[modeleng] Re: Gear wear
- From: Allen Messer <al_messer@xxxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Wed, 11 Aug 2004 13:01:22 -0700 (PDT)
Jeff, yer right on target about the "planned
obsolesence" of mass production. Sigh! Oh for the
good old days when things were made to last!
Wilfried? I haven't heard from him in a couple of
months. I think he has taken to sailing quite a bit.
Re: Lacquer Thinner: It'll open up yer stopped up
Sinuses as well!
Al Messer
--- Jeff Dayman <jeffdayman@xxxxxxxxxxxx> wrote:
> Many of the nylons used for gear service are glass
> filled. As soon as the
> resin skin wears through, rapid mating gear wear
> occurs due to glass fibre
> ends rubbing on the mating part. Also, certain
> nylons / polyamides have
> naturally forming crystals in the resin which will
> also wear mating items.
> Nylon can flex away from the mating part, much more
> so than the mating part,
> if it is steel. So, by nature it will not wear as
> fast as a mating steel
> part. Any dirt or filings near the system will also
> become embedded in the
> nylon which makes it an excellent lap. Lubrication
> will actually worsen
> this, as it traps dirt and spreads it around.
>
> B&D of course do not want their appliances to last
> forever - if you get five
> years out of a hedge trimmer these days you are
> doing well. Then you buy a
> new one and make B&D happy. Luckily their stuff
> doesn't cost an arm and a
> leg.
>
> OT - anyone heard from Wilfried Vermeiren these
> days?
>
> Cheers, Jeff Dayman Waterloo Ontario Canada
>
>
> ----- Original Message -----
> From: "alanjstepney"
> <alan@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
> To: <modeleng@xxxxxxxxxxxxx>
> Sent: Wednesday, August 11, 2004 8:22 AM
> 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.
> >
> >
> > MODEL ENGINEERING DISCUSSION LIST.
> >
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> >
>
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