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thread lock problem

MRunik (Mechanical)

(OP)

5 Mar 03 00:35

Hi everybody I'm new here, and have a question that I sure would appreciate some input on. I need to find a cold or low heat way to permanently bond an adjustable machine handle with inside threads, to a threaded tool shaft. I need to twist the handle clockwise and counter clockwise with quite a bit of pressure, so the threaded parts need to be locked together tight, and permanent. I know high strength red Lock Tight isn't strong enough for this. Maybe a thin bodied 2 part epoxy? Does anyone have any ideas here? Thanks for any help.

atad (Aerospace) · Answer 1 · 2003-03-05 07:39:22

Would it be possible to fit the handle, cross drill the joint then fit a spirol or spring pin?

MRunik (Mechanical) · Answer 2 · 2003-03-05 11:30:38

I wish I could. The problem is the female threaded portion of the handle is covered by the handle housing. The only way is to lock the threads together chemically. I thought of a low temp solder, but it might weaken a spring that is also in the housing. A thin, two part epoxy seems to be the best solution, but I don't know which to use, or if there is a better solution. Thanks Atad.

Mandrake22 (Mechanical) · Answer 3 · 2003-03-05 15:23:45

Sounds like it's time to make a call to Loctite. You may be correct that an anaerobic type product won't work but they will be able to recommend something that will.

EdDanzer (Mechanical) · Answer 4 · 2003-03-06 10:59:22

If an anaerobic plastic (Loctite) doesn’t work you may have to change the thread size. There is a company that makes a tap with a self locking thread.
Another method is to extend the thread through and lock the back side with a nut.
If the handle does not have any bearing, put bearings in it to reduce the torque on the threads.
If you make a handle or buy one from someone there should be a shoulder larger than the threads to work best.
Carr Lane and Fairlane sell handles, as well as others, I can’t remember the name of the company that makes the tap for thread locking.

dvd (Mechanical) · Answer 5 · 2003-03-06 23:07:41

You could drill and tap the end at the interface between internal and external threads and install a setscrew. Use the loctite there if you want.

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