[modeleng] Re: Gear wear
- From: Allen Messer <al_messer@xxxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Wed, 11 Aug 2004 12:54:30 -0700 (PDT)
Alan, I haven't the foggiest idea as to why it
happens, but I have seen it also happen on a Black and
Decker Portable Saw----softer gear looks perfect and
the hardened one is worn to a nub.
Al Messer
--- alanjstepney <alan@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
wrote:
> 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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