Hi ZEPMaine:
Be careful making too many assumptions about your process from one measure...it's a road to Hell if you're implying outcomes from only the one measure especially if it is indirect.
It's a bit like saying I'm going to grind to a given dimension by knowing the infeed rate and just timing the operation without bothering to actually measure what diameter you got..
Theoretically yeah, you could do that, but only if all the variables are accounted for and if you can time it perfectly and if the infeed rate is perfectly consistent and etc etc...you know what I mean.
SImilarly, in this situation, as Carbide Bob points out you have a bunch of potentially confounding variables that you must identify and control if the MRR is to mean anything.
I understand that in a big grinding house where the process is very well controlled and you're making the same parts over and over, you can make some useful inferences from a measure like this, but with a couple of grinders in a normal job shop where the coolant concentration and purity isn't even controlled (just as an example) you can't infer much of anything from a single measure like this.
So if you want to go there you need to develop all aspects of your grinding processes in tandem if that's not already been done, and you need to track and know the influence of everything relevant, not just the MRR.
Cheers
Marcus
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Vancouver Wire EDM -- Wire EDM Machining