🚀 go-pugleaf

In article <1992Nov9.092931.42@kirk.msoe.edu>, welch@kirk.msoe.edu writes:

|> I'm trying to put together some inverted pendulum modules
|> for demonstration/lab purposes for fuzzy logic.  So far we
|> are leaning towards a ball-screw type linear drive for the
|> platform with a low friction pot for the pendulum pivot.

I don't know of anyone who sells these, even as kits, but here are
some ideas:

1. Instead of the ball-screw drive, why not use an aircraft steel
   cable string between two pulleys/bobbins.  This is the kind of
   approach I've seen in most pen plotters for moving the pen, and in
   a few printers for moving the printhead.  It seems to work well,
   without much stretch.

2. Another possibility - a Gilmor (spelling?) belt between pulleys.
   I've seen these in a lot of lower-priced printers.  These are the
   toothed flexible belts, where the pulleys may or may not have
   teeth that mesh with the belt.

3. Instead of the pot for the pivot, you consider one of HP's cheap
   optical encoder pot replacements.  They are probably rather more
   expensive than a pot (I think about $20), and need a decoder chip,
   but are quite precise and have really good repeatability.  We used
   these in one of our projects with good success.
-- 
Erik Horstkotte, Togai InfraLogic, Inc.
The World's Source for Fuzzy Logic Solutions (The company, not me!)
erik@til.com, gordius!til!erik - (714) 975-8522
info@til.com for info, fuzzy-server@til.com for fuzzy mail-server