Regrinding Instructions

Regrinding Instructions for AH Geometry

For each grinding operation, rotate the drill 180° and repeat the grinding procedure. 1 Primary Clearance

2 Secondary Clearance

3 Chisel

4 Edge Preparation

Grinding Wheel Recommended Specifications: 1 Diameter grinding wheel: GA2 2 Grinding wheel bond: synthetic resin 3 Grit size: 325/400 mesh (45/38µ) 4 Diamond concentration: C-75 (3.3 carat/cm3) 5 Cutting fluid emulsion 3%

Regrinding Instructions for 3 Flute SCCD Drills

For each grinding operation, rotate the drill 180° and repeat the grinding procedure. 1 Primary Clearance DAT DATDAT

20° 10˚  0.02 Shank 2 Secondary Clearance DAT DAT

20°20° 25°25°

3 Grind chisel (Thinning) 35° 30° C 40°

Ø0.25- 0.55 mm C D range 0.3-0.4 4.00-8.00 0.5-0.6 8.01-12.00 4 Edge Preparation (Honing)

DATR
A
A
RD Range
0.035-0.0454.00-6.00
0.045-0.0556.01-12.00

Grinding Wheel Recommended Specifications: 1 Diameter grinding wheel: GA2 2 Grinding wheel bond: synthetic resin 3 Grit size: 325/400 mesh (45/38µ)

4 Diamond concentration: C-75 (3.3 carat/cm3) 5 Cutting fluid emulsion 3