Inserts and their application is a discipline of its own.

These round inserts have a enormous "nose radius". They will give a better finish than inserts that have a small nose radius like a CCGT060204. A large nose radius results in large cutting forces. So these round inserts are not used for rouging but for finishing jobs on a rigid lathe.

The different colours shows different coatings and each coating is optimised for a certain material type and turning conditions.

You can also see different chip breakers. Chip breakers are also optimised for material types and turning conditions.

The shiny ones (middle row), are probably polished inserts. These polished inserts have very sharp cutting edges and are commonly used for aluminium and plastics. On non rigid lathes, polished inserts that have a small nose radius like CCGT060202 and DCGT070202 give good results when cutting steel, stainless or titanium.

Hi Sonic,

I have just purchased too holder SRDPN1010H10T3 off Ali Express (LRC TOOL OFFICIAL STORE) They supplied with it inserts RPMT1073 Other insert types were also listed.

Like Paul my intention is to use them on a ball turner

**LINK**

Regards, Neil

They work OK in a fly cutter too.

Bill

Their main use is for profiling curved items like Paul has shown, can also be useful if you need a large internal fillet and for weld prep but not really suitable as your everyday go to tool or for roughing. Not least because you can't turn upto a shoulder.

Also the 10mm insert is probably going to be too big for most hobby needs holders that that the smaller RCMT06 or RCGT06 would be better if you did want to try the round tools.