×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Nylon bushing rpm

Nylon bushing rpm

Nylon bushing rpm

(OP)
Will A nylon bushing, 3.75"od 2"id on a 2" shaft against identical nylon bushing at 10 lbs thrusting pressure at 5000 rpm, hold up or melt, deform from friction?  If failure. Then how about changing one bushing to steel?

Please help

RE: Nylon bushing rpm

DuPont gives good guidelines regarding the dynamic interaction of various plastics and plastic/metal interfaces.

The key is to not have similar materials interacting. Acetal-to-nylon is better that mating similar materials, for example.

RE: Nylon bushing rpm

Biiltit
Sorry to be the bearer of bad tidings but unless you are planning to continuously liquid lubricate the bearing, nylon has no chance at 5000rpm. The surface will rapidly exceed the melt temp and drool away from the bearing surface. Even if it were lubricated, I would be sceptical about using nylon.
My company manufacures marine propeller shaft and pump sleeve bearings and at that speed, continuous water or oil lubrication is mandatory.

RE: Nylon bushing rpm

(OP)
I think I will attach a oil embedded bronze washer to one Nylon hub and a steel for the other.

I appreciate all of your replies.  Very helpful

RE: Nylon bushing rpm

How about using a high temperature polyamide, like a polyphthalamide?
Their glass transition is about 110C and their melting point about 350C.

RE: Nylon bushing rpm

If you want high temperature nylons why not consider Stanyl nylon 4.6 which has a HDT of 295 deg C for some grades.

As already mentioned, nylon and acetal makes a very good bearing for plastics, and teflon plus silicon oil in the acetal makes it even better still, but negates the advantage of the high temperature nylons.

Without doing the sums, I doubt that plastics are suitable for this bearing.

Regards
pat   pprimmer@acay.com.au
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources