Subject:
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Re: Pneumatic Transmission
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Newsgroups:
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lugnet.build
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Date:
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Thu, 5 Aug 1999 21:13:00 GMT
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Viewed:
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1354 times
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In lugnet.build, Greg Majewski writes:
> I now know that it is possible to make one of these, but does anybody have any
> ideas on how to make a pneumatically powered transmission have more than two
> speeds? I have just built one, but I failed horribly. It has two gears, but
I've thought about it (as an automatic, with speed-induced pressure
determining the gear), but never tried actually building it.
To avoid gear meshing trouble, it might be worth trying a setup
where the gear-selecting part is moved perpendicular to the
driveshaft axis, rather than on it.
> only one speed because of a screw up with gear ratios. This also brings up
> another question: Has anyone made a decent transmission out of non-auto
> chassis/super car parts?
Lots. IIRC, the best I've done is a 5+R, and I believe I've made
a plain 6-speed, too. Though it would be more elegant, I think,
to have reverse selected automatically by the drive wheel direction,
i.e. when backing up, go through reversing reverse-level (between 1 and 2)
gearing; when going forward, go straight through the manual transmission
- and the motor always goes the same way.
The easiest way is basically shown in 8865: an input axle and an output
axle, both with multiple gears, and a shift axle that connects them via
different combinations (such that both input-shift and shift-output
ratios change), some using only one gear on the shift axle, some using 2.
The difficult parts I find to be 1. having the ratios in order 2. having
top and bottom ratios close enough together (though one might want both
fast engine-demo gears as well as slow-engine-turning easy rolling
gears in a Lego car, anyway).
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Message is in Reply To:
 | | Pneumatic Transmission
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| I now know that it is possible to make one of these, but does anybody have any ideas on how to make a pneumatically powered transmission have more than two speeds? I have just built one, but I failed horribly. It has two gears, but only one speed (...) (25 years ago, 5-Aug-99, to lugnet.build)
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