Thread: Help with a Compressor problem...

Originally Posted by david.elliott

So,
I need to use the 1/2 inch tap, or at least the one labelled that, that I was lent by BobL... Still no idea how the sizes work, BUT I do know it's a LOT bigger that 1/2 inch.

Looking at drill size I need a 45/64ths, and can find nobody that stocks one in WA. Ideas?

45/64" = 17.86 mm but seeing seeing as its only Al that is being tapped then using an 17.5 mm or an 11/16" bit should be OK.

I have one here if you need to borrow it.

If you want to get fancy you can also borrow an adjustable reamer to open up the hole a little more so the tap will bite more easily.

Practice on a piece of Al before trying the compressor,