What are your actual results and how are you obtaining the information?
We have a brand new Tyler RO-Tap RX-94 115V 60z and it is running at 281 RPM with 150 taps per minute.
I found that a simple solution is to mount two thumb operated hand counters in position so that the hammer / sieve frame will activate the thumb button. Use a calibrated stop watch and run the sieve stack for 60 seconds. Then simply check the number displayed on the counter.
