Why the different finishes on HSS drills?
Black are cheaper - any performance difference?
Jordan
- posted
15 years ago
HSS drills - black or silver?
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- posted
15 years ago
All HSS is silver , highly heat treated and very hard .
China makes forged , black bits they call HSS . Much more brittle and not as tough as HSS . HF sells them and sometimes T.I.N. coated . ________________________________
Jordan wrote:
China makes forged , black bits they call HSS . Much more brittle and not as tough as HSS . HF sells them and sometimes T.I.N. coated . ________________________________
Jordan wrote:
- posted
15 years ago
Go to mcmaster and read about drill bit finishes it explains them great
- posted
15 years ago
Thanks. Looks like polished is good for ferrous and non-ferrous, but
black not recommended for non-ferrous metals. Well, I've used them on
aluminium and they seem to work OK.
Some of my black drills are Czech and German, marked HSS.
Jordan
Some of my black drills are Czech and German, marked HSS.
Jordan
- posted
15 years ago
snip-
They work fine, but tend to allow streaking and chip welding of the parent metal. It can be the source of considerable irritation if you're drilling soft aluminum, but, like you, I use them that way all the time. Lubrication works wonders towards limiting such problems.
Harold
They work fine, but tend to allow streaking and chip welding of the parent metal. It can be the source of considerable irritation if you're drilling soft aluminum, but, like you, I use them that way all the time. Lubrication works wonders towards limiting such problems.
Harold