MAN I'm having a hard time finding consistent feeds and seeds charts for using the drill press. I can think of a million reasons each tool company and each enthusiast's group offers different values - proprietary tool materials, different assumptions about tool use and what's "efficient"... but I need some RPM settings I can get behind.
I want to do something right, so I'm doing it myself.
I learned how to program an RPM ("Speeds") calculator in Excel 2010 so I can derive my own speeds chart. It's handy because I can add any materials I like at any time as long as I can provide that material's SFM*.
(For those of you new to the game of rotary cutting tools, the "Speed" measures how fast the spinning element spins; the "Feed" measures the speed of pushing the cutting tool into the material. Necessary for clean, safe, repeatable cuts!)
I made this at Techshop Detroit (www.techshop.ws
) and it's proven to be USEFUL!
*Going to explain that in a bit.