I'm working on a piece of pharmaceutical equipment that has a minor mechani cal problem. There's an aluminum piece about 1" x 1/4" x 1/2" that fits on a steel shaft. The aluminum is split and tightened with a set screw. The pr oblem is that the hole in the AL is somewhat buggered, and I can't tighten the setscrew enough to get a really solid grip. I can't shut the machine down long enough to do a proper repair, so I was t hinking that I could just glue the sucker in place. Ordinarily, I'd think t hat even green loctite 290 would do the job without any disassembly, or eve n just some "Crazy glue". The problem is that neither of them is food safe, and rules are rules. I have found several silicones that are food safe, but they all have curing times measured in tens of hours. The most they'll tolerate here is more li ke ten minutes, during a lunch break or shift change. So... any suggestions?

nical problem. There's an aluminum piece about 1" x 1/4" x 1/2" that fits o n a steel shaft. The aluminum is split and tightened with a set screw. The problem is that the hole in the AL is somewhat buggered, and I can't tighte n the setscrew enough to get a really solid grip. thinking that I could just glue the sucker in place. Ordinarily, I'd think that even green loctite 290 would do the job without any disassembly, or e ven just some "Crazy glue". The problem is that neither of them is food saf e, and rules are rules. ng times measured in tens of hours. The most they'll tolerate here is more like ten minutes, during a lunch break or shift change. I assume that taking it apart to put in a helicoil or Keensert takes too lo ng. What about making a replacement part complete with keensert and just remove and replace. Might be faster than putting a keensert in the existing part . There is crazy glue used in place of stitches in surgery. Don't know if it is food safe, but I would...

food safe instant glue?

Oct 25, 2015 21 Replies

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Cydrome Leader 10 years ago

Add some shim stock to get a tighter fit around the shaft? I use cut up pop cans from the trash.

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Bob Engelhardt 10 years ago

Have you done the numbers? If you drill it to 3/8, that will only leave

1/16 on each side and the drilled-out plug will only have a 1/16 wall.

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