Subject:
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Rotation sensor gearing.
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 21 Sep 2000 16:12:08 GMT
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Original-From:
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Steve Baker <sjbaker1@airmail./AntiSpam/net>
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Reply-To:
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sjbaker1@AVOIDSPAMairmail.net
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Viewed:
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600 times
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Great! Now the information is coming together.
Denis Cousineau's Lego motors web page says that the
'new' Technics motor runs at 60rpm - and the Dacta site
says that the rotation sensor is good to 500rpm.
So gearing the motor up by a factor of (say) 5 would
spin the rotation sensor at ~300rpm - giving plenty
of room for variation from motor to motor.
A 40t gear on the motor and an 8t on the rotation
sensor should be *perfect* - at 16 counts per rotation,
we'll get 80 counts per motor rotation - or 4.5 degrees
accuracy at the motor shaft - irrespective of motor
speed (give or take for gear slop).
This arrangement is pretty neat actually - the rotation
sensor fits right next to the motor and the two
shafts are exactly the right distance apart for that
gearing. You'd almost think it was designed that
way! :-)
I'll play with it some this evening.
--
Steve Baker HomeEmail: <sjbaker1@airmail.net>
WorkEmail: <sjbaker@link.com>
HomePage : http://web2.airmail.net/sjbaker1
Projects : http://plib.sourceforge.net
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http://prettypoly.sourceforge.net
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Message has 1 Reply:
 | | Re: Rotation sensor gearing.
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| Hi ! (...) I think that common sense might lead you to suspect a number like 60 rpm. That's one rev per second. You could watch it go round! The one I measured ran at ~380 rpm from the RCX and ~420 rpm from the 9 v battery pack with no load. JB (24 years ago, 21-Sep-00, to lugnet.robotics)
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