Annealed 4140

[EdK]

(01-12-2013, 01:32 PM)TomG Wrote: Ed,

I can answer that in case Ken's not around.

The F[in/rev] is the feed rate in inches per revolution, .004, .016 and .024 inches per revolution to be specific. Your lathe feed numbers are likely in inches per minute so you'll need to convert.

The larger numbers in the blue section are cutting speeds in surface feet per minute. RPM would be 4 x diameter of work / cutting speed.

In general, carbides like high feed rates to carry the heat away, so these feed rates will look fast compared to high speed steel.

Tom

Thanks Tom. That clears up quite a bit.

Another question though. In the inches per revolution, I assume they are talking about the workpiece revolution? I know, that sounds like a dumb question but math has never been my strong suit.

Thanks again.

Ed