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c s soh wrote:
> Jennifer Clark wrote:
> >
> > One type of pump I've not seen you test yet is a varation of Michael
> > Powell's using an 8 tooth gear onto 40 tooth gear reduction rather than the
> > belt drive, as this seems to improve performance significantly.
>
> I don't know how or why but I don't seem to have come across it. I guess
> I could try to build one but it'll help if you could give me a link or
> reference to it.
Sure - I made a rather ugly version of it including limit switch for my skid
steer loader model. There is a picture here; I don't actually think many
modifications other than replacing the small and large pully with 8 and 40 tooth
gears were needed. I still see this compressor section as Michaels's effort
since the modification is fairly obvious;
http://www.telepresence.strath.ac.uk/jen/lego/ls160_lrg/ls160_compressor_pic1.htm
http://www.telepresence.strath.ac.uk/jen/lego/ls160_lrg/ls160_compressor_pic2.htm
I added an extra 9V motor for the excavator model to provide increased airflow,
although I suppose that is cheating ;-) anyway, the picture is near the bottom
of the page:
http://www.telepresence.strath.ac.uk/jen/lego/excavator.htm
I also have a hand controller with built in limit switch, although it is really
the same as Ralph Hempel's design spread flat and using the full pump stroke:
http://www.telepresence.strath.ac.uk/jen/lego/ideas.htm
> Well, I can have a go at it. But really, with this pressure sensor
> thing, limit switches would soon be obsolete. For you can sense the
> pressure (using a light sensor watcher in RCX code, for example) and
> shut off the pump motor at whatever level of pressure you require. Going
> hi tech all the way, y'know!
True enough! But some of us Luddites don't even have an RCX :-)
The pressure limit switch is also a lot cheaper and more compact to include in
models than the RCX.
Jennifer Clark
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