Viper DVH Speeds & Feeds

Viper DVH Speeds & Feeds
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.
US Patent #’s 6,439,811 / 6,179,528 / 6,007,276

Viper DVH Speeds & Feeds for "N" Non Ferrous Materials

You can also find this chart on Page 26 of our catalog
You can also find this table on Page 26 of our catalog
  • Ramp Angle Entry: 3° - 10°
  • Slotting Straight Entry: Reduce feed by 25% under or at full diameter engagement.
  • Slotting Roll-In Entry: Reduce feed by 25% under or at full diameter engagement.
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You can also find this table on Page 26 of our catalog

Viper DVH Speeds & Feeds for "P" Mild Steel 

You can also find this table on Page 27 of our catalog
You can also find this table on Page 27 of our catalog
  • Ramp Angle Entry: 1° - 3°
  • Slotting Straight Entry: Reduce feed by 50% under at full diameter engagement.
  • Slotting Roll-In Entry: Reduce feed by 50% under at full diameter engagement.
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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