Page 1040 - Tungaloy Catalog

Technical Reference
Drilling Tools
Nomenclature for TAC drill

Overall length
Shank length Shank
Peripheral insert
Maximum drilling depth
Flange diameter
Drill diameter Shank diameter

Flute Flange
Central insert Peripheral insert

Cutting zone of
Cutting zone of central edge peripheral edge

Calculation formulas for TAC drill

dCutting speed dWhen calculating cutting speed from number of revolutions:
(Drilling formulas)
SFM: Surface feet per minute
31. 9 %JB RPM: Revolutions per minute
4'.
Dia: Diameter
dWhen calculating required number of revolutions from cutting
speed: (Drilling formulas)
SFM: Surface feet per minute
Technical Reference øDc dWhen calculating cutting speed from number of revolutions:
4'. 9
RPM: Revolutions per minute
31.
Dia: Diameter
%JB
(Where the workpiece rotates.)
vc : Cutting speed (SFM)
Dc : Drilling diameter (in)
n : Number of revolution (min )
π ≈ 3.14 -1
14 dWhen calculating required number of revolutions from cutting
speed: (Where the workpiece rotates.)

øDc

dCalculation of table feed
v f : Table feed (in/min)
f : Feed (ipr)
-1
n : Number of revolution (min )

14–22