2 flute straight bit into endgrain

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Forum topic by ScottKaye posted 04-13-2017 03:40 PM 736 views 0 times favorited 9 replies Add to Favorites Watch
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783 posts in 2759 days

04-13-2017 03:40 PM

I’m looking into using a 1/2” – 2 flute straight bit to cut the mortises for the bed rail hardware I’m installing into the rails and posts of the bed I’m building for a friend. My question is what kind of a cut will I get using the 2 flute straight bit into the end grain of the rails (soft maple)? I suspect its a bad idea and will lead to wild tear out. (though I could be wrong!) Id rather not have to go out and buy a spiral down cut bit but is that really my only choice to get ‘crisp’ edges around the mortise?



-- "Nothing happens until you build it"

9 replies so far

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#1 posted 04-13-2017 03:43 PM

Not sure. Do you have some scrap that you can make a few test cuts on?

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#2 posted 04-13-2017 03:49 PM

You might consider cutting a saw kerf or scoring a knife wall around the mortise shoulder prior to doing the routing. That might be sufficient to leave a clean edge at the shoulders.

-- Kenny, SW VA, Go Hokies!!!

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783 posts in 2759 days

#3 posted 04-13-2017 03:49 PM

I left the rails long so I could practice cutting the mortises. I’m cutting them by hand (so to speak) with a 2 1/4 hp Bosch EVS23 plunge router and the Bosch micro adjustable fence so I suppose I get to test the bit too :)

Scott.. Ill let everyone know how it turned out

-- "Nothing happens until you build it"

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#4 posted 04-13-2017 03:51 PM

+1 @ Kenny. Good idea

-- "Nothing happens until you build it"

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#5 posted 04-13-2017 07:20 PM

You could try using a drill to remove much of the waste, then use the router to clean up.

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

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#6 posted 04-13-2017 08:33 PM

Hey, Scott, I have a Whiteside RU 5200 if you want to borrow it.

-- Art

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#7 posted 04-14-2017 01:26 AM

I use mill ends on my Horizontal mortiser without any problems, just go in slow!

-- Lifting one end of the plank.

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3107 posts in 2831 days

#8 posted 04-14-2017 01:45 AM

I would think the spiral bit would work better, but I’d choose an up spiral. The down spiral will pack chips into the bottom of the mortise and bog it down. Unless you are planning on a through mortise?

-- I admit to being an adrenaline junky; fortunately, I'm very easily frightened

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71 posts in 1964 days

#9 posted 04-14-2017 04:12 AM

I have done a few, I had to hog out the bulk with the ½” straight bit, come behind with the MUCH cheaper ¼” DOWN SPIRAL bit. Why a down spiral? It tends to minimize surface blowout (a common and aggravating occurrence with maple) and leaves a decent looking ⅛” radius corner. Or a chisel and a hammer works pretty good if you need squared corners.

-- I don't think I'm ever more "aware" than I am right after I hit my thumb with a hammer. Questions about solid surface? Just ask.

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