[modeleng] Re: Gear wear
- From: "Jeff Dayman" <jeffdayman@xxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Wed, 11 Aug 2004 17:17:45 -0400
True enough about the sinuses Al - LT should be used outside only, with lots
of ventilation.
Cheers, Jeff Dayman Waterloo Ontario Canada
----- Original Message -----
From: "Allen Messer" <al_messer@xxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Wednesday, August 11, 2004 4:01 PM
Subject: [modeleng] Re: Gear wear
> 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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