I was re-reading an HSM serial article from late 2003 - June 2004, by Robert Bailey : a precision Ball Maker he made for his 9" SB lathe. It remains to this date one of the best articles or projects, in my opinion; though there have certainly been many great ones.
For several bolts/screws he specifies 100deg counter sunk flat head screws. Now I was aware that several different angles are used for countersinking, but most commonly I usually see 82deg.
I've been wondering about his reason for the 100deg. I can see where that wider footprint would spread the force, and since this was 1/4" material (steel) perhaps his concern was having enough material left under the screw head.
...or perhaps I've just been under the wrong impression all along and 100deg is more common for metal applications (as opposed to wood, plastic, etc..)
I would appreciate any comments from all those better informed in this area than I. ...which is pretty much everybody!
For several bolts/screws he specifies 100deg counter sunk flat head screws. Now I was aware that several different angles are used for countersinking, but most commonly I usually see 82deg.
I've been wondering about his reason for the 100deg. I can see where that wider footprint would spread the force, and since this was 1/4" material (steel) perhaps his concern was having enough material left under the screw head.
...or perhaps I've just been under the wrong impression all along and 100deg is more common for metal applications (as opposed to wood, plastic, etc..)
I would appreciate any comments from all those better informed in this area than I. ...which is pretty much everybody!
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