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USER GUIDE
THREAD DRILLING
Regrinding Instructions for AP and ACP Geometries
For each grinding operation, rotate the drill 180° and repeat the grinding procedure.
1 Primary Clearance
α° D Range
7 0.8-6.0
10 >6.1
2 Secondary Clearance
3 Chisel
α° D Range
100 3.0-4.8
105 4.9-10
95 10.1-20
4 Edge Preparation
R D Range
0.02 0.8-6.0
0.03 6.1-18.0
0.04 18.1>UP
Grinding Wheel Recommended Specifications:
1 Diameter grinding wheel: GA2.
2 Grinding wheel bond: synthetic resin.
3 Grit size: 325/400 mesh (45/38µ).
3
4 Diamond concentration: C-75 (3.3 carat/cm ).
5 Cutting fluid emulsion 3%.
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