Swede,
Whose tools are you looking at? The coatings are typically used to prevent the heat from attacking the carbide. Some offer abrasion resistance for materials which are abrasive.
If you have a catalog of the tooling vendor they usually have a chart with recommended speeds and feeds, DOC, and materials. I would consult those. I used to think the data was all BS and proaganda, but my experience in aerospace taught me that the manufacturers tested and created those parameters to help the end user. The paramters seemed vague and very general. This is due to the variety of equipment available and the variety of workholding set ups.
As for the ceramic and CBN materials, CBN is very expensive and usually used for very abrasive materials. Ceramic is awesome. It is very untolerant of vibration, and needs to run at a minimum of 900 SFM. usually, feed and spindle speeds limit the application of ceramics on anything less than high temp alloys. You could adjust DOC to get the 900 SFM but you might find that a little intimidating if the DOC is already farily heavy.  |