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[email protected] etpm@whidbey.com is offline
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Default Press fit and heat treatment question

On Wed, 29 Feb 2012 14:22:37 -0800 (PST), andrew
wrote:

Thanks for all the suggestions. I wanted to let you know where I am

Firstly: Here is picture of the machine almost identical to the one I
have; http://www.aaronequipment.com/usedeq...pz-ii-43905001
If you look through the pictures, you can see that there are two
plates with pins - one fixed and one rotating. It was the pins on the
rotating plate that I ruined by heating to 600C. The pins go through
the rotating plate

Well, I initially tried Loctite in the gaps and epoxy on the back side
- but the loctite did not cure and I did not have all the pins at
exactly the same height, so it was scraping on the fixed plate and on
the back side when rotating (the gaps are just a few mm's on both
sides of the plate). So I burnt everything off in the oven - again
and used just 2 part epoxy very liberally on the back side - all over
the pins and plate. The back side does not see the chips that are
grinding

So far after about 10-20 runs at~5000rpm, it seems to be holding - all
the pins are still tight. SInce the gaps are so tight, there is no
danger of the pins falling out, so I thought I can take the chance
with this approach for now. I am not really a machinist to be able
to rework the part and I do not know enough metallurgy to know what
kind of heat treatment would work so this seemed to be the only
approach for me

Thanks again

Andy

Greetings again Andy,
After thinking about Loctite I remembered that whenever I used it with
stainless steel assembly I always used a primer because otherwise the
Loctite would cure very slowly or not at all. Maybe that's why it
didn't work for you.
Eric