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> 1" s&d hss silver & deming drill bit, 1/2 shank.
1" s&d hss silver & deming drill bit, 1/2 shank.
We hope you find the following technical information useful.
FEEDS AND SPEEDS FOR HIGH SPEED STEEL DRILLS.
DRILL DIAMETER IN INCHES FEED IN INCHES PER REVOLUTION.
SUGGESTED SPEEDS FOR SPECIAL MATERIALS.
DEFINITION OF FEET PER MINUTE.
The distance in feet that the workpiece surface or cutting edge travels in one minute. Surface feet per minute (sfm) is an English measurement for speed.
MATERIAL. SPEEDS IN FEET PER MINUTE.
ALUMINUM AND ITS ALLOYS 200-300
DIE CASTINGS (ZINC BASE) 300-400
MAGNESIUM AND ITS ALLOYS 250-400
MONEL METAL OR HIGH-NICKEL STEEL 30-50
STEEL-MILD .2 CARBON TO .3 CARBON 80-110
STEEL .4 CARBON TO .4 CARBON 70-80
ALLOY-300 TO 400 BRINELL 20-30
Ti-75A (COMMERCIALLY PURE) 40-60
*STEEL (OVER 450 BRINELL) 75-100
Silver and Deming drills are all purpose drills and are used wherever the maximum chuck capacity is 1/2". They are also called S&D Drills, Blacksmith Drills or Prentice Drills (Canada). All Silver and Deming Drills are 6" overall length with 3" flute
