Page 879 - Tungaloy Catalog

Technical guidelines

d Criteria for head change (Criteria of tool life)
The following are general parameter criteria for enhancing tool life and identifying tool
changes.

0.008" - P P x 1.25
0.012" ø > øDc + 0.006"
Ra
ø = øDc
0 ø < øDc - 0.001"

0
Width of corner wear Spindle load: Increased Hole diameter: 0.006" Surface finish: Monitor Abnormal noise, or
should not exceed: by 25% higher than larger or 0.001" smaller surface finish quality as vibration
0.008" - 0.012" starting load than drill diameter the drill begins to wear

d How to clamp the drill head

➀ Cleaning the pocket and oiling ➁ Set the drill head in the pocket

Air blast etc.

➂ Set the clamping key on the drill head ➃ Clamp

11

d Coolant supply Drilling Tools

Internal coolant supply is The coolant flow and pressure required
recommended. Please always use coolant supply to evacuate chips.

30 1.75 L/D = 8
Coolant flow Q (liter/min) 10 Coolant pressure (MPa) 1.25 L/D = 5
1.5
20
L/D = 3
1.0
0.75
0.5
5

0.315 0.472 0.629 0.783 0.25 0.315 0.472 0.629 0.783
Drill diameter: øDc (inch) Drill diameter: øDc (inch)

Relating Cutting Conditions Technical reference 11–63
pages (11-14 ) (14-1)