Shopsmith Forums

reible wrote: Mon Jul 05, 2021 2:20 pm When you have more then one port open then one of them is under test which should affect that port more then the others? Testing imposes restrictions to that port only, right?

Ed

Yes but I am uncertain as to how the ports will react to the various configurations.

Based on my understanding right now, I expect my test RPM will be 6700RPM in all three ports at all times, in all configurations.

Why? Because Jim says the CFM in all ports will be the same (200CFM). I am equating this to my test with only one port open and under test (6700RPM)

Thus the assumption that 6700 rpm (with my test apparatus) equates to 200CFM. in real life.

I am no longer without instrumentation. It would not make it through a calibration lab but it will do what I need ( that is excited by Dust Collector air flow) and provide a relative indication of the different hose configurations. Understand that a tachometer is needed to take the rpm readings off the fan blade.