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Posted by Nick on March 12, 2007, 11:20 pm
Please log in for more thread options D Herring wrote:
> Roberto wrote:
>> Hello,
>>
>> I want to experiment (just for fun) with a PC controlled percussion
>> player mechanism.
>> Initially I want to play with a small solenoid valve connected to a
>> small pneumatic piston.
>> Piston will drive the hitting arm. I think max actuation/hitting rate
>> would be around 20Hz. (Is this rate reasonable?)
>
> IIRC, Hanon's piano finger exercises are often played around 108
> beats/minute, 4 quarters per beat. A Czerny exercise might go twice
> that. 120*8 keys/minute = 16 Hz. Yes, 20Hz is reasonable. On the
> percussion side, I'd guess that's near the max speed a snare drummer
> could perform.
108 beast/min < 2 Hz, twice 108 beats/min < 4Hz.
It is impossible to get 16 Hz using *ONE FINGER* (You can try :-)
BTW, 20Hz accepted as continual sound, not as sequence of beats.
>
>> (I do not have any hands on pneumatic experience. That's why I've
>> considered starting with pneumatic, so I can learn more)
>
> As ZWS noted, pneumatics are not known for speed or precision...
>
>> How to control the hitting force in pneumatic system ?
>> Can you recommend (low-cost) small/miniature solenoid valves and
>> pneumatic pistons etc for this experiment?
>
> Pneumatic force is proportional to the supply pressure. Solenoid force
> is proportional to the drive voltage. No good ideas for supply.
>
>> Any other suggestions?
>
> If you have trouble finding "the right parts", then get a single, cheap
> actuator moving first... If you have some servos modified for
> continuous rotation or similar motors handy, you might try attaching a
> spoked striking mechanism and spinning them at different speeds...
>
> - Daniel
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> small pneumatic piston.