Pressure Air Motor Replacement
By John Grant
Carl Shannon wrote:
> Hi friends,
>
> I received two calls tonight, which I want to pass on to the list. The
> first call was inquiring about the where-abouts of a part for an
> Aeolian Grand player reed organ. Seems that after he bought one from
> me, he got the fever, and purchased another one. Because I know that
> mine was complete, he apparently did not do his homework when he bought
> the second one... and now needs a rather vital part. He needs an **air
> motor**. The instrument is a pressure instrument.
<Snip>
Carl, faced with a similar problem one time I solved it thusly: Take a spare standard player piano air motor (surely you have some, but if not, let me know and I will contribute one to the cause) and build an air-tight wooden box to contain it. Make a felt bushed hole in the appropriate place for the crank shaft to exit. Depending on the exact dimensions, you may have to fit the shaft with a coupler and extension to get outside the box. Put two other appropriate sized holes at convenient places on the box. One will be the pressure input which simply connects to the inside volume of the box. The other hole should have a flanged nipple on the INSIDE of the box with a piece of hose going to the normal vacuum input of the air motor. Leave this hole open to atmosphere on the outside of the box. To the air motor the pressure differential looks the same and it will run just fine. Also, if it runs in the wrong direction, most motors with a standard crankshaft design can be made to run in the opposite direction simply by reversing the crankshaft 180 degrees in it's journals. This WON'T work, however, in designs where the pneumatics' linkages and the slide valves' linkages run on separate lobes of the crankshaft. Good luck. -John Grant
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E-mail: ir004161@interramp.com (John Grant)
Date: 06/22/96
Time: 19:22:05
"I used to be indecisive, but now I'm not so sure."
"It's never a good idea to speak of things in absolute terms."
"I don't believe in superstition; it's bad luck."
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(Message sent Sun 23 Jun 1996, 02:44:07 GMT, from time zone GMT-0700.) |
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