Coolants for Copper

beege · Nov 20, 2017

Hi,

I'm working currently with CIMCOOL 540. We have and a dramatic increase in milling of copper (C11000), and a small amount of brass. The coolant reacts with the copper, turning the coolant into shades of blue, like Ty-D-Bowl. It also has corrosive effects on my aluminum fixtures.

My query is: If you are machining copious amounts of copper, what coolant do you use, in what concentrations, and what have been your observations with whatever coolant you DO use...

TIA

Brian

jgrasty · Nov 21, 2017

I use Blaser Blasocut BC940 with their Additive M22 to prevent the coolant from changing color and prevent discoloration of copper and brass.

Jhn3:16 · Nov 21, 2017

We use a Houghton product Hocut 7060 @ 7-10% mixture. This coolant is designed for "Red" metals. It also will turn green over time from the copper but that is all we machine.
Brandon

billzweig · Nov 21, 2017

In the past the traditional medium for machining copper was kerosene. It improves the machining and finish and keeps the copper nice and bright.
When I was working (a few decades ago) in a large company making optical instruments and lenses, methanol was used as lubricant/coolant to machine brass. Provides a great finish and leaves the parts totally clean.

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Coolants for Copper

beege

Stainless

jgrasty

Aluminum

Jhn3:16

Aluminum

billzweig

Stainless

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