No, I get it...but without a spindle power curve, you're still guessing. Spindle motors frequently have dramatic "steps" in their torque curve and you could be drastically influencing available power with a small speed increment. (spindle torque/power curves are often shown in a logarithmic scale so they don't look so bad)
Something is seriously wrong with the spindle power (of 3.75 hp) versus the indicated load at such a small cut...for volume work, you should be concerned. Perhaps it is something as simple as a load meter calibration...maybe not. Either way, I think it is worth looking into a bit deeper.
Best of luck. |