We have found a 5 Flute Variable Pitch High Performance ALTIN Coated End Mill is giving the best performance when running an Optimized Tool Path like Volumill, DynamicMill or iMachining. The Variable Pitch Breaks up Harmonics, the 5 Flutes gives a strong core diameter while allowing you to keep the feed rate up.
The Speeds/Feeds to run these tools at Depends on the Diameter and the Length of Cut of the Tool, so we grouped every tool into 3 different Tiers Depending on the Length to Diameter Ratio (Using a Stub or Regular Length End Mill will give you the best Metal Removal Rates and is the first choice):
- Stub: Around 1.5XD-2XD
- Regular: Around 3XD-5XD
- Long: Around 6XD-8XD
Select a Diameter x Length of Cut Below to see DynamicMill, VoluMill, iMachining or Optimized Tool Path Speeds & Feeds for Alloy Steels like 4140, 4340, or 8620:
