Single vs double end end mills

Topics include, Machine Tools & Tooling, Precision Measuring, Materials and their Properties, Electrical discussions related to machine tools, setups, fixtures and jigs and other general discussion related to amateur machining.

Moderators: Harold_V, websterz, GlennW

Posts: 635
Joined: Mon Feb 23, 2009 4:25 am
Location: Saskatoon, SK, Canada

Re: Single vs double end end mills

Post by Inspector » Fri Feb 07, 2020 10:38 am

I didn't mean to say the won't work in a collet only that the plant I worked in used them in Weldon type holders and should have said without any damage to the end in the holder. It was a CNC plant and practices there would not be the same in home or small businesses running manual machines.


Posts: 238
Joined: Tue Nov 13, 2012 1:10 pm
Location: Orange County, CA

Re: Single vs double end end mills

Post by toddalin » Mon Feb 10, 2020 2:35 pm

So yesterday I needed an end mill and only the double ended bit was the right size. I looked at the bit and it said 9/16". So I pulled the 9/16" collet, and the bit slid in almost up to the "round" but would go no further.

Then I realized, while the end mill was 9/16", its "round" was 5/8" even though it doesn't appear to say this anywhere. A 5/8" collet, and the bit easily slides up onto the "round" for a firm grip and life is good.

Post Reply