[TheForge] Power hammer questions/Frosty

[theforge@mailman.qth.net]

>> Can someone tell me the approx.
>> size of groove needed? My power cyl. is 5" dia and 6 in. stroke. The slave
>> is 2.5 in. dia. and 10 in. stroke. The displacement ratio is about 2/1, I
>> believe.The gear reduced speed is about 275 strokes per min.
>
>I have no idea how much groove you need. However, in the few drawings I've
>seen nobody used grooves for balance valves/ports. Most have flat sections
>in the piston rods where you have grooves, they look like wrench flats. If
>you don't think you can make the grooves larger make them longer so they
>stay open longer, at 2:1 you have more than enough air.
>
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It seems to me that another way of tuning could be to change the speed via pulley change etc. Slowing down would allow the balance grooves/flats to be "opened" longer.

Bob Schade