Originally Posted by LV2TNDM

Now as far as the home-made thread chaser goes.... Looks like a cool project. However, note that the tool you create (and hopefully from a set of steel BB cups, not Al) will not be actual tool steel, so it will dull quickly and not cut very well. Also, his cuts with the ceramic wheel seemed to leave the slot somewhat rounded. If I were cutting, I'd want the edges either vertical, or even undercut a bit so the tool can pull material away instead of just mash. This is how taps are cut in many cases. Oh, and use oil when you're using it, preferably cutting oil.