A shop trick for making do and/or saving money.
I’ve been tapping threads most of my life and only today, at the age of 39, did I buy my first bottoming tap. Depending on what you want to do, hand taps for a given thread come in a few shapes. Most weekend warriors are familiar with taper taps, but when you need to get threads to the bottom of a blind hole they won’t do:
Now today may be the first time I’ve actually bought a bottoming tap but I do own a few. Here’s the tip: Whenever I’ve needed one I would take the taper tap for the thread I want, grind the tip off, finish the job, and then replace the taper tap at my leisure; possibly days later. It’s cheaper than buying a bunch of bottoming taps that you may never use.
FYI: I bought the bottoming tap today because:
1) I knew I’d be needing it to finish the job on my bench.
2) It was right where I was shopping for something else I needed.
3) It was inexpensive!
Finally: If you don’t know how to grind tools, please don’t use this advice as inspiration to go out to the shed and wreck your taps.