Machinery's Handbook, 31st Edition
1190 MICROFABRICATION PROCESSES AND PARAMETERS Table 10. Commercial Microdrills Drill diameter Standard flute length Extended flute length
Overall length Shank diameter
(mm)
(inch)
(mm)
(inch)
(mm)
(inch)
(mm)
(inch)
(mm)
(inch)
0.102 0.0040 1.016 0.040 1.778 0.070 38.1 0.127 0.0050 1.524 0.060 2.286 0.090 38.1 0.150 0.0059 2.032 0.080 3.048 0.120 38.1 0.160 0.0063 2.032 0.080 3.048 0.120 38.1 0.170 0.0067 2.032 0.080 3.048 0.120 38.1 0.180 0.0071 2.540 0.100 3.810 0.150 38.1 0.191 0.0075 2.540 0.100 3.810 0.150 38.1 0.201 0.0079 2.540 0.100 3.810 0.150 38.1 0.211 0.0083 2.540 0.100 3.810 0.150 38.1 0.221 0.0087 2.540 0.100 3.810 0.150 38.1 0.231 0.0091 3.810 0.150 5.588 0.220 38.1 0.241 0.0095 3.810 0.150 5.588 0.220 38.1 0.249 0.0098 3.810 0.150 5.588 0.220 38.1 0.254 0.0100 3.810 0.150 5.588 0.220 38.1 0.267 0.0105 3.810 0.150 5.588 0.220 38.1 0.279 0.0110 3.810 0.150 5.588 0.220 38.1 0.292 0.0115 3.810 0.150 5.588 0.220 38.1 0.300 0.0118 5.715 0.225 7.112 0.280 38.1 0.305 0.0120 5.715 0.225 7.112 0.280 38.1 0.318 0.0125 5.715 0.225 7.112 0.280 38.1 0.330 0.0130 5.715 0.225 7.112 0.280 38.1 0.343 0.0135 5.715 0.225 7.112 0.280 38.1 0.351 0.0138 5.715 0.225 7.112 0.280 38.1 0.368 0.0145 5.715 0.225 7.112 0.280 38.1 0.396 0.0156 6.350 0.250 7.112 0.280 38.1 0.399 0.0157 6.350 0.250 7.493 0.295 38.1 0.406 0.0160 6.350 0.250 7.493 0.295 38.1 0.450 0.0177 6.350 0.250 7.493 0.295 38.1 0.457 0.0180 6.350 0.250 7.493 0.295 38.1 0.500 0.0197 6.604 0.260 7.874 0.310 38.1 0.508 0.0200 6.604 0.260 7.874 0.310 38.1
1.5 3.175 0.125 1.5 3.175 0.125 1.5 3.175 0.125 1.5 3.175 0.125 1.5 3.175 0.125 1.5 3.175 0.125 1.5 3.175 0.125 1.5 3.175 0.125 1.5 3.175 0.125 1.5 3.175 0.125 1.5 3.175 0.125 1.5 3.175 0.125 1.5 3.175 0.125 1.5 3.175 0.125 1.5 3.175 0.125 1.5 3.175 0.125 1.5 3.175 0.125 1.5 3.175 0.125 1.5 3.175 0.125 1.5 3.175 0.125 1.5 3.175 0.125 1.5 3.175 0.125 1.5 3.175 0.125 1.5 3.175 0.125 1.5 3.175 0.125 1.5 3.175 0.125 1.5 3.175 0.125 1.5 3.175 0.125 1.5 3.175 0.125 1.5 3.175 0.125
1.5 3.175 0.125 Optional geometries include: Flute lengths: standard or extended length (10–80% longer); Number of flutes: 2, 3, or 4; Included angles: 118°, 130°; Helix angles: 25°, 30°, 50°; Units: metric and US customary. Example 14: Select a microdrill and pecking cycles to drill Ø0.005 inch holes to 0.050 inch depth in titanium. From Table 10, select the Ø0.005 inch drill with the 0.060 inch standard length. A drill with extended length of 0.090 inch is unnecessary because the extra length would decrease the drill stiffness by about 56% (see Example 2). Use micromist to lubricate the drill and blow the extracted chips away. The pecking cycle in Table 11 is recommended. During the first pecking cycle, drill to 0.0100 inch depth then withdraw the tool. For the second pecking cycle, the incremental pecking depth P of 0.0092 inch is calculated from Equation (19). During the 2nd pecking cycle, the drill travels to a depth of 0.0192 inch, withdraws to remove chips, then continues down for pecking cycle #3. The incremental pecking in cycle #7 should be increased by 0.0003 inch so that the pecking cycle #8 will drill the hole to the required depth of 0.0500 inch.
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