Milling styrofoam board enquiry

**Leadhead** · 10-06-2017

I use downcutters with some success on blue Styrofoam. Both in 8mm and 2mm. But lately broke the 2mm on another job and looking for a re-source should you find one?
The finish was marginally better and surface stringing much better. Not to the same degree as wood downcutting, as you might expect. But for me better!

**marbles** · 11-06-2017

Thanks. I bought a couple of 4 flute upcutters recently but your right I should try a new sharp downcutter to compare. Looking at the endmills specifically sold for polystyrene and foams lots of them are upcutters but what i am adviced is to run these bits below 6000rpm so just about to see how my spindle, which currently has a minimum of 12,000rpm likes running at half that.

**Ger21** · 11-06-2017

Try doubling your feedrate.

**cropwell** · 13-06-2017

Originally Posted by Leadhead

I use downcutters with some success on blue Styrofoam. Both in 8mm and 2mm. But lately broke the 2mm on another job and looking for a re-source should you find one?
The finish was marginally better and surface stringing much better. Not to the same degree as wood downcutting, as you might expect. But for me better!

https://www.sorotec.de/shop/Cutting-...l/2-Flute-366/

Rob