[modeleng] Re: Cast Iron Coolant

Hello Lee,

I too have always machined cast iron dry. However, a couple of days ago I 
was machining some cast iron piston valve liners and I used the coolant pump 
to cool the (stationary) liners down in order to take accurate measurements. 
The next morning I found that the cast iron swarf that had been washed by 
the soluble cutting oil had set hard and gone rusty. Furthermore it had 
rusted the bed of the lathe!
So, thats one reason not to use cutting oil unless, of course, you're one of 
those who cleans his machine down immediately after use.

Regards,

Barrie


----- Original Message ----- 
From: "Lee Grant" <leegrant@xxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Wednesday, October 26, 2005 11:58 AM
Subject: [modeleng] Cast Iron Coolant


> Hi All
> I have all ways been told to never to use coolant or cutting oil. when 
> turning or milling cast iron and never have. Has anybody got any ideas on 
> why this is.I think I was told that it would cause hard spots in the 
> iron.. You always use coolant when grinding cast iron or you will end up 
> with burn marks.
> Lee
>
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