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FEEDS AND SPEEDS FOR TWIST DRILLS

 

FEEDS FOR HSS TWIST DRILLS

DIAMETER, IN. FEED, IPR
UNDER 1/8" 0.001" - 0.002"
1/8" - 1/4" 0.001" - 0.004"
1/4" - 1/2" 0.004" - 0.007"
1/2" - 1" 0.007" - 0.015"
1" AND OVER 0.015" - 0.025"

 

SPEEDS FOR HSS TWIST DRILLS

MATERIAL SPEED, SFM
Aluminum Alloys 200-300
Brass. bronze 150-300
High-tensile bronze 70-150
Zinc-base diecastings 300-400
High-temp alloys, solution treated & aged 7-20
Cast iron
    soft
   medium hard
   hard chilled
   malleable

75-125
50-100
10-20
80-90
Magnesium alloys 250-400
Monel or high-Ni steel 30-50
Bakelite and similar 100-300
Steel:
   0.2% - 0.3% C
   0.4% - 0.5% C
   tool, 1.2% C
   forgings
   alloy, 300-400 Bhn

80-100
70-80
50-60
40-50
20-30
High-tensile steel:
   heat treated to 35-40 Rc
   heat treated to 40-45 Rc
   heat treated to 45-50 Rc
   heat treated to 50-55 Rc

30-40
25-35
15-25
7-15
Maraging steel:
   heat treated
   annealed

7-20
40-55
Stainless steel:
   free machining
Cr-Ni, nonhardenable
straight -Cr, martensitic

30-100
20-60
10-30
Titanium:
   commercially pure
   6Ai-4V, annealed
   6Ai-4V solution-trt & aged

50-60
25-35
15-20
Wood 300-400

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Copyright 2000 ZABEL PUBLICATIONS
Last modified: October 02, 2001