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(...) My friend Doug has used them up to 30 PSI. (...) I don't know what the maximum allowable pressure is, but 30 PSI is probably a good upper bound. It depends on which direction you are trying to move the weight. If you are trying to move it (...) (21 years ago, 23-Sep-03, to lugnet.org.us.lugola, lugnet.technic)
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(...) What I'm currently thinking about is a mechanisim that will move an arm that's hinged at one end through a near 180 degree arc before it comes to a rest and then to have the reverse switch pull the arm back to it's initial position. At one end (...) (21 years ago, 25-Sep-03, to lugnet.technic)
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(...) Near 180 degrees maybe tough. You'll need to keep the piston attached as close as possible to the pivot point of the arm to get the maximum range. <snip> (...) Thanks for the positive feedback. I have three large pumps all attached to the same (...) (21 years ago, 25-Sep-03, to lugnet.technic)
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(...) Levers are your friend! Have a look at the mechanisms used to drive the buckets on 8455 backhoe (front and back), and similar models. While these operate nowhere near 180 deg, adjustment of lengths/fulcrums may well get you closer. ROSCO (21 years ago, 25-Sep-03, to lugnet.technic)
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(...) The four bar linkages used for driving excavator buckets are good for doing appoximately 180 degrees motion, especially when you have to go "round a corner". The following shows an example - I'm not sure about its angular range but certainly (...) (21 years ago, 25-Sep-03, to lugnet.technic)
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(...) For models with a lot of cylinders I use a car tyre air compressor. I bought the slightly more expensive one tha has a variable pressure limiter and set the limiter to 20 PSI initially. This wasn't quite enough. 25 PSI was good for all but the (...) (21 years ago, 26-Sep-03, to lugnet.org.us.lugola, lugnet.technic)
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(...) [snip] (...) Thanks! (...) Mark Terrabain invented a single piston, single switch AND gate, but it only has one pressure output, so you have to retract the pistons with some external force like rubber bands. I invented a single pison, dual (...) (21 years ago, 26-Sep-03, to lugnet.org.us.lugola, lugnet.technic)
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(...) Ack! Sorry for duplicating your message there Rosco, my NNTP connection to lugnet has been a bit flaky recently which confuses me greatly. I've had a message dissappear as well, is anyone else experiencing NNTP woes? Jennifer (21 years ago, 26-Sep-03, to lugnet.technic)
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(...) This post explains the recent wonkyness with Lugnet: (URL) (21 years ago, 26-Sep-03, to lugnet.technic)
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(...) Which explains why I got 34 messages after only being gone since yesterday morning... ~Mike (21 years ago, 26-Sep-03, to lugnet.technic)
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(...) No problem Jen. And you did value add with the link, I think that counts as extra information ;) ROSCO (21 years ago, 26-Sep-03, to lugnet.technic)
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(...) Don't know about 'beauty', but my dancing Easter chickens were popular at work: (URL) ran them off the compressed air coming out of the wall (in a hospital), and I had to turn the pressure way down to keep them from boucing apart... (18 years ago, 10-Jul-06, to lugnet.org.us.lugola, lugnet.technic)
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