11 Apr
2013
11 Apr
'13
10:49 p.m.
On Thu, Apr 11, 2013 at 4:20 PM, Tony Duell <ard at p850ug1.demon.co.uk> wrote:
Mention of the Alps plotter reminds me that we've had various discussions
about all the plotter mechs with broken gears but we've never worked out
the details on fabricating replacement gears. I've learned a lot about
fabrication over the past couple of years, so I wanted to take another stab
at the discussion to fill in the parts I don't (yet) understand...
So I was looking at this gear generator...
http://woodgears.ca/gear_cutting/template.html
... thinking that you can't fabricate a good replacement until you
have the data on what you are replacing. I'd like to try to make
either a flat (DXF) design file or a 3D (STL) design file of a
gear replacement candidate. It's possible that with so few
leaves (teeth) and such a small size (1/8" / 3mm across the
face, 1/20" / 1.27mm shaft) that there will be fiddling for
undercut, etc., but I wanted to at least make *something*
that could be tried for good fit.
So that web-based tool can make a bitmap image of a
gear given the right data, but my own 2D CAD skills aren't
honed enough to draft up a DXF of a gear. Is there anyone
on the list here who is good with 2D CAD and has time
to make an image of a gear? I'm fine with turning that into
3D and seeing how things would all turn out. I still have
several broken plotters and would like to get them working
again.
Cheers,
-ethan
One of those
4-colour pritner/ploters using the Alps mechanism. Everybody
>and his dog sold them at some poitn -- Tandy CGP115, Commodore 1520,
>there was an Atari oen, a Sharp one, theOric printer, etc.
But that little Alps unit is somewhat odd, and IMHO deserves a place i na
colleciton of hard copy peripherals.