• Please use a fine mesh filter (mesh≦ 3µm) for coolant to prevent jamming in the oil hole.
• For deep drilling with the long type drill, machining a pilot hole is recommended.
(Otherwise, centrifugal forces may cause drill breakage.)
1. Drilling a pilot hole
2. Initial cutting with the long type drill
3. Drill the deep hole
4. Drill retraction
1. Spot facing
2. Drilling a pilot hole
3. Initial cutting with the long type drill
4. Drill the deep hole
5. Breaking through
6. Drill retraction
1. Drilling a pilot hole
2. Initial cutting with the long type drill
3. Drill the deep hole
4. Drill retraction
1. Spot facing
2. Drilling a pilot hole
3. Initial cutting with the long type drill
4. Drill the deep hole
5. Breaking through
6. Drill retraction