05-29-2014, 04:58 PM
(05-29-2014, 10:04 AM)chucketn Wrote: I think the short drills are spotting drills. Can anyone post a picture of a spotting drill, jobber length, and regular drill bit so I can get an idea of length, please?
What is the attack angle on a spotting drill?
Chuck
The short drill in the top-middle photo are simply "screw machine length" drills.
All the drills in the top-right photo are "center drills", sold by Keo (and other makers) as "combined drill and countersink." As most appear to be, they are the common 60º included angle except for perhaps the last one on the right which may be a 90º one. Three of them have one broken end, the common failure which is why I now use 90º spotting drills when I need one, and center drills only for making center on parts to run between centers on the lathe.
I'll see if I can get a photo of the spotting drills I have.