1

**G-Code, CAD, and CAM discussions / Speed Feed and Depth per pass question**

« **on:**June 10, 2008, 10:17:54 AM »

Hello,

I have a Bostomatic 312 Milling Center I Converted to Mach and Rutex. Pretty stout machine. I'm having a problem calculating the proper speed feed and depth of cut. I've been staring at formula after formula but I think I am missing something along the way. Here's my question:

I want to pocket mill some 304 stainless .1875 thick with a 3 flute .375 carbide end mill, coolant on.

Textbook calculations look like this:

(numbers are tool manufacturer recommendation)

RPM: 150 x 3.82 / .375 =1528 (SFM x 3.82 / tool diameter)

Feed: 1528 x .001 x 3 = 4.584 (RPM x chip load per tooth x number of flutes)

My question:

Is the .001 x 3 or .003 chip load the same as the depth of cut per pass?

This seems to light of a cut and to slow of a speed to me.

Confused...

Robert

I have a Bostomatic 312 Milling Center I Converted to Mach and Rutex. Pretty stout machine. I'm having a problem calculating the proper speed feed and depth of cut. I've been staring at formula after formula but I think I am missing something along the way. Here's my question:

I want to pocket mill some 304 stainless .1875 thick with a 3 flute .375 carbide end mill, coolant on.

Textbook calculations look like this:

(numbers are tool manufacturer recommendation)

RPM: 150 x 3.82 / .375 =1528 (SFM x 3.82 / tool diameter)

Feed: 1528 x .001 x 3 = 4.584 (RPM x chip load per tooth x number of flutes)

My question:

Is the .001 x 3 or .003 chip load the same as the depth of cut per pass?

This seems to light of a cut and to slow of a speed to me.

Confused...

Robert