tooling for tough steel

[bspear]

EN24 817M40 4340 ASTM A29 tough stock with a rough finish


What would you recommend, indexable tips or carbide? this is the part I need to machine, by the 100s:





6mm (0.236) thick from 8mm (0.315) stock, faced both sides


mid recess has a 3mm (0.118) rad


currently using tips but they bang alot on this tough material like it needs a keener edge, probably have stay with tips for the facing - 45mm (1.770) wide cut but thinking about carbides for the sides and recess?


cheers,






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• Tooling steel you used

[Jim Dawson]

That looks like a nasty little part to build. But maybe not so bad with some fixturing.

Maybe look at some different insert geometry, maybe check with your tool vendor for recommendations. I would definitely use carbide endmills for the profile and interior work. Use the largest carbide bullnose (3mm R on the bullnose) endmill that would make the larger radii. I would rough it out with a rougher, then change endmills for finishing. I'm assuming you have a tool changer on your machine.

[deadlykitten]

this is the part I need to machine, by the 100s

hi begin on live tooling lathe, from circa-o90*250 stock ( imagine this setup on a spindle with bore > 90 ); finish on mill

check attached

main problem is not tooling, but fixture rigidity and costs+downtime with your actual stock / kindly

[metalmayhem]

if you go with solid carbides then I'd suggest trying Gorilla mill . Their variable flutes are pretty tough to beat , other than their sasquatch series which is incredible . They are more pricey than a lot of the other tools in the market , but in my opinion they are the best , especially for harder materials