On Mon, 7 Nov 2011 17:31:04 -0800 (PST), "
wrote:

I have a heat treated tube with an approximately 3/16" ID that I want
to ream out to a slightly larger dia.

The heat treat is at least 50, so I'll be using a solid carbide
chucking reamer.

So my question is, what might be an appropriate cutting fluid?

TIA

Lewis

*****

If it's RC 50 hard, you might consider lapping. Otherwise, lots of
sulfurized cutting oil, such as pipe threading oil.

Bob