1520 plotter (was RE: Your VIC-20 is worth $300!!! W_at_W!)

From: jpero_at_sympatico.ca <(jpero_at_sympatico.ca)>
Date: Wed Jan 30 13:05:49 2002

> Date: Tue, 29 Jan 2002 22:20:17 -0800 (PST)
> From: Ethan Dicks <erd_6502_at_yahoo.com>
> Subject: Re: 1520 plotter (was RE: Your VIC-20 is worth $300!!! W_at_W!)
> To: classiccmp_at_classiccmp.org
> Reply-to: classiccmp_at_classiccmp.org

> > 2) Use tranditional gear cutting techniques (dividing head and involute
> > cutter) to make a replacvement from scratch.
> I would try that if I had access to the equipment

That's fine and tedious job but you do get results. In old days
nearly 120 years ago was done by hand for nearly 500 years on
everything before mass production was developed. Tools were
hand-made too! With good co-od hand, can make nearly anything.
That's how I made few small parts by hand machining, cordless drill,
few jeweller's files, small bent-nose pliers. I keep fitting the
part in progress to the machine till completed. On wear surfaces, I
buff smooth with brass wirebrush on dremel.

But if you can find right size and right # of teeth pinion rod, buy
it and slice a section and drill hole to size.

Oh yeah, can make odd sized drill bits out of right size dia rods
even my old jeweller's screwdrivers.
> > 3) Make a lantern pinion of the appropriate size. This actually looks
> > very possible. The meshing gear's teeth won't be the right shape for the
> > trundles of a lantern pinion, but that may not matter.
> I don't recognize the term "lantern pinion" - is there an American
> term for that?

Not of what I know of but this term applies, think of squirrel cage
made of two discs w/ 7 holes, one for center, six for pins as
"teeth". Was popular in clocks including cockoo clocks, classic
wind up bed alarm clocks, and old timex bed clocks, late timex ones
used junky pot die-cast metal to bind all the pins, axle and gear
wheel together - cheap, cheap, cheesy cheap but effective. They
hardly wear because the pins are usually loose and allowed to roll
when gearing.

> > 4) Kludge it. One suggestion is to make a groove in the teeth away from
> > the meshing part and to bind it with fine wire. I've heard this can work,
> > but I've not tried it.

Make a impression in hard clay and pour 24 hour epoxy or potting
plastic in it. Drill CAREFULLY on the exact center when hardened.

Regular epoxies doesn't bond to plastic at all that small, about good
epoxy's job is with wood. They pop off on plastic and metal. You
have to use commerical type epoxies made for chip-making types. That
what they does work.

> -ethan


Received on Wed Jan 30 2002 - 13:05:49 GMT

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