Quote:
Originally Posted by mattr
Funny, the only drawing I could find of a 4-40 had a 100 degree countersink.
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Yeah just as funny, thought I would confirm with a google search and the entire first page results said 82 degree.
100 degree heads are more common in riveting, and you can buy pilot 1 piece cutters for this head angle. Never checked if you can get them in 82 degree.
As the other guys say, use a pillar drill, especially if your not used to drilling a lot. If you comfortable then it's not an issue to go through by hand. You really cannot go wrong with an adjustable guarded cutter, you will get exactly the same depth cut each time. with drill bits, if you use Dormer or Presto bits and don't put too much pressure on the drill they will be fine, also a cutting fluid should help. Hope I haven't over complicated this for you and good luck with your build.