Cutting Metal on foam

[maginter]

Hi All -

I have to do a sign job and the material is a a combination of a metal substrate that is about .030" thick that is mounted on .500 of foam. I am wanting to know what is the best cutter to use on this? I ran an 1/8" Endmill and got reasonabely preformance, but I only cut two letters. A 1/4" Endmill won't give me as good of detail on the inside corners as the 1/8". but I am concerned about the ability to run the whole job. Any reccomendations on cutters and configurations would be appreciated.

Thanks,

Mark

[signtist]

If you need to use a 1/8" bit. . . . thats the way to do it. Some jobs just take longer to cut.
John
www.signgraphics1.com

[knight_toolworks]

1/8" is fine. I just cut 1/2" sintra with one in one pass at 3ips. the one thing I found is you need to sue an upcut bit a downcut leaves a ragged edge on the top of the aluminum.

[maginter]

I was wondering if it could be done in one pass since the real cutting is taking place on the metal. Is there any manufacture of cutter that works better than another, part number, etc.? I ran a downcut 1/8" bit that I had, but it made several passes. It look OK, but I would rather get a cutter that I know will be better suited for this.

Thanks,

Mark

[garyb]

Onsrud 65-012 1/8" single flute SC "O" flute

[maginter]

Thanks for the input..... Got a good source for them?

Mark

[coach]

I get mine from www.onsrud.com
I hear you can get them cheaper from a distributor of Onsrud bits.

[joe]

I don't believe there's a better bit on the market, for this kind of work, than than the Belin O Fute. Not so expensive either!

Their bits are like jewelry and sharp too.

[maginter]

I love the Belin bits but have problems getting them. WHat supplier do you get them from?

Thanks,

Mark

[joe]

http://www.amtcnc.com/osc/index.php

I like their service.

Watch out when opening their little shipping case. These things are the sharpest on the market.