TiN is the chemical abbreviation for Titanium Nitride, a hard ceramic material that is added as a coating to high speed steel to improve wear resistance, for edge retention and corrosion resistance on machine tools.
I swapped the end mill for one of the new ones I had just received, 6mm with a 6mm shaft. You can just see the end of the collet with it held in the mill.
In addition the finish looked much better. OK, some of this was just down to the fact that it was a new sharp end mill, but do think that TiN coating improved the cutting performance.
Price: approximately £2.50 for a 6mm end mill
Great price and must admit that I wouldn′t buy any milling bits without the TiN coating.
Available at arceurotrade.co.uk
These end mills are widely available from many different online retailers in the UK and are at a very low price and so be prepared to replace them quite regularly.
Since writing this review I have found that Dormer end mills purchased on eBay are just amazing in terms of quality and effortless cutting. Also, the solid carbide slot drills with TiAlN coating are very impressive in terms of the edge they are able to hold, high speed capability based on higher temperature that they can withstand and as a result the fantastic finish that you get as a result – e.g. Rennie Tools Carbide Slot Drill.