Gunther wrote:Hello to all. For you tri-gear folks, how did you dimple/countersink the tunnel Z for the 3/16" tri gear machine screws (MS-24694-S54)? What method provides the best results?
Sonex suggested making a die with a 100 deg countersink and dimpling the 0.032 tunnel Z into the die with a 3/16" flush head machine screw. This method tends to distort the surrounding metal and the dimpled hole becomes much larger than 3/16", measuring about 0.221 - 0.225".
I also tried a #10 dimple die and c-frame from Cleveland Tools and it makes a beautiful dimpled hole much larger than 3/16" and #10 as well, even when starting with the smallest possible pilot hole, #13. I also find that the dimpled 0.032 bottoms out in the counterbore unless bored to the absolute max depth of a knife-edged hole.
I obviously don't know what I'm doing. Any thoughts and suggestions are most welcome.
Gunther
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