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15 Solid carbide drilling Technical Information 160° 128° 160° 128° Δ 1 2D Δ 1 2D Deep hole Ø D Tolerance h6 Tolerance m6 De ep Hol e Dril l W TX – Mic ro pi lo t W TX – Mi cr op ilo t De ep Hol e Dril l Max dimension Pilot hole Ø D Min dimension The following must apply to use the pilot and deep hole twist drill consecutively and without collisions ∆D ØD pilot hole – ØD deep hole > 0 With an angled drilling application the remaining depth of the pilot hole will change depending on the angle of inclination This can be determined using the formula below The maximum hole depth incl 90° countersink can be found using the formula below DC 1 Cutting diameter SDL 1 Step length max 2 5xDC 1 α Component surface angle of inclination max 50° L Remaining pilot hole depth DC 1 Cutting diameter DC 2 Max countersink diameter SDL 1 Step length max 2 5xDC 1 L Max hole depth incl countersink L SDL 1 – DC 1 x tan α Calculating pilot hole depth with angled drilling application Calculating maximum hole depth with 90° countersink Tolerances and angles SDL 1 SDL 1 L 45° α L DC 1 DC 2 – DC 1 + SDL 1 2 L DC 1 DC 2