So I'm trying to figure out optimally how to rough 6061 for parts, I get large quantities of 1" cutoffs and typically have to mill them way down to make parts, so I could use a good strategy to blow big chunks of those plates down to half or 3/8 of an inch thick in a reasonable amount of time. so for right now: -my rpm is locked in at around 1600, I think increasing it to the top speed for the machine (bridgeport, I "think" its the 1hp one) will reduce torque too much, it seems to not work as well either way. I'm using always-on air to cool right now but am open to coolant. -I've tried 1/2" corncob 3 flute roughers, they dont seem to do the job, and end up melting down,seizing up, they are almost immediately covered in a coating of silver, I'm assuming the heat generated by cutting without coolant is enough to melt the tiny roughing chips but not the big "normal endmill" chips -I've tried a 1" 2 flute indexible endmill, while I am only going about .1 per pass in my testing, they are huge wide passes and the thing just glides through the metal with a low hiss and not a typical milling noise as long as it isn't hitting an edge, so I think I'm on the right path, it doesn't center cut and with a mill that size ramps have to be huge, I'm open to just buying a better big indexable if it'll do the job. -With a 1/2" HSS endmill I can get around 18ipm at .2 depth, any faster and the cutting gets noisy so I think thats about "right" I've spotted some 3 flute 7/8" roughers for reasonably cheap I think I may try as well. It seems to me that the most important thing at my RPM is to make big chips and have a lot of clearance for them (the smaller roughers just make powder and seem to rub/melt down. In my research a vast majority of the advice is either routers or really powerful machines. Can anyone suggest a roughing strategy for a low-ish RPM machine like this?