Page 348 - Master Catalog 2017, Inch

Tool Selection Guide
Choosing the Correct Small Hole Boring Bar

2 Determine boring bar (D).
A Select shank size (D) based on your
machine’s requirements.
B Determine bore depth (how far the
boring bar extends from the holder).
Multiply bar diameter by 4. If bore depth
is less, use a steel bar. If bore depth
exceeds 4:1 ratio, use a carbide bar.
Use L1 or L4 depending on bar selected. C A B
(See recommended maximum overhang
chart on page D122.) For indexable tooling,
go to step 3. For all other tooling systems,
go directly to step 4.
C Determine lead angle (KRA). Zero degree
lead angle is used when maximum stability
is required. Lead angle may vary based on
changing conditions, such as boring in a
blind hole.

3 Determine which chipbreaker is best
for the material to be machined.
Consult the Small Hole Boring Chipbreaker
Geometry charts on pages D66–D69.

4 Determine which grade is best
for the material to be machined.
Consult the Grades and Grade Descriptions
charts on pages D70–D71.

D6 widia.com

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