Thread: Pressure Fitted pins

good idea questions is this. that pin should cool off then it will come to is it original size right? will get loose? or i am missing something?

Originally Posted by hi_bud_gl

good idea questions is this. that pin should cool off then it will come to is it original size right? will get loose? or i am missing something?

yeah, that too

NO... you dunk the pin in liquid N2 so it contracts. You then insert it. as it warms it grows slightly, which will then pressure it in place.
I said 1/16" as an example. One would have to figure out the hole sizes etc. On the converse, or at the same time, the scales could be heated and then they would shrink down on the pin, further pressure fitting it. Just to be clear, the pins would not fit in the hole in this scenario, unless they were shrunk or the holes enlarged. Thats the way a press fit works. And yes, exact hole sizes are press fits. Typically a 1/16" bit drills a "clearance" hole that is actually around .01 wider than the actual width to prevent press fits.

This may work but how much pin will shrink by cooling? do you think that amount will be good enough? i can't say .Someone needs to experiment this and let us know the result.

I think the interference fit of the pin would have more side ways splitting pressure on the scales than that of a washer pressing in from the side.


Charlie