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Step 4Drill and tap for your set screw
A machine screw will lock your gouge or cutting blade in place. So you need a threaded hole in the side of your steel rod near the end. If this were a naughty piercing it would be called a Prince Albert but it's not.
Look up the appropriate drill size for your tap. Mine is 5mm .8 coarse thread with a recommended drill size of 4.2mm. I only had a 4mm bit. It worked.
Finally finish off the threads in the hole with a bottoming tap. It is important that the threads are completed all the way down through the hole (or else you will have problems like stripping the threads). A regular tap won't work to finish the threads unless you use this clever workaround from Mothflavour2:
If you don't have a bottoming tap, you can still make the threads all the way through by simply drilling the hole all the way through the other side and letting the tap thread through the whole piece. That way, you end up with two tapped holes, both of which are completely threaded, yet you still have the option of only using one.
Look up the appropriate drill size for your tap. Mine is 5mm .8 coarse thread with a recommended drill size of 4.2mm. I only had a 4mm bit. It worked.
Finally finish off the threads in the hole with a bottoming tap. It is important that the threads are completed all the way down through the hole (or else you will have problems like stripping the threads). A regular tap won't work to finish the threads unless you use this clever workaround from Mothflavour2:
If you don't have a bottoming tap, you can still make the threads all the way through by simply drilling the hole all the way through the other side and letting the tap thread through the whole piece. That way, you end up with two tapped holes, both of which are completely threaded, yet you still have the option of only using one.
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