Need advice on CNC router bits

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Forum topic by downrightcreative posted 01-14-2018 12:40 PM 943 views 0 times favorited 10 replies Add to Favorites Watch
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5 posts in 586 days

01-14-2018 12:40 PM

Topic tags/keywords: cnc bits router bits freud bits advice help carbide tip

I have a home made CNC which has my Dewalt router attached to it. I can use 1/4” or 1/2” shanks.

I make the same things, over and over and over, so my bits get a lot of repetitive use. I use two types of bits-

1- I use Freud 3/32” round nose bit for 90% of my work. Mostly straight line, 2 pass, shallow carving. Been using these for 3 years and the last year I’ve been getting a ton of burrs or tear out, but I can’t figure out why.

2- I use Freud 1/4” diameter up spiral bit for my cut through work. Due to my homemade table setup, I really need something with a longer post (I guess that’s what you would call it.) I’d love to get a smaller diameter also.

I’m not opposed to spending some real money to get a bit that lasts. What do you reccomend?


10 replies so far

View Desert_Woodworker's profile


1855 posts in 1668 days

#1 posted 01-14-2018 01:31 PM

View downrightcreative's profile


5 posts in 586 days

#2 posted 01-15-2018 04:57 AM

Desert_woodworker, do you have experience with a certain brand and style from that site?

View CaptainKlutz's profile


1640 posts in 1948 days

#3 posted 01-15-2018 06:42 AM

Bits need to be clean and sharp. Check your edges, use a find diamond hone on flat side of carbide to re-sharpen them periodically might help.

There are a lot of sources for CNC router bits. Depends heavily on application and wood being cut.
In the link above – Amana has many product lines targeted towards the smaller table top CNC machines commonly sold for wood working. Amana even has a 1/2 shaft bit with replaceable inserts for different cutting shapes. You can also call Holbren for help selecting Amama CNC bits for you application.

One source for CNC tools I use is MSC direct. You can find everything from cheap as dirt one time use HSS straight cut to exotic full carbide up/down spiral cut bits. You can get generic 1/4” full carbide double helix spiral (up/down cut) bits for less than half cost of regular router bits found from normal woodworking sources.

Best Luck.

-- I'm an engineer not a woodworker, but I can randomly find useful tools and furniture inside a pile of lumber!

View bredro's profile


7 posts in 586 days

#4 posted 01-15-2018 10:58 AM

I actually work on a cnc machine
we use Belin router bits..very good quality bits…we buy them direct through Multicam.
Or Acme in Toronto…I`m in Canada so not sure what the American equivalent would be:)


View Mike_D_S's profile


595 posts in 2668 days

#5 posted 01-15-2018 04:53 PM

I use a lot of Amana bits. While they’re not available in really small sizes, I really like the Amana bits with the replaceable blade. It makes honing them easy as you can remove the blade from the bit and you can replace just the blade if they get really dull.

One thing to watch out for is the chip load as specified by the bit maker. Since your Dewalt router is basically fixed rpm, you should make sure your feed velocity is matched for proper chip load. This will help with bit life in the long term.


-- No honey, that's not new, I've had that forever......

View bonesbr549's profile


1583 posts in 3521 days

#6 posted 01-15-2018 05:24 PM

I use Amana Bits, and really like them. I started with them and have had real good luck. I’ve not bought sets, and slowly got a good stable of bits, and even bought a flycutter for flattening my 4×8 table. I have a cnc routerparts table i built from a kit. Love it.

-- Sooner or later Liberals run out of other people's money.

View downrightcreative's profile


5 posts in 586 days

#7 posted 01-16-2018 03:59 AM

Thank you so much CaptainKlutz, bredro, MikeDS, and bonesbr549! I really like the sound of that Amana with replaceable blades. Usually stuff like that is crap, but if you guys have had good luck, I’m willing to give it a go! Off to do so shopping and comparing!

View oldnovice's profile


7496 posts in 3821 days

#8 posted 02-06-2018 08:18 AM

I love Amana bits but there are others that are just as good or better!
Onsrud, very good and a lot of information on their site!
Niagara, I have used there without an issue.
Kodiak, I like these too.

There are probably other ones I have not tried as yet.
My son is a CNC machinist and he gets me more info than I can assimilate about cutters.

-- "I never met a board I didn't like!"

View Holbren's profile


23 posts in 1458 days

#9 posted 02-08-2018 10:20 PM

Whiteside SC40, very popular bit for the round nose

View oldnovice's profile


7496 posts in 3821 days

#10 posted 02-09-2018 04:13 AM

Thanks Holbren, I forgot Whiteside and I even have two of their bits!

-- "I never met a board I didn't like!"

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