[modeleng] Re: Nylon material as a bearing surface

UHDPE is almost unbelievably slippery if you get its swarf around the
place.... we used to ice-skate on it when I worked for a metal-detector
company that made its big industrial coils out of 6 foot sheets of the
stuff.... That said there are loads of good bearing grade plastics these
days, try for oil or moly-loaded ones.... One3 of the best is a sort of
light green and feels disturbingly like a bar of rather greasy soap to
the touch.....
chrisc

-----Original Message-----
From: modeleng-bounce@xxxxxxxxxxxxx
[mailto:modeleng-bounce@xxxxxxxxxxxxx] On Behalf Of Ken Strauss
Sent: 23 November 2006 04:22
To: modeleng@xxxxxxxxxxxxx
Subject: [modeleng] Re: Nylon material as a bearing surface

Perhaps it is different in the UK but in NA cutting boards are typically
HDPE (High Density Poly-Ethylene) and not Nylon. HDPE provides lower
friction and better abrasion resistance than Nylon but it is not as hard
nor
as strong.

> -----Original Message-----
> From: modeleng-bounce@xxxxxxxxxxxxx
[mailto:modeleng-bounce@xxxxxxxxxxxxx]
> On Behalf Of The Sheppard Residence
> Sent: Wednesday, November 22, 2006 6:54 PM
> To: modeleng@xxxxxxxxxxxxx
> Subject: [modeleng] Nylon material as a bearing surface
> 
> I started work tonight on the driving truck for "Topsy" a petrol
> electric.  The driving truck is slightly different to the norm in that
> it has a single bogie and pivots on the back of the locomotive.  Topsy
> is an 0-4-2 so there is little risk of the (human) driver taking
weight
> of the (loco) driving wheels through a moment across the coupling.
> 
> Anyway, the bogie has two roller bearing that act as the rolling
surface
> when turning.  I have welded some steel in as the bearer they act
> against, but I could really do with the body being about 1/2" higher
(to
> clear the flanges on very tight corners.
> 
> What I plan to do is add some nylon to act as the bearing surface as
it
> will give me the additional height and also require little (if any)
> lubrication.
> 
> What I am interested in is the source of this nylon.  Can you see any
> reason why I can't get a cheap nylon cutting board and use that?  Is
it
> any less dense than the nylon you would get from the usual sources.
If
> it was less dense, would it really matter?
> 
> Cheers
> 
> Peter
> 
> 
> 
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