Trick for Cleaner Threads
Use this tip to square your tap with the hole.
The next time you have to tap a hole in metal—perhaps when building a jig with an aluminum part or two—try this simple trick for starting the tap square with the hole. Into a small block of wood, use your drill press to make a hole that snugly fits the tap. Place the block over the hole in the metal and let the block guide the tap at 90°. Remember to use cutting oil.
Have a shop tip to share? Email us your tip, photos or drawings, and contact info. Published tips earn money and tool prizes.