Page 292 - Hartner

Additional technical parameters

Special point grinds for single-fluted gun drills

with recessed coolant chamber with chip breaker with chip guiding step

chip breaker ca. 30 °
15 ° +0,05 15 ° 12 ° Dx0,15
10 ° 12 ° 30 ° x12 ° x55 ° 50 ° x0 ° x75 ° 0,4 - 0,6 30 ° 30 ° 20 ° Dx0,05
Dx0,13 10 ° 12 ° 20 ° 12 ° 20 ° 12 ° 25 °
Dx0,15 20 ° D 4
D 30 ° 25 °
2 D D
D 4
D

Backtaper ratio for gun drills
(dimensions in mm)
1:600 1:800 (Standard) 1:1000

Ø 10 Ø 10 Ø 10 Ø 10 Ø 10 Ø 10 Ø 10 Ø 10 Ø 10
6 6 Ø 9,99 6 Ø 9,99 Ø 9,99 8 8
8
10
Ø 9,99 Ø 9,99 Ø 9,99 10 10
Ø 9,99 Ø 9,99 Ø 9,99

Variations for drivers at gun drills with tube shank

Standard
Solution for nom.-Ø < driver-Ø
(difference must be appr. 6 mm):
tube shank installed in driver

Standard with collar
Solution for nom.-Ø - driver-Ø ~ 30 mm
(close to parallel):
tube shank installed over collar

Standard with flange
Solution for nom.-Ø > driver-Ø: ~ 30 mm and collar
tube shank installed over collar,
inside-Ø of tube shank >driver-Ø,
tube shank fits against flange shoulder.

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04_TLB.indb 286 28.11.11 11:06