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Rick
There's a couple of ways you can do this. The easy and compact way (if
you're a grinder) is to cut the teeth off one half of the circumference of
the drive gear -- works pretty well.
If you want an intermittent motion (although it's not a full half-cycle) you
can use using two 24ts (or medium/large pulleys, or 40ts, or 1x3 liftarms,
or whatever), 5 or more studs apart, with a 6L+ Technic brick pinned between
them. The brick is pinned to one of the off-center holes on each gear such
that it is parallel with the beam supporting the drive gear axles, and has a
4L rack piece clipped to its studs. The rack piece engages the driven gear
intermittently as the two drive gears move the Technic brick up-and-down.
Cheers,
JP Brown
Serious LEGO: http://jpbrown.i8.com
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Message is in Reply To:
 | | Re: Mechanical tricks
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| Try driving a gear off-center (ie put the drive axle of the motor into one of the other holes in the gear). This may not give you exactly the behaviour you want though. (...) (23 years ago, 2-Nov-01, to lugnet.technic, lugnet.robotics)
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