I have a 16" x 20" benchtop CNC, circa 2005. I have installed a Dewalt DWP611 router. The design and gantry cannot support anything heavier and max 40 IPM (a single nema 27 drives both x axis lead screws by belt). The mill was originally meant for light metal work. I use a Shopbot at local maker place, but this machine does the real light lifting.

My question is how to get a curve or rule of thumb for the horsepower at the lowest (16,000) rpm. It is spec'd for 1.25 hp at 27,000 rpm. I use GWizard for speed / feed, but for it to be accurate it needs a horsepower factor. A response from Dewalt has escaped me so far, either I get a regurgitation of the brochure or told it isn't available. I understand these are low cost disposable homeowner tools. Actual engineering data is probably not available to the support people.

I've seen it said to just cut the peak hp in half for the lowest rpm. Easy, but crude and no idea if it is actually right.

Any ideas on getting real data or best way to wing it without losing tooling.

Steve.

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