With Greenlee punches you should not only lubricate the threads but also liberally the cutting edges too, it helps keep them nice and sharp. After all with a mill or lathe you lubricate the cutting parts too.
I use the 4x 10mm holes & a jigsaw method, mainly because I have them. Having done this a few hundred times now I can actually get it pretty close with the jigsaw so filing is kept to a minimum. I would try a dremmel if I had one.
I have a bunch of round punches but as we know the rectangular ones are a lot more expensive.
I use the 4x 10mm holes & a jigsaw method, mainly because I have them. Having done this a few hundred times now I can actually get it pretty close with the jigsaw so filing is kept to a minimum. I would try a dremmel if I had one.
I have a bunch of round punches but as we know the rectangular ones are a lot more expensive.