Calculating Feedrates for drilling with the Sieg KX1

[Steve WithnellParticipant @stevewithnell34426]

 

I've been puzzling over the feed rates when drilling with a CNC. I found this table, but it doesn't link to material type. How do I calculate feed rates when drilling?

A specific would be drilling 3mm holes in EN3 square bar as opposed to drilling 3mm holes in aluminium. How do I go about calculating the feedrate in those different materials.  If I use that data, then I get to 150mm/minute in mild steel – is that about right?

Table:
 

Recommended Feeds of Various Diameter Drills

Diameter of Drill – Inches Feed Inches per Revolution

Under 1/8 001 to .003

1/8 to 1/4 .002 to .006

1/4 to 1/2 .004 to .010

1/2 to 1 inch .007 to .015

Edited By Steve Withnell on 18/07/2020 17:07:42

[Steve WithnellParticipant @stevewithnell34426]

[JasonBModerator @jasonb]

Fusion chucks out speed of 2910rpm and plunge rate of 131mm for 3mm drill in low carbon steel

[Steve WithnellParticipant @stevewithnell34426]

Thanks Jason, I calculated manually 3032 rpm and 156 mm/minute which is a bit more aggressive, but I can see that I've been a bit optimistic with the "feed inches per revolution" value. If I back it off to where it should be I get your numbers. I'll go and run with that, see how it works out!

Regards

Steve

[Author]

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