Re: Interesting Observation on ER20 Collet Holders vs. Set Screw Holders
I like the setscrew endmill holders better than ER20 holders because:
1. Cheaper
2. More rigid
3. Gives you a better view of what you are cutting
4. Easier to put an endmill in a set screw holder than in a ER20 collet holder (never really sure I get the thing tight enough).
5. Personal opinion: not convinced that cheap ER20 collets really give you enough of a difference in run-out to improve the cut quality. If I used really small end mills, I might care, but I don't.
I tend to use endmills with weldon flats because it is more convenient. Since I never buy any without, I can't really comment on how important this is.
Tim
Tormach 1100-3, Grizzly G0709 lathe, Clausing 8520 mill, SolidWorks, HSMWorks.