force for press fit ?
force for press fit ?
(OP)
I'm trying to calculate the for required to press a 1/2 pin in to 1/2 hole... total interference will be 0.023" and the thickness of the receiving parts is 0.394. I was using the formula out of the machinery handbook P=(AxaxF)/2 where P is in tons, A is the area in contact between pin and holes surfaces, 'a' is the interference and F is some force factor. My problem is the handbook only gives F values for holes 1inch and over. Does anyone know what F factor I can use to give me the results I am looking for.





RE: force for press fit ?
Don
Kansas City
RE: force for press fit ?
RE: force for press fit ?
I agree with the others that there is to much interference.
But have a look at this site anyway:-
http:
regards
desertfox
RE: force for press fit ?
Cheers
Greg Locock
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: force for press fit ?
agree with the other posters about the interference ... if you really have to do this, consider how you're going to support the workpiece (to avoid damaging it)
RE: force for press fit ?
Tobalcane
"If you avoid failure, you also avoid success."
RE: force for press fit ?
RE: force for press fit ?
V
Mechanical Engineer
"When I am working on a problem, I do not think of beauty, but when I've finished, if the solution is not beautiful, I know it is wrong."
- R. Buckminster Fuller
RE: force for press fit ?
RE: force for press fit ?
Cheers
Greg Locock
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: force for press fit ?
RE: force for press fit ?
This may sound like a cop-out, but if I were you, I'd find a shop with a hand-crank hydraulic press (lots of machine shops have them)
http://ww
and press one in by hand and read the pressure gauge. You can calculate until you're blue in the face and still not get as accurate an estimate as this.
Don
Kansas City
RE: force for press fit ?
Provide some mechanical stop so the pin is not inserted too far.
Ted
RE: force for press fit ?
I was skeptical of the 0.023 inch interference fit until reading your last post. Typically these fluted areas are used on shafts for torque transmission. They add a little to the cost of the piece, but are effective as an anti-slip device in torque applications.
I've used Knurl before to buildup the shaft for a greater press fit, it does sort of the same thing but not as effective as the fluted barrel type like you have.
Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada