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Steve do you have a 4th axis for your mill? Cranks and Cams are fairly easy with a 4th. You can turn the blanks in the lathe to rough out and do all the offset work with the 4th. In bigger stuf we used round for the blanks to save time then did all the work on the mill and 4th
Steve , if the cam lobes are individual pcs. soldered on a shaft , then why not do the lobe profiles on the mill. Bore the shaft hole first , and clamp thru the bore to hold , and machine the profile. Lot faster.
Steve we have run flat lobed cams and flat lifters well over 11k rpms in race engines.