Where to buy router bits

[HomerSimpson]

I just finished my cnc router build and was talking to one of the experienced model makers in our model shop at work about what end mills to purchase. He said that:

1) to work with wood, you need a much steeper angle on the cutting edge. For steel this might be <15deg or so, for plastic <30 but for wood it wants to be 40-50deg.
2) he said that if you use the shallower angle bits, at the speeds that routers operate at (8000 to 25000 rpm), then they will build up with the resins in the wood, sticking to the bit, and at these high speeds will heat up and anneal the steel, which causes it to get soft, and therefore dull very quickly.

Need to buy bits designed for wood but I'm struggling to find a good source for bits/end mills. Anyone have more suggestions?

[ger21]

There are several threads from the last few months that listed many suppliers. Unfortunately, I couldn't find any with a quick look.

then they will build up with the resins in the wood, sticking to the bit, and at these high speeds will heat up and anneal the steel

You really only want to use carbide bits with wood, as steel dulls very quickly. Also, resin buildup is only a problem when cutting softwoods like pine, or some plywoods. The key to keeping heat down is to run at the proper feedrate for the rpm you're using.

Here's a few suppliers.

www.eagleamerica.com
www.vortextool.com
www.onsrud.com
http://www.discount-tools.com/endmills/3915.cfm
http://www.centuriontools.com/
http://www.american-carbide.com/Woodworking/RB.php

[Mike 1948]

I use these, they are not the cheapest but hold up very well.

http://www.beckwithdecor.com/index_files/Cutters.htm

FYI for finish 3D cuts I "normally" run a 1/8 dia ball @ 20,000 rpm with .010-.015 stepover. Feed at about 100 IPM, depth around .75 max. Many times I don't need to use a roughing cut. Saves alot of machine time.

Have Fun
Mike

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