All,
I've spent countless hours finding as much information as I can, and being amazed at how little agreement there is, even across manufacturers. I see SFPM numbers from 200 to 600, chiploads from 0.001 to 0.006. I know my machine (a BP clone) is quite happy roughing with a 2-flute HSS endmill at 3200 RPM and 10-12 IPM with a 0.5" DOC and mist coolant. This gives me a good finish, long tool life, etc. But, calculations show I might potentially be able to run considerably faster than that (well, assuming enough spindle power). Would I be better off going to 1" DOC and 5 IPM? Or maybe 0.25" DOC and 25 IPM? Or faster? I haven't done a huge amount of experimentation (though I plan to over the next few days, so I expect to "sacrifice" a few tools to the Gods of CNC....).
I'm just curious what other people use. I understand there will be variation machine-to-machine, but I think it would be interesting to see what the spead is. So, suppose you want to rough out a 1" deep pocket in 6061, using 1/2" HSS tooling. What tool would you use (2-flute? 4-flute rougher?), at what RPM and what feed? Assume coolant.
Now, how about same question, but using a 1/4" tool instead? And 3/4" tool.
This should be interesting....
Regards,
Ray L.