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

From: Ethan Dicks <erd_6502_at_yahoo.com>
Date: Tue Jan 29 08:15:25 2002

--- Adrian Graham <Adrian.Graham_at_corporatemicrosystems.com> wrote:
> I'm breaking a 1520 for spares since I've got a MIB one in the museum and
> this other one has tatty polys and isn't in the best condition. I'll
> check, but it'll be the 240V version.....

"tatty polys"? It sounds British, but I have no idea what it is.

I've just been trying to locate replacement gears for my 1520 - So
far, my measurements have yielded the following...

14 teeth
0.175" tall
~0.144" diameter (hard to get an exact measurement with my micrometer)

I do not know the pitch or the depth. Not sure how to accurately
measure them except with a fine-pitch measuring stick and a magnifying
device (I have neither).

I do not know the shaft diameter yet, but that's only because I haven't
gotten the micrometer to where the plotter is.

There are two of these gears in the plotter, one on the X and one on
the Y gear trains. They are the last step in the reduction. I have
an Atari plotter with the same innards as the C= 1520 and both of the
gears in there are split along the bottom of a groove - thin material
there, plus a bit of stress and who knows what kind of thermal expansion.

The local hobby stores do not carry gears with such a fine pitch. For
that diameter, they have 10 and 12 toothed gears, not 14. There are
gear specialty companies, but I don't have enough measurements to search
the catalogs or place an order.

I'd love to have a handful of these - I have a real 1520 as well as the
Atari plotter (and pens and paper).


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Received on Tue Jan 29 2002 - 08:15:25 GMT

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