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Posted by Bob on March 26, 2006, 3:30 pm
Christopher X. Candreva wrote:
> : Nobody makes their own ordinary gears unless they're into machine shop
work
> : for its own sake.
> Which was exactly my thought when I read the article, so I didn't
> bookmark/notate it. :-)
The proper cross section for a gear tooth is a cycloid curve, not
a circular curve. If you made it with a drill, it would be noisy, with
high friction and lots of backlash. It would be crap.
To make good gears you need a vertical mill, a rotary table and
a gear cutter. The right tools will probably cost you $500 to $700
new from Sherline or Taig. You could get them used for maybe
half that. Of course, you could use them for much more than making
gears, and if you are serious about robotics, you will probably end
up buying a mill, lathe and rotary table eventually anyway.
For small gears, you can buy extruded brass or plastic "pinion wire".
When you need a gear, just slice off a piece.
> I am looking for an alternate way to make my motorized turntable (robot
> head). I was looking for a cog-belt type pulley in the range of say 6" OD,
> something that would fit on the outside of a hardware store lazy susan
> bearing. I haven't seen anything in that size range.
Maybe a bicycle chain and sprocket?
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> pulleys. I am remebering something that showed how to print out a template,
> use a drill to make the teeth, etc.