What's this Carbide coating.

[charlieuk]

I have been looking for the best router bits for shaping polystyrene for a long while however I still yet to find a good solution that is not crazy priced. The best I have found so far is these burrs from the USA at $40 each and which are supposedly carbide coated however it would be great if they were a bit longer.There is one but in the USA also I have found but runs in at $600 each !

I have been looking every were to try and find out ho they do the spiky carbide coating but with no luck so as to possibly look into having something custom made possibly how ever no idea of cost or if it is even posable.

as it is only for cutting foam would it be posable to have some made with the spikes just in steel and then heat treated? I have no real idea but just looking for options other wise it will have to be a long flute to do a ruff out and change for a final pass with a burr.

[EddyCurrent]

Any use ?

http://www.knighton-tools.co.uk/acat...ARY_BURRS.html

[charlieuk]

Unfortunately not I'm looking for exactly the same as my picture just with the cutting depth to be about 3 inches rather than 1.5

[IanS1]

This seems to be the manufacturer http://www.saburr-tooth.com/index.htm can't seem to find any info on longer shanks on their site though. Do you need the whole burr to be 3 inches or just the shank? If you're happy with a longer shank perhaps you can have an adapter made, to give the effect of a longer shank, to fit your spindle

[charlieuk]

Yes those are the ones I got, a longer shank would be a start but ideally the cutting edge wants to be longer . Many thanks

[Beone]

What you are looking for is called a rotary rasp.
Dave