Tapping A Female Thread
- Drill the hole to the correct depth, using a metal drill bit. Use the same diameter drill bit as the diameter of tap--for example, if the hole is 1/2-inch diameter, use a 1/2-inch diameter tap. Clean away any shavings from around the hole.
- Place cutting oil around the tap's thread. Then put the tip of the tap into the drilled hole, making sure the tap is 90 degrees to the hole.
- Twist the tap clockwise 1/4-turn. Then twist it counter-clockwise a little, to remove any shavings. Twist it again clockwise another 1/4-turn, before twisting it counter-clockwise to remove more shavings. Continue in this fashion until the tap reaches the end of the drilled hole. Remove the tap by twisting it counter-clockwise, and wipe away any shavings/oil from the entrance of the hole.
Making A Male Thread
- Tighten the pipe in a metal vise. Brush cutting oil around the end of the pipe.
- Fit the die over the pipe end at 90 degrees to the pipe, and slowly make a clockwise 1/2 turn.
- Turn the die counter-clockwise 1/4 turn, to remove shavings. Then make another clockwise 1/2 turn, before turning it counter-clockwise 1/4 turn, as before. Continue in this fashion until the thread's length is a little short of the die's thickness--in other words, stop threading just before the newly-cut pipe thread starts to poke out at the end of the die. Turn the die counter-clockwise to remove it from the pipe.
- Wipe any oil and shavings from the pipe thread, and remove the pipe from the vise.