parting tool?

[BGHansen]

I probably use a GTN-2 and 3 the most. Also use a T-shaped HSS 5/8" tall blade and MGMN200/300 inserts. I've had the same luck you did with the MGMN though it depends on the material (had good luck with aluminum and brass).

I go to back gear when parting steel with the GTN-2 or 3, had good luck with them. Also good results with stainless and drill rod.

I can't recall having a problem with the HSS with any material. I follow Tom's Technique's recommendation of sharpening the tool with each use.

Bruce

 

[jdedmon91]

Here's mine made from scrap to run a 32 mm blade upside down. The other aim was to get the blade as close to the pivot of the toolpost as possible.
Slot was cut on the mill when cutting dovetails and then cleaned up in place on the lathe. Can part off under power at turning speed.

I like that set up. I remade my parting setup so my block and GTN holder is one piece. It is thicker than yours however it has worked well

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