LEGO DACTA : 151


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Subject:	Re: Pneumatic Pump Testing Goes Hi Tech
Newsgroups:	lugnet.robotics, lugnet.technic, lugnet.build, lugnet.dacta
Date:	Tue, 10 Apr 2001 14:43:13 GMT
Viewed:	3745 times

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

Message has 1 Reply:

		Re: Pneumatic Pump Testing Goes Hi Tech
(...) Thanks, Jen. I'll have a go at it. (...) Well, I was just thinking to what extent you could take the pressure sensor device. Actually, most of my own creations don't use the RCX. And they're mostly powered by the manually operated hand pump. (24 years ago, 10-Apr-01, to lugnet.robotics, lugnet.technic, lugnet.build, lugnet.dacta)

Message is in Reply To:

		Re: Pneumatic Pump Testing Goes Hi Tech
(...) 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. (...) Well, I can have a go at it. But really, with this pressure sensor thing, (...) (24 years ago, 10-Apr-01, to lugnet.robotics, lugnet.technic, lugnet.build, lugnet.dacta)

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