Page 464 - Hartner

Twist drill definitions
to DIN ISO 5419 (extract: edition 06/1998)

Straight shank twist drill/ Taper shank twist drill

total length
body straight shank
flute length
tang
taper Mitnehmerlappen
(to DIN 1809)
(nach DIN 1809) taper shank
increasing
web thickness
drill Ø shank Ø
helix angle tang
land axis
taper Morse
flute
pitch

Cutting portion

point chisel edge angle
cutting lip length flank body clearance Ø chisel
lead. edge of land heel
web thickness Web
A
point angle X drill-Ø

A land width body clear. heel
chisel edge corner face minor flank flute
cutting lip core thickness chamfer
A-A
corner In context of cutting technology, land width
cutting wedge b is the body clearance land width which is
to be denoted by bfαn, see DIN 6518.

Angles on the cutting edges

definitions:
1 = feed direction
2 = feed f
3 = cutting travel per revolution (d . π)
4 = cutting direction
5 = direction of cutting motion
*) Clearance angle α, wedge angle β and the
rake angle γ are measured in the tool orthogonal
ax side clearance angle alpha) a x front rake angle (gamma) plane. For details, see DIN 6581, definitions
axe effective side clearance angle a xe working front rake angle of metal-cutting technology; geometry
ax side wedge angle (beta) a resultant cutting speed angle (eta) at the tool edge.

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