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In lugnet.technic, Paul Krieg wrote:
> In lugnet.announce.moc, Kevin L. Clague wrote:
> > After reasonable feedback about the complexity of my first reversible pneumatic
> > engine, I realized there was a very simple mechanical solution that would give
> > reversability *and* variable speed.
> >
> > http://www.brickshelf.com/gallery/kclague/Computing/p6010044.jpg
> >
> > http://www.brickshelf.com/gallery/kclague/Computing/p6010045.jpg
>
>
>
> Hi Kevin,
> Wow!!! You have quite a talent! Now, why is it that I have to read all
> your postings 3 or 4 times? If I understand right, you are able to
> continually adjust the timing in each direction up to 45 degrees? Other
> valve gears that are variable do so by limiting the movement of the valve
> and keep the timing the same. Of course there is a throttle too. That
> would be mighty tough, I think, with a Lego valve. Your solution is a
> clever alternative. Will there be more info on exactly how it is built? I
> think I can grasp most of it but the reverse mechanism is a little unclear
> to me. As a pneumatic engine enthusiast I really appreciate this kind of
> work. Thanks for posting it.
Hi Paul,
Sorry about the posts not making sense.
The differential lets me make continuous timing adjustment through 360 degrees.
The two pistons are offset by 90 degrees, as are the switches. The differential
lets you set the angle between the pistons and the switches. If one of the
pistons is at 12:00 noon, then to make the engine go forward, you adjust that
piston's switch to be at 1:30. To make the engine go backwards, set the
piston's angle at 10:30. By setting the piston's switch at 12:00 when the
piston is at 12:00 noon, the engine cannot run.
I'll crank up some building instructions in the next few days.
>
> Best regards,
> Paul
Cheers,
Kevin
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