Page 880 - Tungaloy Catalog

 Applications not recommended  Run out
Run out less than 0.0008" is recommended.

Drilling on Max. 0.0008"
slanted Plunging
surfaces
θ

θ > 6°
Max. 0.0008"

Other recommendations

Prior to using 8 x D drills, it is recommended to drill a 1.5 x D pre-hole
using a short or centering drill.
➀ ➁ ➂ ➃

➀ Pre-hole 0.5 x D deep for
centering
0.5 x D 0.5 x D 0.5 x D ➁ Slow rotation and feed during
entrance to the pre-hole
8 x D ➂ Maintain for 2 - 3 seconds
and activate the cooling
system
➃ Continue drilling at
11 recommended cutting
conditions
Drilling Tools Recommended holders on M/C

First recommended holder

Power chuck Collet chuck Side lock

11–64 Relating Cutting Conditions Technical reference
pages
(11-14 )
(14-1)