[CNCRob]

One question,

What kind of foam are you guys using? I have tried the blue and the pink kinds that you find in hardware stores. Are there other kinds better suited to machining?

The Pink is hard, and not very dense. It cuts fine with regular carbide mills.

The blue seems softer, yet denser, and is more finicky. It tends to shred (leaves a shaggy form of loose material behind). I used a toolpath option that combines upward and conventional milling. I noticed that shredding only occurs in one of the two directions so going with either upward OR conventional milling is probably the answer. I guess trial and error will help me figure out which is better.

BTW, I was running this at 4000 RPM (the limit on my knee mill), so melting wasn't a problem for me.

Carlo

I have seen a lot of people use Depron Foam, Ive seen it for mail order, but im not sure what kind of store would have it locally, Maybe someone else will know.

[CNCRob]

I have seen a lot of people use Depron Foam, Ive seen it for mail order, but im not sure what kind of store would have it locally, Maybe someone else will know.

I think depron maybe the insulation kind you are already using. I will see if I can find the name of the other kind im thinking of.

[CNCRob]

I think depron maybe the insulation kind you are already using. I will see if I can find the name of the other kind im thinking of.

Well maybe it is depron, after looking I believe the other(blue and pink) is fan fold foam.

[HayTay]

FOAM FAQ from FoamFLY

[cbass]

Well maybe it is depron, after looking I believe the other(blue and pink) is fan fold foam.

That does look more or less like what I've used, only the stuff I use comes in 3/4, 1, 1.5 2, and I believe 3 inch thicknesses. 2x10 ft sheets. Its sold as insulation I think.


I just looked at it and it says its made by DOW and they call it Extruded Foam Insulation. It also says "Styrofoam".

http://www.dow.com/styrofoam/what.htm


Carlo