Rapid lead in?

[tmodcustoms]

Does the "lead in" speed the speed at which the tool leads into the part but changes to cutting or whatever when it touched the part? (meaning this is not going to actually touch the part) "lead out"" is afterthe bit has stopped making contact with the part. ? 

I have a pocket that I'm doing but I would like to have the tool enter the part slower, upon entering the part, I would like the bit to enter at a feedrate of 2ipm, but I would like the rapid movment (when the tool is moving into or back into position , preparing for the next cut, but not actually making contact with the part at this speed,  to be fast as possible, (20 ipm or so)

The speed at which the tool enters the part is  "rapid" I would like that to be 2 ipm, it quickly changes to cutting speed, but that "rapid" entry speed is gonna break bits. Im sure I'm missing something, thanks in advance for the help. 

Thaks again guys, Much appreciated! 

FILE :

http://a360.co/1XJvHO6

[LibertyMachine]

To answer your question, yes, the lead-in feedrate is theoretically where it is not touching the part. However, depending on your settings, it could actually enter the part at a higher than wanted feedrate, due to stock size, lead in strategy, etc

Me personally, I prefer the following:

Lead in, Lead out ramp and cutting feedrate all have the same value. I don't want to hear from the hypothetical crowd about shaving off .0000001 seconds from a toolpath by jacking them up.

This is what my machine would be running in aluminum (it's a beefy enough machine)