Subject:
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Re: Lego Calipers
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 1 Sep 1999 18:24:16 GMT
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Viewed:
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1031 times
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In lugnet.robotics, lego-robotics@crynwr.com (Ben Williamson) writes:
> [...] I used the 20t gear in my (very simple) calipers
> which are now on the web:
(actual URL is http://www.pobox.com/~benw/lego/calipers/index.html )
> Those 4-stud-long gear rack thingies have 10 teeth each, and I wanted to
> get close to one increment on the rotation sensor per stud of movement.
> With the 20t gear it works out at an increment per half stud, which is
> fine. Now I can go around my house and measure everything in real units -
> Lego studs. :)
Those calipers are pretty cool. It seems to me though you could get more
precision, since the slop on the gears is a lot less than half a stud. The
rotation sensor presents very little friction torque, so I imagine you could
add a 5-to-1 expansion stage (with a z40 and a z8) and it would still work
fine. Then you would have a reading in 1/10 stud increments, a lot more
convenient than 1/2 stud increments because you don't have to divide by two --
just shift the decimal point over.
- Robert Munafo http://www.mrob.com/
LEGO: TC+++(8480) SW++ #+ S-- LS++ Hsp M+ A@ LM++ YB64m IC13
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Message is in Reply To:
 | | Lego Calipers
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| (...) Quite useful too - I used the 20t gear in my (very simple) calipers which are now on the web: (URL) Those 4-stud-long gear rack thingies have 10 teeth each, and I wanted to get close to one increment on the rotation sensor per stud of (...) (25 years ago, 1-Sep-99, to lugnet.robotics)
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