- Joined
- Jan 2, 2018
- Messages
- 586
I did a test between spotting drills( Keo) and split point stubbies- 1/4,3/8 and 1/2. The stubbies were new USA models. After drilling about .1" deep in 6061 alum. I then put layout fluid on the indent and then used a pointed edge finder to make an indentation in the hole. I inspected under 40x with a nikon microscope.Sizes 3/16 1/4 and 3/8. I doubt the 3/16 will, but will the others?
The split point stubbies were off center by .003 to .004. The spotting drills were dead center every time.