11-09-2019, 10:43 AM
(11-09-2019, 09:39 AM)Bob Culver Wrote: Nitriding alone is expensive.
Were Phoenix cranks ground again after nitriding, or just linished, or neither?
From a chat I had with the bloke there who does the grinding at Phoenix: before Nitriding the crankpins are ground .008" oversize, after Nitriding, the pins are ground to finish size on an indexing grinder (i.e. not a Prince style follower setup) which would deal with any minor distortion during the Nitriding process. Also, the Nitriding treatment is at it hardest at .004" below the treated surface, hence the significance of the .008" diameter initial grind.