Standard                      Split point

        Kevlar point                  Centring point

corr. main cutting edge/   S-web thinning

corr. chisel edge

   RGR-web thinning            A-web thinning

6.2 Subland Drills

6.3 S-Point

Chamfer of S- and RGR-Web Thinning

6.5 Chamfering of the flute cutting edge

Chamfer of the flute cut

Work Piece

2 or 3 teeth

1 – 5 Steps

Cutting Edge Combination:

right helix/right cut

left helix/left cut

Produktion / Regrinding:

Production by different infeed (several steps)

Regrinding with calculation of removal

length, periphery and rake.

Regrinding, finishing with different wheels

Preparation:

Separation

Profile roughing

Profile finishing

Point:

Standard

Split point

2-facet point

4-facet point

6-facet point

Delta – point

M – point

Kevlar – point

Centring point

Milling end face

2^nd Chamfer:

Optional: 2^nd chamfer

1^st Web Thinning:

Correction of main cutting edge

Correction of chisel edge

S-web thinning (incl. Sumitomo like)

Free constructed notchings / corrections

2^nd Web Thinning

Correction of main cutting edge

Correction of chisel edge

Main Fluting:

Meas. definition: Point-/ normal cut

Grind. direction: Forward / backward

Optional spark out grinding

Separated fluting per step

Periphery:

Radial grinding / Round grinding

Transverse/longitudinal positioning

Steps

Standard step (axial/radial relief angle)

Step aperture angle: 45 - 200°

Linear relief step (aperture angle ³ 170°)

Chip Breaker

1 or 2 chip breakers per tooth

Simulation

Simulation of intersection at all operations

Machining simulation

Wheel/workpiece-simulation

Production from standard- to step drill

Special measurement and calculation

program

6.2 Subland Drills

Extension to 6.1:

Specification according to Standard-/Stepping Drills

Secondary Fluting

6.3 S-Point

Extension to 6.1:

S-point like Hertel

Extension to 6.1:

6.5 Chamfering of the flute cutting edge

Extension to 6.1:

Chamfering at cutting edge of flute:

Chamfer Angle