Page 244 - Parlec Catalog
P. 244
Insert Selection Guide
242 Inserts Information
SHAPE
SQUARE 80° DIAMOND TRIANGLE TRIGON
For rough boring through holes For rough boring to a shoulder For finishing with three corners For rough boring when large
and castings to avoid exit hole or deep bore depths where for maximum insert life. depth of cut is required or
breakout. maximum rigidity of the bar is when extreme core shift is
required. experienced.
Four usable edges for maximum
insert life. For finishing small diameters
where maximum edge strength
is required.
CARBIDE GRADE:
Select the proper insert grade from pages 258-259. Material type, machine capabilities and type of hole, i.e.,
Interrupted Cut, can affect the grade of carbide used.
Coated
Longer service life at higher speeds.
Uncoated
Less expensive and effective in materials for which coatings do not add any benefit.
Cermet
Yields the highest speed and durability for selected materials.
RADIUS:
Finish, bar rigidity, insert life, and engineering features of the work piece all contribute to choosing the proper
insert radius.
Larger
Better surface finish and longer insert life.
Smaller
Less cutting pressures, in extreme conditions, reduced bar flex and chatter.
PERIPHERY:
Pressed
Utility grade for general purpose. Longer tool life.
Ground
Better for finishing where tight bore tolerances are required.
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