I have some Si-Bronze that I turned in nice long curls. It was
so pretty that I put paper down to collect the gold.
I thought that some day I might want to use them as hair curls in a figure.

I was making a tool for the lathe - these were the nuts and double nuts
for End mill and Morse tapers that then are locked into the spindle.
One end screws into the lathe nose gear and the other end locks down on
the far end of spindle. Common on lathes and mills.

Martin

On 12/25/2011 10:23 AM, Ed Huntress wrote:
On Sun, 25 Dec 2011 11:10:16 -0500, wrote:

On Fri, 23 Dec 2011 12:35:47 -0500, Ed Huntress
wrote:

On Fri, 23 Dec 2011 10:28:50 -0500,
wrote:

Any here have some real experience machining bronze castings? I have
to do a job with a 4"deep bore 1.750 dia. and a 32 finish. Can I do
it with a long carbide end mill? I use 4" LOC hanita vari-mills in
cast iron and they leave a really sweet looking finish when they are
new. (when they get dull the start to chatter).

Or is this boring head territory? I have a tooling guy quoting me
some boring heads.

Remove 333 to reply.
Randy

I have only slight experience with manganese bronze turning and
boring, but be aware that just "bronze" isn't much help in figuring
out how to machine it. Different grades of cast bronze range from 8%
to 90% of the machinability ratings of free-machining brass. If you
know what you have, I can give you its machinabilty rating.

Some of them are exceedingly tough and gummy. Others cut like yellow
brass.


Bronze per ASTM CA836 ( 85-5-5-5)
Remove 333 to reply

Aha. Ounce metal, formerly known as "leaded red brass."

Machinabilty, 84% of free-machining leaded yellow brass. 'Piece of
cake.g