I have a problem finish reaming 100-70-03 Durabar material. I need a finish between a 20Ra and 63Ra. Nothing we do seems to make the finish fall in that range. We changed the grind to end cutting, reduced the circular land by 30%. The cutting material is TiALN coated cermet. We ran from 400 SFM to 600 SFM with chip loads from .004 IPT to .0095 IPT. Our finish is always in the 8-12 Ra range. Also tool life is poor.
Any suggestions?
We have had success with a Madison blade type reamer for Dura bar. dont remember exactly what the finish was but was greater than 20.
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