On Tue, Jun 24, 2014 at 4:06 PM, <email@example.com> wrote: > On 2014-06-24 at 16:41:23, Ville Laustela (firstname.lastname@example.org) wrote: >> I recently bought a Commodore 1520 plotter printer from eBay. I was lucky: none of the >> gears were split > > You were lucky, indeed. I have several of those and ALL have the same failure: this tiniest gear on the axis of the stepper is broken and split. Indeed. I have a printer or two and a small box of surplus printer mechanisms (from Electronic Goldmine 11 years ago), and nearly every motor gear is split. > Kiitos! I need to find one day a source of those damned tiny gears or I print them one day myself ;-) (and as we do every few years... here's the "make new gears" thread, but hopefully with a modern twist...) With the proliferation of laser cutters and CNC machines, have we progressed to the point where "we" can feasibly make these at home? I've done a bunch of 3D printing (with filament and resin), but perhaps a machined Delrin gear or a sintered plastic gear (from Shapeways, perhaps?) is feasible? One thought is to 3D print not individual gears but a long (2" to 3" or maybe longer) and slice it into individual gears. Shapeways charges by the cubic centimeter plus a per part handling charge (the last time I looked) so if single print could be made into multiple gears, that might make it cost effective, presuming the sintered plastic was strong enough. They also do metal at a higher cost, but I'd be worried that a metal drive gear would chew up the next gear down the line. Laser-cut Delrin would also be somewhat inexpensive. It should only take a couple of minutes to cut out something that small, and a few trials should establish what mathematical dimension (scaling) is needed to accommodate the kerf of the laser. I have access to a 60W laser that rents for $35/hr, and I know of other hackerspaces that have laser that bill out at $1-$2 per "laser minute" ("on" time). -ethan Message was sent through the cbm-hackers mailing listReceived on 2014-06-24 21:00:38
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