Request for advice regarding minimum bushing clearance & material
Request for advice regarding minimum bushing clearance & material
(OP)
Hi everyone,
I would like to ask if anyone could please offer some advice on the following...
I have a cantilever mounted round steel housing about 1.5" long that I want to oscillate on a 3/8" OD hardened steel dowel pin. I plan on just pressing a bushing material into the full length of the housing, and then drill & ream the bushing ID to fit over the dowel pin. I need the clearance between the ID of the bushing and the OD of the dowel pin to be as small as possible. I can only lube the bushing once at
assembly and then never again.
I would prefer that the maximum clearance between the dowel pin OD and the bushing ID is not over .001" but I may be able to get away with .002". I would like to use a high pressure grease to lube the bushing and shaft, but how small can my clearance be before it won't allow the grease to go and/or stay between the shaft OD and the bushing ID, or
before the low clearance defeats the lube somehow ?
The housing is just oscillated by hand intermittently. Any
recommendations for a bushing material, bushing ID surface finish, and lube, would be appreciated.
Presently, I have no choice but to press some bushing material into an existing housing, but in the future, would I be better off making the housing itself out of some pre-hardened 4140 and then using the housing itself as the bushing material ? Would this wear much better than a bronze bushing ? Would non-hardened 4140 or non-hardened tool
steel wear better than bronze ?
I would like this thing to last as long as possible before the clearance opens up too far. I also think I need to stay with a bushing and not a rolling element bearing.
Any advice or personal experience with bushing materials, loads, and estimated wear rates would be appreciated.
Thanks
John
I would like to ask if anyone could please offer some advice on the following...
I have a cantilever mounted round steel housing about 1.5" long that I want to oscillate on a 3/8" OD hardened steel dowel pin. I plan on just pressing a bushing material into the full length of the housing, and then drill & ream the bushing ID to fit over the dowel pin. I need the clearance between the ID of the bushing and the OD of the dowel pin to be as small as possible. I can only lube the bushing once at
assembly and then never again.
I would prefer that the maximum clearance between the dowel pin OD and the bushing ID is not over .001" but I may be able to get away with .002". I would like to use a high pressure grease to lube the bushing and shaft, but how small can my clearance be before it won't allow the grease to go and/or stay between the shaft OD and the bushing ID, or
before the low clearance defeats the lube somehow ?
The housing is just oscillated by hand intermittently. Any
recommendations for a bushing material, bushing ID surface finish, and lube, would be appreciated.
Presently, I have no choice but to press some bushing material into an existing housing, but in the future, would I be better off making the housing itself out of some pre-hardened 4140 and then using the housing itself as the bushing material ? Would this wear much better than a bronze bushing ? Would non-hardened 4140 or non-hardened tool
steel wear better than bronze ?
I would like this thing to last as long as possible before the clearance opens up too far. I also think I need to stay with a bushing and not a rolling element bearing.
Any advice or personal experience with bushing materials, loads, and estimated wear rates would be appreciated.
Thanks
John





RE: Request for advice regarding minimum bushing clearance & material
http://www.neelyindustries.com/pdf/77.pdf
Here is one alternate (C-Flex) to facilitate Oscillating motion you might want to explore.
http://www.c-flex.com/companyproducts.pdf
Here are two approaches to the type bushing you are attempting to make. These are standard off the shelf items.
They are easily replaceable.
http://w
http://www.connexusa.com/HTML/principle.html
RE: Request for advice regarding minimum bushing clearance & material
I will check out the links you gave.
John
RE: Request for advice regarding minimum bushing clearance & material
http://www.ggbearings.com/
Ted
RE: Request for advice regarding minimum bushing clearance & material
http://www.afmusa.com/bushings.composite.asp
The DX versions are lead free and the DU bushings have a small percentage of lead which helps if you're running them dry. These bushing can be sized (peened) after installation to achieve the correct dimension.
Heckler
Sr. Mechanical Engineer
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RE: Request for advice regarding minimum bushing clearance & material
RE: Request for advice regarding minimum bushing clearance & material
RE: Request for advice regarding minimum bushing clearance & material
I have used these quite a bit and they have perfomed well.
RE: Request for advice regarding minimum bushing clearance & material