Jelly_Sheffield
Member
- Messages
- 129
- Location
- Sheffield, UK
Out of idle curiosity, what are people's preferences for general turning inserts?
Everything has it's place and all, but what are the two or three that you reach for on a daily basis and why?
I keep a couple of WNMG08 and CCMT12 tools permanently in toolholders on the lathe, and a selection of CCMT06-12 boring bars.
I tend to work with WNMG080408 inserts as my go-to with MP35 CVD coated inserts for roughing and CM20 Cermet (not carbide) for finishing.
The CCMT holders usually have a one PC25 insert which gets used for turning diameters under 15mm (they seem to tolerate being run under-speed much better than a WNMG insert of the same grade), and an M250 insert for roughing stainless (the CM20 Cermet is still better for finishing)
The boring bars tend to run similar CCMT inserts, but I will run CCGT060202 inserts in US05 grade if I'm chasing very tight tolerances in small holes.
Normally working with 080M40 (EN8/1045) or 826M40 (EN26W/4330V), 316 Stainless, or O1, S1, and H13 tool steel.
Brass/Bronze has different inserts in their own drawer or I might go for HSS if I can find an appropriately shaped tool in the big drawer of doom.
Thing is... I don't really know how I arrived at that as a good default, I just trialed various inserts until I found performance I liked.
Has anyone been more scientific in their insert selection or have suggested insert geometry and grades for different work?
Everything has it's place and all, but what are the two or three that you reach for on a daily basis and why?
I keep a couple of WNMG08 and CCMT12 tools permanently in toolholders on the lathe, and a selection of CCMT06-12 boring bars.
I tend to work with WNMG080408 inserts as my go-to with MP35 CVD coated inserts for roughing and CM20 Cermet (not carbide) for finishing.
The CCMT holders usually have a one PC25 insert which gets used for turning diameters under 15mm (they seem to tolerate being run under-speed much better than a WNMG insert of the same grade), and an M250 insert for roughing stainless (the CM20 Cermet is still better for finishing)
The boring bars tend to run similar CCMT inserts, but I will run CCGT060202 inserts in US05 grade if I'm chasing very tight tolerances in small holes.
Normally working with 080M40 (EN8/1045) or 826M40 (EN26W/4330V), 316 Stainless, or O1, S1, and H13 tool steel.
Brass/Bronze has different inserts in their own drawer or I might go for HSS if I can find an appropriately shaped tool in the big drawer of doom.
Thing is... I don't really know how I arrived at that as a good default, I just trialed various inserts until I found performance I liked.
Has anyone been more scientific in their insert selection or have suggested insert geometry and grades for different work?