A couple weeks back I mentioned my discovery that tapped holes should be lightly countersunk. The funnel helps direct the screw into the threads. Today I was doing a mass production of sleeves for ScopeRoller, and I looked carefully at the tap/drill combo that I use for 1/4"-20 holes. What is that above where the tapping threads stop. It appeared to be a countersink. Sure enough, when I took the tap/drill combo all the way down to the surface, there was a slightly unpleasant clatter, but the holes are now countersunk. The screws slide right into the threads. That is one less step that I need to perform when making these. That's one less tool change when making them, and to be blunt, my countersinking was not beautiful. Worse, after countersinking, I usually needed to tap the hole again.
Let me again sing the praises of Tapmatic.
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