Invar36

[gcode]

Our sales department is quoting a very large project made from Invar36
Dozens of parts all one offs
a typical part  6 x 7 x 2.75 block ... a pretty simple hogout, maybe 60% of the volume milled away
They are quoting these parts 8 to 10 hours machine time, 2 operations.
My experience with Invar is limited but I'm thinking they are getting themselves a deep hole

I've always thought Invar was very difficult to machine. Is this true

[HTM01]

i believe it's very gummy

[gcode]

I found this
https://cityspecialmetals.com/invar-alloy-machining/">Free machining Invar

hopefully there is some truth to it

[mkd]

I do know that no matter how good the blade nor how strong the operator, a plate of that shit will not be cut with a handheld SkilSaw at o'dark-30.

[mkd]

nowhere near inconel, but moving in that direction

[JParis]

and it eats tools....that'll need to be planned for as well...not just the time

[CNCAppsJames]

The tool eating thing... that's no joke. Abrasive AF.

[mkd]

Used to plow the shit out of that stuff. Worked at a place in the late nineties making Bong-jigs (layup mold basically). We'd have these Jet-engine sized (Wink) weldments on a HBM just hammering away with Ø2.00" dia inserted ball endmills. They had to be Invar for the coefficient.