Press fit bushing, How do I calculate bushing ID after press fit
Press fit bushing, How do I calculate bushing ID after press fit
(OP)
I am trying to calculate how much a steel bushing that is press fit into a steel housing will shrink on the ID so that i can tolerance the shaft that goes through it properly. I have not had any luck finding this calculation.
Thanks,
Kurt
Thanks,
Kurt





RE: Press fit bushing, How do I calculate bushing ID after press fit
Heckler
Sr. Mechanical Engineer
SWx 2007 SP 3.0 & Pro/E 2001
XP Pro SP2.0 P4 3.6 GHz, 1GB RAM
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(In reference to David Beckham) "He can't kick with his left foot, he can't tackle, he can't head the ball and he doesn't score many goals. Apart from that, he's all right." -- George Best
RE: Press fit bushing, How do I calculate bushing ID after press fit
In the calculation to determin the pressure between the bushing and the bore there is a variable for the radius after it is pressed into the bore. The book i have is assuming that the bore will move the same amount as the bushing wall (the reference is for thick walled cylinders) but what if the bushing wall is thin and the housing of the bore is very thick. It seems to me that the bushing would shrink more than the bore would expand. This would change my radius after assembled and the answer to the stress equation.
Is this a bad assumption? Can it be calculated differently?
Thanks,
Kurt
RE: Press fit bushing, How do I calculate bushing ID after press fit
This is an application that automotive uses all the time in steering columns. We would press a split ring steel bushing into a houseing and then put a bolt through that. 99& of the time your thermal expansion is negligible. I might also reccoment if you are using this in a rotation situation, use a steel mesh bushing with a PTFE coating to reduce friction. you will save your self a bunch of head aches.
RE: Press fit bushing, How do I calculate bushing ID after press fit
Thanks,
Kurt
RE: Press fit bushing, How do I calculate bushing ID after press fit
Heckler
Sr. Mechanical Engineer
SWx 2007 SP 3.0 & Pro/E 2001
XP Pro SP2.0 P4 3.6 GHz, 1GB RAM
NVIDIA Quadro FX 1400
o
_`\(,_
(_)/ (_)
(In reference to David Beckham) "He can't kick with his left foot, he can't tackle, he can't head the ball and he doesn't score many goals. Apart from that, he's all right." -- George Best
RE: Press fit bushing, How do I calculate bushing ID after press fit
Heckler
Sr. Mechanical Engineer
SWx 2007 SP 3.0 & Pro/E 2001
XP Pro SP2.0 P4 3.6 GHz, 1GB RAM
NVIDIA Quadro FX 1400
o
_`\(,_
(_)/ (_)
(In reference to David Beckham) "He can't kick with his left foot, he can't tackle, he can't head the ball and he doesn't score many goals. Apart from that, he's all right." -- George Best
RE: Press fit bushing, How do I calculate bushing ID after press fit
RE: Press fit bushing, How do I calculate bushing ID after press fit
This is the application.
I have a steel pin going through a steel housing. the end of the pin is seeing a load that is perpendicular to the axis of the pin and the bore is wearing out. the pin does not rotate or slide in the bore. The addition of the new hardened steel bushing is to strengthen the bore so it does not wear out due to the over hung load. i am actually using the inner race of a needle bearing as the bushing.
We want the bushing to be Press fit and the pin to be a tap of tight slip fit.
Thanks kurt
RE: Press fit bushing, How do I calculate bushing ID after press fit
I'll try that
RE: Press fit bushing, How do I calculate bushing ID after press fit
RE: Press fit bushing, How do I calculate bushing ID after press fit
Areabefore = Areaafter
A = π(r2o - r2i)
http://www.EsoxRepublic.com-SolidWorks API VB programming help
RE: Press fit bushing, How do I calculate bushing ID after press fit
RE: Press fit bushing, How do I calculate bushing ID after press fit
No we are just using the inner race like a steel bushing. These are very hard and come with thin walls and a large variety. Why do you think this design will have problems?
Thanks,
Kurt
RE: Press fit bushing, How do I calculate bushing ID after press fit
to the tick's post ... yes, a simple way to determine the radius change is to say that it equals the physical interference before installation ... you make the ID of the hole slightly smaller than the OD of the bush (or bearing), LN freezes the part, shrinking it, allowing it to fit into the hole.
RE: Press fit bushing, How do I calculate bushing ID after press fit
RE: Press fit bushing, How do I calculate bushing ID after press fit
If you can make a design change, you should. We had issues with bushings such as what you are using at my last place of employement. They tended to rip, and deform extensively in production. We were forced to change, and this company came to our rescue.
RE: Press fit bushing, How do I calculate bushing ID after press fit
If you really need to tightly control the ID of a press-fit bushing, select one that is undersize, and ream after it is pressed in place.
RE: Press fit bushing, How do I calculate bushing ID after press fit
We used quite a number of this type bushing in some of our machinery,
http://w
RE: Press fit bushing, How do I calculate bushing ID after press fit
Have you used the www.engin
Do you know what is meant by the inerface diameter (in the outer body parameters)?
and
Do you know what is meant by the Intended outside diameter (in the inner body parameters)?
Are these the mean values of the od and id tolerances?
RE: Press fit bushing, How do I calculate bushing ID after press fit
Follow this link it takes you to the formula that the calculator is based on and if you scroll down to near the bottom it explains the obid and ibod which your looking for.
I have never personally used this calculator.
http://ww
RE: Press fit bushing, How do I calculate bushing ID after press fit
I have been in contact with A. Slocum who did the calcs on the engineersedge website desertfox directed me to.
This web site has a lot of excel calcs you can down load.
http
The press fit calc is called "joint_press_fit.xls"
I am currently using the Areabefore = Areaafter (sugested by "Thetick") therory to determin the ID after press fit.
Thankyou for your help.
Kurt