Machine Tool Genome Project
  • Home
  • RCSA
    • MTGP Registry
    • Request for Artifact Test
    • Request for Best Speed
    • Chatter Analysis
  • Training

Just because they make it doesn't mean it will work.

4/21/2019

0 Comments

 
Picture
​We are carrying some of these new tool path strategies a little far. Last week I was asked to tap test a 3/8" 3 flute endmill with a 4" length of cut. They wanted to cut at full depth in aluminum. That is 10.66X the diameter! It was like measuring a wet noodle. There were no stable lobes at any speed at any axial engagement. Just because someone makes a tool doesn't mean it will work. About 40% of the carbide was removed from a cylinder to grind the flutes, so this endmill was the equivalent to a 0.225" rod as illustrated above. You can imagine how much that would flex. Even if we could find a speed to cut at, the wall would not be straight. So what to do? If the diameter of the tool could not be changed, you could go to a relieved shank with a shorter flute length and make more passes. If you select the right speed with minimum displacement (SLE) you would not get water-lining if that is a concern. If you still wanted to go in one pass, then increase the diameter (and stiffness) of the cutter. At 3/4" you would cut the L:D ratio in half. Adding more teeth would also increase the stiffness.
0 Comments



Leave a Reply.

    About Us

    Sharing information about high performance milling technologies, the result of 30 years of research.

    Archives

    August 2019
    May 2019
    April 2019
    February 2019
    January 2019
    December 2018
    November 2018
    October 2018
    September 2018
    August 2018

    Categories

    All
    Chatter
    Dynamics
    Endmills
    Milling
    Shophacks
    Testing
    Toolholders

    RSS Feed

    View my profile on LinkedIn

Machine Tool Genome Project
Copyright © 2018-2020

DISCLAIMER
  • Home
  • RCSA
    • MTGP Registry
    • Request for Artifact Test
    • Request for Best Speed
    • Chatter Analysis
  • Training