Mike W1
Active Member
Some of you fellows obviously know lots about machining and tools. I DON'T!!!
Only need to deal with the few sizes of small ones I own which are 6:32, 8:32, 10:24 and a 10:32 I have need of. They've been purchased at a small hardware store and selection was pretty limited.
I store them in small pill bottles and foolishly did not save the factory labels but did record the tap size and pilot drill sizes at least.
It didn't even take me long to figure out there must be another type tap than I have as I always had to drill the hole a little deeper so as to be able to thread my hole clear thru. Apparently I need what Wilkopedia refers to as a bottoming or plug drill. I "think" the ones I had were marked NC though it's possible it was NF.
I haven't a clue what those 2 terms mean though.
Perhaps some of you can enlighten the unknowing a bit. Wasn't having much success finding anything real useful on my google searches. The ends do have a very definiite taper but I can't say which of the lower 2 in the drawing they might be.
Only need to deal with the few sizes of small ones I own which are 6:32, 8:32, 10:24 and a 10:32 I have need of. They've been purchased at a small hardware store and selection was pretty limited.
I store them in small pill bottles and foolishly did not save the factory labels but did record the tap size and pilot drill sizes at least.
It didn't even take me long to figure out there must be another type tap than I have as I always had to drill the hole a little deeper so as to be able to thread my hole clear thru. Apparently I need what Wilkopedia refers to as a bottoming or plug drill. I "think" the ones I had were marked NC though it's possible it was NF.
I haven't a clue what those 2 terms mean though.
Perhaps some of you can enlighten the unknowing a bit. Wasn't having much success finding anything real useful on my google searches. The ends do have a very definiite taper but I can't say which of the lower 2 in the drawing they might be.