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CNC Foam Endmill Router Bits Cutting Specs for Foam Milling

foam cutting specs.jpg

CNC Foam Endmill Router Bits Cutting Specs for Foam Milling

Polyurethane Foam, Polyethylene Foam, Extruded Polystyrene Foam (XPS), Expanded Polystyrene (EPS) and Ethylene Vinyl Acetate (EVA), insulation foam and similar types of foams are widely used for mould making, statues making, big 3d signs making.
A big size CNC router or a CNC robot with a big long foam mill bits can do these kinds of foam milling job. But how to choose the foam cutters? And how to set rpm specs?
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Usually, two kinds of foam mills widely used, ball end and flat end. Flat end foam router bits widely used for foam cutting, rough cutting, ball end foam router bits widely used for foam cutting, finish carving.
For fast milling, you can choose a big diameter shank and CEL foam bits.
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How to set the specifications?
The big foam bits RPM designed is 7000-10000RPM.
For EPS foam milling, we suggest setting the spindle RPM at 8000RPM. It is good for the machine cutters and can get a good surface finish.

For example, cut 80mm thickness polystyrene, we suggest twice cutting, one path cut 40mm thickness, running 8000rpm, feed rate at 150mm/Sec.
If you cut 80mm thickness once, run 8000rpm, feed rate should be within 70mm/Sec. Please try it.
specs for foam milling.jpg

Other information for reference:
I usually mill with these bits at about 7,000 rpm, and 70 inches per minute. It depends on the foam. I usually set the feed to 70 ipm, since that is the fastest I want to run the machine. Then do a test cut, and turn the rpm down until the foam cutting sounds good, (sort of a slicing sound). Too much rpm for the feed rate, and it melts the foam. Not good since it builds up on the bit, and makes a ball at the end of the bit.

My mill spends most of its time at lower RPM settings in foam, like around 8k. If you go much higher and don't increase your feed rates, you are probably burning and melting the foam as much as cutting it.

EPS is the common foam I use and I've run my 1" dia x 12" long 4 flute custom bit at 100% stepover at 6" deep, sometimes deeper. When you're manufacturing, cutting time is important. Hogging away as much material as you can with a large dia tool and then finishing with the smaller tool is the way to go.

I do a lot of foam cutting like this for my customer. I use 2flt high spiral carbide end mill with a high sher on them. I run them from 100 to 300 ipm at about 10,000 rpm.

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Recommend parameters for foam milling from RicoCNC:
The long bits for foam cutting, we usually recommend run at 6000-7000rpm. It is good for the machine cutters and can get a good surface finish.
Feeding speed at 5000-6000mm/min.

For bigger and longer bits, suggest start from 3000rpm, and adjust. The tool does not vibrate much and not make much noise is ok.
You can adjust it from slow speed.
These parameters just for reference, you can adjust as per your machine’s rigid, foam density, cutting depth, etc. Just test from a slow speed to avoid tool broken.

foam milling speed.jpg

RicoCNC supplies a range of durable router bits made specifically for milling EPS, EVA and polyurethane foam, including regular and tapered cutters in ball end and end mill styles. Ball Nose and Flat Bottom End Mill and tapered conical foam mill bits areavailable.

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