Electric valves for reproducing pianos
By John Grant
[ Editor's Note: The following message directly references the
[ preceding message. This is possible because this is a side
[ conversation which is being shared with us. Hi Robbie,
Thanks for your observations. Quite some time ago I was cybersponding with someone whose name I cannot now recall (and I'm too lazy to try to find the message traffic). He had some background on the CC-3 and in fact sent me one of the (unassembled) valves. Very impressed by the engineering that went into it (didn't Wayne Stahnke do the basic design?) but would have guessed the cost to replicate would have been closer to $20/valve!
As far as my valve's performance goes, I really don't have very sophisticated test equipment but I do know that it will open against over 200" w.c. vacuum, perhaps as high as 300". Repetition is at least as fast as I can possibly push a button switch (maybe 10 cps?) but could be higher. I have no way of measuring this precisely, nor the decrease in repetition rate that would presumably accompany increasing applied vacuum. Richard Tonnesen did perform some basic response time tests for me but I cannot put my fingers on his report right now. [Richard, do you still have this data? Can I get another copy? Sorry for the hassle.] The solenoid slug is .150" diameter by about .850" long, not exactly "massive". Sounds similar to the one you describe.
Robbie, if you have the means to do performance tests on the valve, I will make one available to you. I'll need your mailing address as I don't think it will propagate through the 'net very well!
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Name: GENIUS
E-mail: ir004161@interramp.com (GENIUS)
Date: 12/01/95 Time: 10:50:23
"Every creative act results from a sudden cessation of stupidity."
-Edwin H. Land, inventor of the Polaroid Land Camera
"Help stamp out superfluous redundancy." -Genius
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(Message sent Sat 2 Dec 1995, 04:19:33 GMT, from time zone GMT-0800.) |
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