The smooth surface finish of the coating minimises friction on the workpiece, which enables the chips to flow off more easily. Practical tests at Mapal have shown that, compared with ordinary reamers, the tool life for those coated with HC418 is more than double, when working with high alloy steels, as well with tough cast materials such as spheroidal graphite cast iron (GGG) and vermicular graphite cast iron (GGV). In addition, tool life is approximately 20% longer when machining grey cast iron (GG).
Mapal's entire range of coated indexable inserts for guided reamers is now available with HC418 coating.
