Constant
Form Relieved Knuckle Tooth
for Long Tool Life |
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| Niagara's
Roughing End Mills are designed with a constant relief form.
(FIG.1). This true form relieved design allows many resharpenings
on the flute face while maintaining the same relief angle. The
constant form relieved knuckle tooth means easy resharpening
plus consistent top tool performance even after many resharpenings. |
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Maximum
Knuckle Tooth Strength
for Heavy Duty Cutting |
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| Niagara
Roughers are designed with a sinusoidal wave form (FIG. 2).
This is a continuous radius form, going from convex to concave
to convex. This produces the strongest possible chipbreaker
formation. Wave height has been reduced to the minimum allowable
amount, providing maximum strength. |
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Staggered
Knuckle Tooth Design
for Free Cutting Action |
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Niagara's
Roughing End Mills have been designed to give optimum performance
while machining a broad range of materials. After the tools
are specially heat treated, at our in house heat treat facility,
they are shank ground and "NC" face ground between centers.
The knuckle tooth grinding is done on special "NC grinding machines
specially designed for grinding roughers. This produces an accurate
and concentric tool.
Some
manufacturers or roughers put their knuckle form on by helical
thread grinding (tap type threads (FIG. 3). In doing so, they
create an undesirable lateral angle on one side of the knuckle.
This lateral angle will drag when cutting, causing greater friction,
higher operating temperature, increased horsepower requirements,
material weld (built-up edge), reduced tool life and chattering.
Niagara
Roughers are ground perpendicular to the rotational axis of
the tool (FIG. 4). This eliminates all lateral angles which
would induce dragging of the form when cutting. All knuckles
are stepped and indexed precisely to produce an even cutting
action across the entire flute length. |
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