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No lube this time, cuts were miniscule - I used a fresh carbide insert with positive rake that seemed to do a fine clean cut and leave a very flat finish. I often use SD40 on aluminum machining, preference is a spray mister.Jim, Did you use anything for lube when cutting ?,
I had a Trained friend who did a Super job on my pistons,
Opening up the ring lands, To take bigger rings,
He used WD 40.