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Inconel 625 & 718


So not a Guru
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8 hours ago, huskermcdoogle said:

I have been trained to figure about 6-8 minutes planned tool life with inserted ceramic milling tools (round negative inserts) if you are running them at the optimum conditions.  Plan for using redundant spares if you need more than that and just divide up the time equally between them and change them every part.  Have spares ready outside the machine to swap it.  Roughing with ceramics is by far the fastest way to plow nickel based material off your part.  Through spindle air isn't a requirement, but is highly highly highly recommended.  It just helps to make sure the chips get away from the cutting zone and off of the workpiece.  

Most tool manufacturers recommend conventional (not climb) cutting for these round negative insert tools.  

 

and as ?Mark says: "not a drop of coolant" (for milling cutters) Thermal shock is a killer.

On the other hand when using ceramic inserts for turning, high pressure coolant is preferred.

If you get top slicing or chipping of the inserts, you are probably not using enough surface feed. 

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