Newbie questions - drilling holes in 6061
A couple of questions regarding drilling holes...
I'm using HSS drills on my machine (4000 max rpm) and according to the machinist handbook I can run full rpm (4000) for sizes up to 7/16. I think the feedrate was listed as 16 ipm.
In general how should you drill a hole (for example 3/8" diameter)?
One time drill at this size? How far to peck at a time?
Or drill a small hole first, then step up in size until you reach the size you want?
Sorry for the simple questions.
Currently I'm using G83 with 0.050 pecks (no retraction though), should I have it retract to above the surface of the material? It seemed to work ok until my china drill chuck came off the taper
Supermax YCM-40 Mill, Mach3, G320's, RogersMachine, PMDX-122 ---- Slowly coming up to speed... (that's me, not the machine)