PREMIUM QUALITY AMERICAN-MADE CUTTING TOOLS Technical Information
DRILLS - HIGH SPEED STEEL
ELEMENT & DIMENSIONAL TOLERANCES FOR 2, 3 & 4 FLUTE DRILLS
DIAMETER AT POINT
LIP HEIGHT
SIZE (INCLUSIVE)
TOLERANCE
SIZE (INCLUSIVE)
TIV (TOTAL INDICATOR VARIATION)
+.0000 TO -.0005 +.0000 TO -.0007 +.0000 TO -.0010 +.0000 TO -.0012 +.0000 TO -.0015 +.0000 TO -.0020
OVER #81 TO 1/8 OVER 1/8 TO 1/4 OVER 1/4 TO 1/2 OVER 1/2 TO 1 OVER 1 TO 2 OVER 2 TO 3-1/2
.0020 .0030 .0040 .0050 .0060
1/16 TO 1/8 OVER 1/8 TO 1/4 OVER 1/4 TO 1/2 OVER 1/2 TO 1 OVER 1 TO 3-1/2
NOTE: 95% of drills in any one lot to fall within tolerances above. SUGGESTED METHOD OF MEASUREMENT: 1. Rotate the drill in a vee block against a back end stop. 2. Measure the cutting lip height variation on a comparator, or with an indicator set at allocation approximately 75% of the distance from the center to the periphery of the drill. CENTRALITY OF WEB
SHANK DIAMETER
SIZE (INCLUSIVE)
TOLERANCE
-.0000 TO -.0025 -.0005 TO -.0030 -.0005 TO -.0045 -.0005 TO -.0030
OVER #81 TO 1/8 OVER 1/8 TO 1/4 OVER 1/4 TO 1/2 OVER 1/2 TO 2
BACK TAPER
SIZE (INCLUSIVE)
TIV (TOTAL INDICATOR VARIATION)
SIZE (INCLUSIVE)
TOLERANCE PER INCH
.0030 .0040 .0050 .0070 .0100
1/16 TO 1/8 OVER 1/8 TO 1/4 OVER 1/4 TO 1/2 OVER 1/2 TO 1 OVER 1 TO 3-1/2
.0000 TO .0008 .0002 TO .0008 .0002 TO .0009 .0003 TO .0011 .0004 TO .0015
OVER #81 TO 1/8 OVER 1/8 TO 1/4 OVER 1/4 TO 1/2 OVER 1/2 TO 1 OVER 1 TO 3-1/2
NOTE: 95% of drills in any one lot to fall within tolerances above.
FLUTE LENGTH
SUGGESTED METHOD OF MEASUREMENT: 1. Rotate the drill in a close fitting bushing. 2. Record the difference in indicator readings of the web at the point as the drill is indexed 180º. FLUTE SPACING
SIZE (INCLUSIVE)
TOLERANCE
+1/8 TO -1/16 +1/8 TO -1/8 +1/4 TO -1/8 +1/4 TO -1/4 +3/8 TO -3/8
OVER #81 TO 1/8 OVER 1/8 TO 1/2 OVER 1/2 TO 1 OVER 1 TO 2 OVER 2 TO 3-1/2
SIZE (INCLUSIVE)
TOLERANCE (TIV)
ACTUAL DEVIATION
.0030 .0060 .0100 .0140 .0260
.0015 .0030 .0050 .0070 .0130
1/16 TO 1/8 OVER 1/8 TO 1/4 OVER 1/4 TO 1/2 OVER 1/2 TO 1 OVER 1 TO 3-1/2
OVERALL LENGTH
SIZE (INCLUSIVE)
TOLERANCE
+1/8 TO -1/16 +1/8 TO -1/8 +1/4 TO -1/8 +1/4 TO -1/4 +3/8 TO -3/8
OVER #81 TO 1/8 OVER 1/8 TO 1/2 OVER 1/2 TO 1 OVER 1 TO 2 OVER 2 TO 3-1/2
NOTE: 95% of drills in any one lot to fall within tolerances above. SUGGESTED METHOD OF MEASUREMENT: 1. Place the drill in a vee block against a back end stop, and rotate it against a radial finger stop. 2. Take an indicator reading at the leading edge of the margin on the opposite flute. 3. Repeat for the other flute and note the difference between the two readings. 4. The deviation in flute spacing is equal to one-half the difference between the two readings.
INCLUDED POINT ANGLE
SIZE (INCLUSIVE)
INCLUDED ANGLE
TOLERANCE
±5º ±3º ±2º
118º 118º 118º
1/16 TO 1/2 OVER 1/2 TO 1-1/2 OVER 1-1/2 TO 3-1/2
MADE IN THE USA
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