Subject:
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Re: Super Car 8880
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 18 Jan 1999 15:20:21 GMT
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Viewed:
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1081 times
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lego-robotics@crynwr.com (Ian Sinclair) writes:
> I have been looking at the transmission for the super car kit 8880,
> mostly page http://www.kl.net/scans/8000/8880/8880-011.jpg
> Can someone offer an explanation of how this works?
This gearbox is also used in other kits like the technics Space Shuttle (1300+
technic parts). The gearbox lets you use one motor to gain four different
outputs.
Looking at the picture you see four dark grey gear wheels. These are not fixed
to the shafts. Thus the dark grey gear wheels standard position is "free wheel"
mode. Meanwhile the motor runs both shafts through a centered gear wheel.
Between each pair of dark grey gear wheels there is one light grey "plug" that
is fixed to the shaft and can turn with it. With the gear lever you push the
"plug" into one of the dark grey gear wheels - which then is fixed and starts
to turn.
By moving the gear lever you "plug" and "unplug" each of the four dark grey
gear wheels. Only one output will be working at any time. A neutral gear lever
position is also available (zero output). With two gear levers you could
operate 1+1 dark gear wheel - but only one of each pair.
The four outputs can be used in many different ways. On the Space Shuttle they
operate a)doors b)fibre optic lights c)crane up/down d)crane right/left.
It's quite neat - and it works!
However, because of the force needed to engage and disengage the "plugs", I
have found it difficult to implement this gear box as an automated feature
using a Lego motor without accepting some "slip" in the gear. But maybe someone
else has the answer to this?
Franz-Michael S. Mellbin
> --
> Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message is in Reply To:
 | | Super Car 8880
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| I have been looking at the transmission for the super car kit 8880, mostly page (URL) others. With the four position shifter, these two special parts and other normal gears they get four speeds? Or is it three and reverse? Can someone offer an (...) (26 years ago, 18-Jan-99, to lugnet.robotics)
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