Router Bit Confusion - radius, cut length, depth etc. Fluting Bit

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Forum topic by PatrickIrish posted 04-28-2018 10:45 PM 1855 views 0 times favorited 4 replies Add to Favorites Watch
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153 posts in 2655 days

04-28-2018 10:45 PM

I bought the Woodline wl-1475 fluting bit with top and bottom bearings directly from Woodline. It’s the exact bit Scott Lewis used to make that trick sweeping inlay cutting board. He used it for the handles.

That said, they list the bit as a 3/8” radius and 3/4” cut length.

I assumed and have a feeling I was wrong, that 3/8” radius meant the height of the slot it made. Figured that would be a perfect size for finger handles on a cutting board that’s 1 1/8” thick.

Link to website of bit

CMT has some bits similar it looks like but nothing in 1/2” shank that has a 3/8” or 5/16” overall height of the slot.

What is considered the depth of the cut of the bit? From the bearing to tip of the bit?

4 replies so far

View Rich's profile


5153 posts in 1199 days

#1 posted 04-29-2018 01:43 AM

Not having the bit in hand with my calipers, it appears that the 3/8” radius would mean that the bit will cut a flute that is 3/8” of an inch deep, assuming the wood rides against the bearings, and 3/4” wide at the opening.

-- Half of what we read or hear about finishing is right. We just don’t know which half! — Bob Flexner

View bilyo's profile


962 posts in 1712 days

#2 posted 04-29-2018 01:49 AM

I’m sure someone will correct me if I’m wrong. As you have it pictured: the radius is the horizontal distance from the center line of the shank to the outer tip of the cutter. The height of cut is vertical distance from the bottom of the cutter to the top (just above the bottom bearing and just below the top bearing. The depth of cut is, as you said, the horizontal distance from the bearings to the outer tip of the cutter. I think that is the way it works, but I can see that it appears inconsistent with the picture.

View OSU55's profile


2510 posts in 2599 days

#3 posted 04-29-2018 12:04 PM

That bit will make a 1/2 circle slot 3/4” tall and 3/8” deep. Its two 3/8”radii stacked making it 3/4” tall. The same style with a 1/4” radius would make a 1/2” tall slot and 1/4” deep.

View jerryminer's profile


960 posts in 2051 days

#4 posted 05-01-2018 06:06 AM

-- Jerry, making sawdust professionally since 1976

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