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Chatterless™ Countersinks Related Links
Chatterless™ Design is another Severance Tool innovation that means amazingly smooth, solid contact cutting operation and tool control.
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Recommended Countersink Speeds and Feeds
Material FEED PER TOOTH (FPT) H.S.S.
SPEED (SFM)
CARBIDE
SPEED (SFM)
ALUMINUM / ALUMINUM ALLOYS .001-.002 150-250 300-500
BRASS / BRONZE .001-.002 75-125 150-250
IRON - CAST (SOFT) .001-.002 75-125 125-225
IRON - CAST (MEDIUM HARD) .001-.002 50-100 100-175
IRON - MALLEABLE .001-.002 80-90 90-150
MAGNESIUM / MAGNESIUM ALLOYS .001-.002 125-250 250-400
HIGH NICKEL STEEL .001-.002 30-50 50-75
PLASTIC, BAKELITE .001-.002 100-250 250-400
STEEL - MILD .001-.002 70-100 80-170
STEEL - TOOL .001-.002 50-60 60-100
STEEL - FORGINGS .001-.002 40-50 50-80
STEEL - ALLOY (300-400 BRINELL) .001-.002 20-30 30-50
STEEL - HIGH TENSILE (35-45 RC) .001-.002 25-40 35-60
STEEL - HIGH TENSILE (45-50 RC) .001-.002 15-25 25-40
STEEL - HIGH TENSILE (50-55 RC) .001-.002 7-15 15-20
STAINLESS STEEL (FREE MACHINING) .001-.002 30-80 80-125
STAINLESS STEEL (WORK HARDENING) .001-.002 15-50 50-75
INCONELL ALLOY, HASTELLOY WROUGHT .001-.002 15-50 25-35
HASTELLOY (CAST) .001-.002 5-7 7-15


rpm = sfm x 3.82 + cutter o.d.
ipr - fpt x number of teeth
ipm - ipr x rpm

THE ABOVE SURFACE FEET PER MINUTE ARE TO BE USED AS A GUIDE.
USE OF GOOD QUALITY CUTTING FLUID IS RECOMMENDED.
FOR ADDITIONAL INFORMATION CALL (416) 661-3066
CNC-K™ Precision Countersink Programming/Technical Information
Designed specifically for use in NC, CNC and preset machine tools, these precision countersinks feature Chatterless™ tooth geometry Tight tolerances on angles, diameters and lengths assure setting accuracy. Available in 30°, 41°, 45°, 50°, 55° and 60° centerline angles. Other angles and sizes available upon request.
Technical and Programming Information
NOTE: For any depth the Countersink diameter expands in a direct ratio. As you travel in the (A) direction along the axis of the Countersink (X) expands in a direct relationship to angle (K) (forming an angle with the tangent of X/A).
Since the angle expands on both sides of the drilled hole; you must use 2 times the tangent of the angle for your ratio (R).
countersink programming