[modeleng] Re: Gear wear
- From: "Clif Walker" <clif.gwr@xxxxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Wed, 11 Aug 2004 17:55:57 +0100
Hi All,
Standard rule is that the harder material always wears for some reason.Hence
with whitemetal bearings the shafts wear.
Vauxhall cars seem to use this rule as on their engines the camshafts run in
Aluminium bearings formed directly in the alloy cylinder head.
Regards
Clif
----- Original Message -----
From: "alanjstepney" <alan@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Wednesday, August 11, 2004 1:22 PM
Subject: [modeleng] Gear wear
> As I am sure many of you have discovered, once friends and neighbours
learn
> that you know which end of a screwdriver to hold, along comes a steady
> stream of "could you just look at this" type jobs.
> Yesterday I had a hedge trimmer passed to me, as, "it only made a noise
and
> didnt cut".
>
> It is a Black & Decker, with their usual arrangement of a spiral gear
formed
> into the armature shaft, running on to a larger nylon gear wheel.
>
> The gear on the armature is worn down almost to the root of the teeth.
> The nylon gear appears unworn.
>
> I checked, and the shaft is VERY hard, and yet has worn far mroe than the
> nylon.
> I have seen this happen before.
>
> Logically the nylon, being softer, would wear faster, but the reverse is
the
> case.
>
> Any explanations anyone?
>
> alan@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>
> www.alanstepney.info
> Model Engineering, Steam Engine, and Railway technical pages.
>
>
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