|
Steels | Point Angle | SFM |
Steel < 180 HB | 118 | 80-110 |
Steel 180-280 HB | 118 | 45-70 |
Steel 280-380 HB | 135-140 | 30-45 |
Steel >380 HB | 135-140 | 15-25 |
Stainless Steels | Point Angle | SFM |
Stainless steel 200-300 series | 135-140 | 20-40 |
Stainless steel 400 series and PH | 118 | 30-60 |
Cast Iron | Point Angle | SFM |
Gray cast iron < 180 HB | 90 | 100-150 |
Gray cast iron 180-200 HB | 118 | 70-100 |
Gray cast iron - > 200 HB | 118 | 50-70 |
Ductile/Nodular cast iron | 118 | 70-80 |
Cast Iron - chilled | 135-140 | 25-35 |
High-temp alloys | Point Angle | SFM |
Inconel 600 series | 135-140 | 15-30 |
Inconel X | 135-140 | 10-15 |
Hastelloy | 135-140 | 15-30 |
Titanium and titanium alloys | 135-140 | 20-30 |
A-286 | 135-140 | 15-25 |
Monel | 118 | 40-50 |
Non-ferrous | Point Angle | SFM |
Aluminum and aluminum alloys | 118 | 200-300 |
Brass | 111 | 150-250 |
Bronze | 118 | 100-200 |
Copper | 118 | 100-200 |
HSS Twist Drill Recommended Feed Rates by Diameter
Diameter | Feed - IPR |
1/4" to 5/16 " | .006" to.010" |
3/8" to 7/16" | .008" to.012" |
1/2" to 9/16" | .010" to.014" |
5/8" to 11/16" | .012" to.016" |
3/4" to 13/16" | .013" to.018" |
7/8" to 1 1/8" | .015" to .025" |
1 1/4" to 1 1/2" | .020" to .040" |
Over 1 1/2" | .025" and up |