HELITANG T490 Modular Extended Flute Cutters
There are two new families of modular extended
flute assemblies with integral tapered
shank: T490 LNK BT50-FT with BT MAS-403
tapered shanks and T490 LNK INT50-FT
with DIN 69871 tapered shanks.
The endmills of both kinds carry T490 LN…T 13
inserts. Both tool families include 63 and 80 mm
nominal diameters. An assembly, that carries T490
LN…T 13 inserts, comprises a tapered shank
base unit and one or two extensions. The base units
and the extensions have a corresponding special
concave triangular shape and recesses that allow
assembly and torque transmission. In assembly,
these parts are properly secured by an assembly
screw. This extremely rigid connection enables
nearly the same cutting data as for integral tools.
The T490 CAP-FT family of extension units has
been expanded by adding a 4 flute density option
to the 63 mm tools and 3 new, 80 mm diameter
The combinations of the base units and the
extensions ensure a variety of extended flute shell
milling cutters with various cutting lengths and they
considerably reduce the enduser’s need for special
tools. In addition, the modular extended flute assembly
has another advantage:
In extended flute cutters, the first row inserts, which
are located near a cutter face, are involved not only
in side milling but also in face milling. Therefore they
experience harder loading and their wear is more
intense compared with the other inserts of the cutter.
In integral-type cutters, sudden breakage of a first row
insert can cause serious damage of the cutter
and even make further use of the cutter impossible. In
such a case the modular assembly has the advantage
of providing further use, by means of replacing an
All of the new extended flute cutters above have holes
for internal coolant supply.
The main intended purposes of the new cutters
are for rough milling of deep shoulders, high edges
(edging) and deep cavities.