Vietti--I don't run my mill in reverse with a boring tool in it, because I am afraid the boring head will unscrew itself apart and cause a disaster. Not all boring heads will do this, but mine will.---Brian
Separating the cam blanks by grooving first gives you free air to put on the cut and run the tool out at the end of each of the three lobes.............., instead of using the recessed grooves between the cams, then turning shafts down to size and the grooves after making the cams? If the original is a bar with centres in both ends, then this means the final lathe setting can be between centres and accuracy is maintained.
It's been mentioned to Brian before...... But you know, some times them old dogs......It's curious that no one mentioned that it's best to only use a drill chuck for drilling. A chuck will flex on high lateral loads thereby causing chatter and inaccuracies. Yes I'm guilty of it also but only when counterboring holes with an end mill. Even then you have to be careful otherwise the end mill will turn into an ugly boring bar.
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