Page 33 - HOLE MAKING CATALOG p149-184

Regrinding Instructions USER GUIDE SOLID CARBIDE DRILLS
Regrinding Instructions for AP
and ACP Geometries Regrinding Instructions for AG
and ACG Geometries
For each grinding operation, rotate the drill For each grinding operation, rotate the drill
180° and repeat the grinding procedure. 180° and repeat the grinding procedure.
1 Primary Clearance
1 Primary Clearance
a° D Range
a° D Range 7 0.8-6.0
7 0.8-6.0 10 >6.1
10 >6.1 2 Secondary Clearance
2 Secondary Clearance
3 Chisel
3 Chisel

a° D Range a° D Range
100 3.0-4.8 100 3.0-4.8
105 4.9-10 105 4.9-10
95 10.1-20 95 10.1-20

4 Edge Preparation 4 Edge Preparation

R D Range R D Range
0.02 0.8-6.0 0.02 0.8-6.0
0.03 6.1-18.0 0.03 6.1-18.0
0.04 18.1>UP 0.04 18.1>UP

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

181