Page 121 - HOLE MAKING CATALOG p001-148

Machining Conditions USER GUIDE INDEXABLE DRILLS

Cooling Methods How to Select Cutting Parameters
Directing the coolant through the tool is essential
for reliable machining. This method prevents Step 1 - Prior to Drilling
chip pile up, insert damage or breakage, • Use charts on pages 122-124 to select feed
and damage to the workpiece surface.
and speed according to workpiece material.
Internal Coolant External Coolant • For the first grade choice, in general we

recommend selecting IC808.
Step 2 - Initial Test Hole Drilling
• Evaluate chip evacuation. If not satisfactory, adjust
feed and speed, using example photos below.
• If chip evacuation is still a problem, i.e. chips are too
long, change the chipbreaker to GF as shown below.

SOMT/SOMX

Too Tight Optimal Shape Too Long

Apply standard cutting data. Drilling depth is limited
to 1.5xD. For larger
depths, a pecking cycle
is recommended.

Rotating Drills

may cause may cause
insert damage tool damage

Optimizing Chip Shape

Chip control is one of the most important factors for
tool performance in order to facilitate chip evacuation
and avoid tool damage.
Cutting conditions must be adjusted
to achieve optimal chip shape.

How To Achieve Optimal Chip Shape

Too Tight Too Long

Increase If machining at

speed within high speed, first

recommended limits. Optimal reduce speed. If

If not satisfactory, Shape unsatisfactory,

For best results: decrease feed. increase feed, but
1 Check adapter rigidity.
2 Minimize drill runout in relation to spindle center line. do not exceed
3 Use recommended cutting conditions.
upper limit.

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