I do. For optical applications. What John said about PCD tooling. Use
moderate surface speeds, light cut depths and chip loads to induce as
little stress into it as possible, it's brittle and fractures extremely
easy. Rough, semi finish, and heat treat before finishing if dimensional
stability is important. Stress will be easily seen when viewed through
PCD tooling is not in the cards, but this is a one off so I am hoping sharp HSS
tooling will be OK. I am also going to but a very small (1.4mm) tap: What about
tapping? I am also interested in the heat treating aspect of it that you
mentioned. Do you have any more information?
Where are we going and why am I in this HAND BASKET??
PCD is ideal. You can use solid carbide. Just don't use anything coated
as edges are prepped by honing reducing keen-ness. I'd opt for two flute
bull nose tools with a .01-.015" corner radius. Keep your depths of cut
below the size of the corner radius. HSS will work, just don't expect it
to last long. Honing a small corner radius on the tool with a fine
india stone will greatly improve results and tool life.
I've never tapped the stuff. I'd try 80ish% thread, a two flute un-coated
HSS spiral point tap (at that size the choices are minimal anyway), and
use Edge Lube "wax" (not the paste) as a lubricant.
I don't have that info on hand. I'll try to get it by the end of the
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