Metal removal rate and spindle load


I wanted to get some feed back on the relationship between metal removal rate and spindle load.  With the three variables in MRR being feedrate, depth of cut, and stepover can you say that the spindle load will be the same no matter how you change the variables to keep the same MRR. I was wondering if you could put a value on the variable would feedrate consume the least amount of load, then depth of cut, then stepover.  If so then feedrate would be the most efficient way to remove stock material.  Any comments would be greatly appreciated.  Thanks.

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Unfortunately, things are not nearly so simple.  The reason is that both feedrate and spindle rpm are affected by both cut width (stepover) and cut depth.  The more of either you have, the more we have to slow down the feedrate.  This is particularly profound when using an HSM toolpath where the effects are multiplied.

The only tool of its kind that I’m aware of for optimizing these variables to get the maximum MRR is our own CADCAM Wizards, built into the G-Wizard Feeds and Speeds Calculator.

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