For Non-Ferrous Materials
VIPER DVH: 45 Degree Variable Helix – Primarily for high-speed machining of aluminum, plastics, and other non-ferrous materials including brass and bronze alloys.
APPLICATIONS
Tolerance
HELIX
Materials
SLOTTING
PROFILING
ROUGHING
FINISHING
Dia: -0.0001" to -0.0003"
Shank Dia: +0.000" to -0.0003"
Ball Nose: +0.001" to -0.001"
45°
SPEEDS AND FEEDS
Double Variable Helix.
Double Variable Helix – (DVH) The helix angle changes along the cutting edge which further creates an out-of-phase cutting action.
The Viper Series End Mills, use this technology to reduce chatter and to significantly increase corner strength.
Chatter?
Chatter is a result of natural harmonics built within the tool which is operating at it's own natural frequency. Because traditional end mills maintained a consistent helix angle along the length of the flute, the tools tended to get in "tune". Technically, it's called a Frequency Response Function (FRF).
The Double Variable Helix design corrects for this problem with a number of design elements which enable our tools to run at higher RPM chatter free:
Chip Formation.
Most end mills form 6’s & 9’s by moving down into the rake face into the gullet (center line) of the tool. Our tools are designed a bit differently so that the chip actually forms in the outer rake face of the tool and ejects prior to traveling into the core diameter/gullet of the flute. This is part of the reason why increasing the chip load per tooth on our end mills will often reduce the horse power load of the machine. Less energy is required to form the chip and it reduces the heat put into the cutting tool. Heat is a major cause of cutting tool failure over time, so we developed our tools to remove as much heat in the chip as quickly as possible.
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