Shrink Fit calculations
Shrink Fit calculations
(OP)
I am currently working a new project that will require a shrink fit to be used in two places. Unfortunately I do not have any experience in using these. We are pressing a steel (S45C) worm on to a steel shaft (dont have material picked). The worm OD is .650 nominal and the shaft OD is .3150 -.0002 -.0004 (8mm G5 tolerance). Knowing the torque this will be subjected to (approximately 27 in/lbs) how do I determine the interference necessary between the components. I have a basic understanding of how much I will have to heat the worm to get the ID to expand, but I really don't understand how to calculate the pressure created by the interference or how to convert that into a max torque value. I certainly don't expect anyone to do the math for me, but any pointers would be appreciated. As a side note I do have a copy of the machinery handbook which gave me the interference fits required for FN 1-4 fits, but there is no numerical explanation of the holding strength of these fits. Thanks in advance.





RE: Shrink Fit calculations
RE: Shrink Fit calculations
In the index, look up Fits. You can find the correct subtopics below that one.
--Scott
http://wertel.eng.pro
RE: Shrink Fit calculations
RE: Shrink Fit calculations
Where,
δ = change in radius
R = radius at room temperature
α = coefficient of thermal expansion
T = elevated temperature
To= room temperature
Good luck.
RE: Shrink Fit calculations
Hi jeffcannon
Have a look at these sites:-
http:
http://www
http://www.tribology-abc.com/calculators/e6_2.htm
desertfox
RE: Shrink Fit calculations
RE: Shrink Fit calculations
This pdf might also help
RE: Shrink Fit calculations
Jeff -if you can get your shrink fit to work with a coefficient of friction of less than 0.2 then that is a great solution.
Cheers
Greg Locock
I rarely exceed 1.79 x 10^12 furlongs per fortnight
RE: Shrink Fit calculations
RE: Shrink Fit calculations
RE: Shrink Fit calculations
One more option is a micro welding or the worm to the motor shaft.
RE: Shrink Fit calculations
http: