dougwalkabout: As Phaedrus indicated, it's all about the operator. Light, quick passes are fine so long as the blade never gets uncomfortably warm to the touch. A nearly worn out belt can get you in trouble in that regard.
Hi,
I've gotten a blade uncomfortably warm to the touch without power equipment, just a dry piece of sandpaper.
The apex of a sharp knife is only ~1 micron thick or 1/1000 millimeter, it doesn't take a lot to burn/overheat
Most factory sharpened knives come burned from the factory. They're sharpened without coolant on beltsanders and buffers.
See
global-knife.com/catra/ test on factory vs hand sharpened edges Will I feel the edge of my knife overheating from grinding with bare hands? - knivesandstuff
https://www.youtube.com/watch?v=vDiBqEDVEZY Summary: ~2inch strip of knife steel, blowtorch (thousands of degrees hot), 40 seconds later the knife feels warm
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