Ok, how about a process question, not so much a smartcam question.
I have a silicon bronze casting, it has a cored hole, approx 1.0 dia X 5.0 deep that I have to finish out to 1.250 dia.  I want to take a 1.0 dia indexable, extended, endmill and helix mill down the cored hole to ensure centerline is where I want it, then pre-size it, then finish bore it. 
Any recommendations on axial length of the helix?  I currently have it set at a 1.20 dia helix with a .100 axial cut per revolution.  Using a 2 fluted indexable endmill, I realize this is only moving a .100 radial value on the centerline, and am a little concerned about healing out.  I will be going 2.5 inches down from both ends to clean up, prior to pre-sizing from one end. 
Anybody done this type thing before?  Any suggestions for me?
Thanks gang
Jon

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