VIPER DVH: 45 Degree Variable Helix – Primarily for high-speed machining of aluminum, plastics, and other non-ferrous materials including brass and bronze alloys.
Our Viper DVH series end mills are for both roughing and finishing. Since not every company has the RPM or need for high Metal Removal Rates (MRR) the Viper is the first tool of choice for aluminum and non-ferrous materials. It can both rough and finish and provides a unique method of chip evacuation due to it's PATENTED double variable helix design. The “General Operating Range” is based upon 1X diameter (ADC / DOC) in full diameter (RDC / WOC) SLOTTING. The minimum chip loads remain constant for all applications, however, the maximum chip loads can be increased for side milling applications in finishing, heavy roughing & light roughing.
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US Patent #’s 6,439,811 / 6,179,528 / 6,007,276
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Viper DVH Speeds & Feeds for "N" Non Ferrous Materials
You can also find this table on Page 26 of our catalog
Viper DVH Speeds & Feeds for "P" Mild Steel
These parameters for the "P" Mild Steel Material Group are ONLY for < 18-20 HRc (,223 - 217 Brinell Hardness). Our Raptor DVH, Raptor 3/6, and Python series end mills are better suited for the "P" Mild Steel Material group, but in a pinch the Viper's work very good here. You can also find this table on Page 27 of our catalog.
No Chatter!
One of the most common causes of chatter with our tools is running tools with TOO LIGHT of a chip load. Most chatter problems can be fixed by INCREASING the chip load per tooth (IPT)
Heavy Roughing (Side Milling) Defined: ADC (Axial Depth of Cut) = up to 1X dia.diameter RDC (Radial Depth of Cut) = 30% – 50% of diameter Light Roughing (Side Milling) Defined: ADC (Axial Depth of Cut) = up to 1X diameter RDC (Radial Depth of Cut) = 15% – 30% of diameter Finishing (Side Milling) Defined: ADC (Axial Depth of Cut) = up to 1X diameter RDC (Radial Depth of Cut) = 4% – 15% of diameter You can read more about common machine problems on our End Mill Troubleshooting page. |
Imperial
SFM = RPM X .262 X Tool Diameter RPM = SFM X 3.82 ÷ Tool Diameter IPM = RPM X IPT (CLPT) X Number of Flutes IPT = IPM ÷ (RPM X Number of Flutes) MRR = RDC X ADC X IPM (a.k.a. CIM) Metric
SMM = RPM X .00314 X Tool Diameter RPM = SMM X 318.057 / Tool Diameter |