YEAH, BUT WHAT ABOUT SMALL ENDMILLS?
No matter what I present, I always get a "yeah, but..." from someone in the audience. Sometimes it's "...what about drills?" (We research milling. Do you go to KFC and ask "what about hamburgers?"). Sometimes, it is ".... what about small or miniature endmills?".
So, I will address this is the next couple of posts (but, not drills).
Tap testing is applicable to endmills 3/8" (9mm) and larger. With a miniature hammer, you can go down to about 1/4" (6mm) as the video shows. After all, we are hitting it (lightly) with a hammer so there are limits. But, there are other reasons as well.
Carbide is brittle. Small diameter carbide is really brittle. Small endmills break for a lot reasons other than dynamics. They break in shipping. They break from handling. They break by setting them down on a table the wrong way. The effects of runout or unbalance are magnified as the cutter diameter gets smaller. If you can't get the chips out of they way they break. If the coolant gets diverted or block for a moment they break.
To be continued....
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