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

--- Adrian Graham <Adrian.Graham(a)corporatemicrosystems.com> wrote: "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). -ethan __________________________________________________ Do You Yahoo!? Great stuff seeking new owners in Yahoo! Auctions! http://auctions.yahoo.com