Page 10 - ISCAR_ARTICLE_2020

Femoral Stem
Machining the femoral stem involves slotting, spot
milling, drilling, chamfer milling, turning, face and
profile milling.

MULTI-MASTER endmills with indexable solid
carbide heads in the diameter range of 12.7-25 mm
(.500-1.000 in) are used for slotting. Spot milling
is performed by means of SOLIDMILL endmills
with 4 flutes, 38° helix and variable pitch for chatter
dampening with 3xD relieved necks. The drilling
operation uses SOLIDDRILL solid carbide drills
with a range of 3-20 mm (.185-.765 in) and
3xD / 5xD drilling depths.

Chamfer milling uses MULTI-MASTER endmills with
indexable solid carbide heads in the diameter range
of 9.1-20 mm (.360-.750 in). ISO standard geometry
inserts with precision ground cutting edges are used
with SWISSTURN toolholders featuring JETCUT high
pressure coolant for the turning stage. INDEXABLE SOLID CARBIDE LINE
SOLIDMILL 3 flute, 30° helix short solid carbide
ball nose endmills with a 3-25 mm (.125-.625 in)
diameter range are employed for profile milling, and
SOLIDMILL endmills with 4 flutes, 38° helix and
variable pitch for chatter dampening with 3xD relieved
necks with a 1-8 mm (.125-.312 in) diameter range
are utilized for face milling.

Bone Plate
For rough milling, the FINISHRED endmill geometries
allow the tool to perform roughing and finishing at
the same time. MULTI-MASTER interchangeable
solid carbide tapered heads are applied to the finish
milling operation, whereby the curved surfaces can
be machined by tilting the tool and applying a large
corner radius at small cutting depths. Shouldering is
done with CHATTERFREE endmills, which enable
high material removal rates, eliminate vibration, and
reduce cycle time.
The final milling stage engages MULTI-MASTER
4 flute, 30° helix short solid carbide ball nose endmills
in the 5-25 mm (.190-1.000 in) range. SOLIDDRILL
solid carbide drills, with no coolant holes and 4xD
drilling depth, ensure stable and accurate drilling. Mill
threading is achieved with SOLIDTHREAD 55° or 60°
profile solid carbide taper thread mills.