bushing ID calculation after press fit

[SABARINATHAN M]

Area before = area after
A= 3.14(ro^2-ri^2) how to calculate the area. which element area to be aplied in this case?

 

[rb1957]

how much does the diameter of the hole change when you install the bush ?

Sounds like something Timoshenko would have had something to say about.

another day in paradise, or is paradise one day closer ?

 

[Tmoose]

"Sounds like something Timoshenko would have had something to say about."

Also Baron Siméon Denis Poisson, or at least the ratio named after him.

 

[rb1957]

ah yes, "Mr Fish"

another day in paradise, or is paradise one day closer ?

 

[handleman]

https://www.engineersedge.com/bearing/bushing_press_fit.htm

You didn't mention material... However you may note that (as referenced above) a sizing or reaming operation is often required after press fit to achieve the desired final dimension tolerance.

 

[rb1957]

how precise do you need to be ? Are we "counting angels" (dancing on the tip of a needle) ?

I doubt that the geometry change due to a press fit is significant, or even measurable.

The fact of the matter is the hole will slightly expand, the bush OD and ID will slightly contract.
As mentioned above, in the real world there is a post install ream to establish the bush hole diameter.


another day in paradise, or is paradise one day closer ?

 

[hydtools]

As an estimation subtract one half the diametral interference from the uninstalled bushing ID.

Ted

 

[TheTick]

Calculated ID based on assumption that cross-sectional area before and after are the same.

 

[TheTick]

You know OD before,and after, and ID before. Set area equations as equal. Assume housing OD dies not expand.

 

[rb1957]

how much interference is there in a push fit ? "1 gnat" ? "1 CH" ?

another day in paradise, or is paradise one day closer ?

 

[Tmoose]

RE: "push fit". If I am doing the pushing, I'm thinking .0002" clearance with bores and pins finished with cylindricity even better.

 

[rb1957]

exactly … how much will the ID change in a press fit bushing ? ans: not much.

another day in paradise, or is paradise one day closer ?

 

[DAVIDSTECKER]

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