Example. You have a bearing with a .5 OD. You are going to design a hole to fit the bearing. What is the norm for a press fit, Not loose but not distorting bearing upon installation. Lets say the metal is Aluminum you are makeing the pocket in.
2006-08-30 12:52:32 · 4 answers · asked by mark30504 1 in Science & Mathematics ➔ Engineering
Hello All
thanks for the information. In this case the bearing is a roller bearing and can not be resized after fit. Its O.D. is .5
Should the hole engineering to fit it be on size or slighly below to keep it from spinning ? If so what would be the amount to keep from compressing the bearing to the point that is effects the interinal I.D. The shaft going though the middle is percisioin and hardend, on size exactly.
2006-08-31 05:11:00 · update #1
There is no "standard" dimension.
The interference allowed is a function of the diameter and the type of application. For your situation it can vary from .0001" to .0005" on the diameter.
BTW, when you press a bushing into a hole, standard practice is to ream it to the correct final size after installation, since it ALWAYS gets squeezed down to a smaller size.
2006-08-30 13:07:30 · answer #1 · answered by Steve 7 · 0⤊ 0⤋
Press Fit Dimensions
2016-10-15 06:23:53 · answer #2 · answered by wearing 4 · 0⤊ 0⤋
I'm assuming you have a sintered bronze bushing as opposed to a ball bearing.
If you look at the dimensions for bronze bushings, they are usually a couple thousandths of an inch oversize (both the OD and the ID). For instance a 1/2" nominal OD bushing will probably have a diameter of 0.502". The ID will also be a few thousandths oversize. For instance, a 3/8" ID bushing will probably be 0.377 - 0.378" in diamter. The bushings are made to squeeze down a little and you can alter their fit by how large you ream the hole.
If you want just a light press fit without squeezing the bushing, you could call out a 0.501" reamed hole. When I call out holes for bushings, I usually just put 0.500 dia thru, pf for bush (press fit for bushing). The machinists know what they have to do to get the press fit, they have gobs of experience.
By-the-way, it is not a good idea to ream a sintered bronze bushing after it has been installed because it can close off the pores that allow oil to wick to the surface. But that doesn't mean it isn't done in practice; just a caution.
2006-08-30 14:36:00 · answer #3 · answered by Anonymous · 0⤊ 0⤋
This Site Might Help You.
RE:
What is the standard press fit dimention?
Example. You have a bearing with a .5 OD. You are going to design a hole to fit the bearing. What is the norm for a press fit, Not loose but not distorting bearing upon installation. Lets say the metal is Aluminum you are makeing the pocket in.
2015-08-18 23:44:09 · answer #4 · answered by Milton 1 · 0⤊ 0⤋
I'd look it up in the Machinery Handbook. It has lots of using dimensions for press fits.
Mark's handbook of Mechanical Engineering has formula's for calculating the stress of a press fit, and the force required to press the parts together.
2006-08-30 15:17:09 · answer #5 · answered by Roadkill 6 · 0⤊ 0⤋