Hey Nexy;
I highly recommend that you
don't buy one of those cheap Tap & Die sets. Decide what size machine screws you want to use (probably 8-32) and buy a single good quality Spiral Point Tap, and a matching Screw Machine Drill Bit (or two). And a tap handle. Together, they will cost less than one of those cheap sets, and they will be far more enjoyable to use.
For 8-32 in aluminum, you want a #36 drill bit. For 10-32, a #21.
I went over all about tapping holes here in my metalworking thread:
A quick introduction to tapping; making threaded holes in your custom bass hardware.
There are many different types of taps, made for different purposes. Here are a couple:
These are all 10-32 size.
This is what's commonly called a Utility Tap or a Standard Tap. They are usually 4 straight flutes with a straight tip. This is the style of tap found in the big Tap & Die sets. They are designed to be turned by hand, in a forward/back motion. 1/2 turn in, 1/4 turn back, etc. etc. Very slow and tedious. It cuts the chips as a bunch of small C-shaped bits. These...
And:
Okay, back to the method of tapping holes; cutting threads in small metal parts.
I'll talk about:
- Hand tapping
- Hand tapping with a Hand Tapping Machine
- Power tapping
These are the basic tools for hand tapping threads in small parts, like bridge parts for a bass.
In the center is the tap itself. As we discussed in a previous post, there are different types of taps available. For small aluminum and brass parts, I recommend that you get a good quality 2-flute Spiral Point Tap, sometimes called a Gun Tap. Buy the specific sizes you need. They are made to tap...