Re: where could i find a mechanical revoultion counter i have looked every whe

Hello

I'm not exactly sure what you mean by "mechanical revolution counter," but
there are several types of devices that mechanically count revolutions. 
The simplist of these would be a mechanical tachometer, but today these are
relatively expensive and hard to come by.  Speedometers operate on the same
principle as tachometers, so you may be able to use a speedometer as a
"mechanical revolution" counter.  For these parts you may try an auto
salvage yard or auto parts suppler.

There are also several inexpensive mechanical counters that could be set up
to measure number of revolutions using a simple linkage as shown:



                       **	Linkage
                    *     +++++++++++++++++++++*
                   *         *                 *
                                               *
                   *         *		    +++*+++
                    *       *               +  *  +
                       * *                  +++++++
		Shaft				Counter

As the shaft rotates, The linkage moves the counting lever on the counter
and causes the counter to advance. As the shaft rotates further, the
counting lever resets and starts the cycle over.  You will have to
experiment to get the linkage the correct length and located in the correct
spot on the shaft.  

These types of counters are inexpensive and can be obtained from American
Science and Surlpus or Herbach's on the web.

Good Luck