grades tend not to penetrate fine threads.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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coyoteboy
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| posted on 4/8/17 at 10:07 PM |
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Just clean it up completely and epoxy the whole thing inside the threads. Most of the really strong threadlocks are epoxies or cyanoacrylates.
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matty h
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| posted on 5/8/17 at 06:46 AM |
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Correct I have used a cassette to make a hub adapter to mount a disc. All is good on one side as it tightens it but other side unscrews.
Any recommendations on which epoxy or locktite to use.
Matty
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adithorp
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| posted on 5/8/17 at 08:13 AM |
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So twin discs on a double sided (threaded for sprocket both sides) hub? I'm amazed that a double sided hub doesn't have a (second, l/hand)
lock ring thread on one side for fixed wheel. Never seen one that didn't.
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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SPYDER
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| posted on 5/8/17 at 10:09 AM |
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More years ago than I care to remember we were experimenting with "offsetting" the cylinder head on our racing TR4 engine. Our head
specialist, Peter Burgess, had had good results on his flowbench. We duly machined the stud holes in the block out to a larger diameter and glued in
cast iron plugs using Loctite 648. The plugs were then drilled and tapped offset by 2mm. Might have been 3mm. The new hole cut through the side of the
plugs leaving behind crescent moon shaped remnants of the plugs. I said it wouldn't work. But it did!
So I can thoroughly recommend LOCTITE 648.
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