Hi. I'm a newbie on the forums. What an incredible amount of information here! I hope someone can help me.
I have only a small amount of metalworking experience... I just know the basics and that's fine, it's not my main thing (electronics is).
I want to drill a hole with my mini lathe, in three or four different metals, to fit a 12.0mm dia insert into, in such a way that it is snug but not necessarily wedged in for ever.
I have a 12mm drill bit which (as I was expecting) makes a hole slightly too big.. the insert has free play.
Given the cost of decent 11.x mm drill bits, I don't want to buy 11.6, 11.7, 11.75, 11.8, 11.9 (you get the picture) just to find out which works best, if I only need to buy one or two.
So which do you think I should buy?
The 12mm dia (exactly, according to my micrometer) inserts are chromed brass. The four metal rods are about 30mm diameter in aluminium, copper, stainless steel and brass.
Thanks for reading, and thanks in advance for any help.
Norman