finish cuts

[TF Leeson]

I am new relatively new to CNC machining. Recently I got a seat at my workplace and am curious as to what sort of stock you guys are leaving on for your finish passes, WOC, DOC etc.

[jlw™]

That's a broad question. Are we talking milling or turning? What material?

[civiceg]

My average on mills is .005 on walls and .005 on floors. But it really depends on what tolerances I am trying to hold and what kind of feature. Surfacing vs Contouring etc. 

[#Rekd™]

Also depends on the wall and or floor thickness, type and make of machine, size and length of cutter etc.

[TF Leeson]

That's a broad question. Are we talking milling or turning? What material?

milling. Mostly 1018. i run a lot of 1/2 inch -1 inch 4 flute carbide EM's

[crazy^millman]

I would look to 5 or 7 flute endmills for finishing 1018. .002 to .004 per tooth chip load for finishing and max sfm the tool is recommend for. The faster if the better the finish. The slower the worse the finish.

 

Like others said extremely loaded question as many factors must be considered. I have a Ti part with .033-.08 walls thickness I and almost nothing is flat. It is being finished pretty much with ball endmills. I am leaving anywhere from .005 to .01 so I get get a chip. Any less and I run the risk of rubbing the material verses cutting the material. Ti is one of the metals that will work harden has it is cut so need to be mindful of how much stock and where the stock is.