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Author Topic: Drilling a mortise at an angle  (Read 2697 times)

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Offline rhmercier

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Drilling a mortise at an angle
« on: October 15, 2013, 09:41:52 PM »
I need to drill a stair banister into a log pole.  I don't know how to drill the mortise at the correct angel to accommodate a 2 1/8" diameter tendon.  Any suggestions?

Ron 

Offline Kevin

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Re: Drilling a mortise at an angle
« Reply #1 on: October 16, 2013, 08:19:58 AM »
A plunge router, bushing and template will work.
Double face tape the template to the log, drop the bushing into the template and router out the mortise.

Offline rhmercier

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Re: Drilling a mortise at an angle
« Reply #2 on: October 16, 2013, 10:56:37 AM »
Thanks Kevin,

This will be a 2 1/8" diameter about 1.5" to 2" deep hole.  Is the router motor strong enough for that size of hole?

Offline beenthere

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Re: Drilling a mortise at an angle
« Reply #3 on: October 16, 2013, 03:08:17 PM »
Quote
This will be a 2 1/8" diameter about 1.5" to 2" deep hole.  Is the router motor strong enough for that size of hole?

I was thinking Kevin meant to router out a small amount at a time... maybe your depth would be the biggest limitation for a router bit.
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Offline chet

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Re: Drilling a mortise at an angle
« Reply #4 on: October 16, 2013, 05:23:11 PM »
A good sized plunge router would do the trick. I have done mortises with mine to 5'' already. It has to be done in multiple steps, and blow out the chips each time.
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Offline m wood

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Re: Drilling a mortise at an angle
« Reply #5 on: October 16, 2013, 05:42:24 PM »
this probably sounds crazy, but when I'm drilling mortise's for stair banisters (log railing mind you) I get the angle grinder and nip away a shoulder until I can get the forstner bit to catch with the center bit.  Variable speed hole hawg and taker' slow.  Yes, I estimate and eye-ball that angle.  No matter how many guages and angle finders I've used on log railing...the best results have come from the good ol' eye-ball'in!  just my 2 cents.

I've had a bit or 2 (or more) walk out of that shoulder, but once you get the forstner to cut all the 360 degree, it'll go.
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Offline Kevin

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Re: Drilling a mortise at an angle
« Reply #6 on: October 17, 2013, 09:09:38 AM »
You can buy mortise chisels and clean out the drilled holes as well.

http://www.ptreeusa.com/edirect_100813.htm

Offline Axe Handle Hound

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Re: Drilling a mortise at an angle
« Reply #7 on: October 17, 2013, 11:54:36 AM »
If this is for an exterior staircase I would use an alternative method or make sure you drill your hole completely through the lower stringer.  Otherwise you're making a waterpocket that will rot your banister and stringer in no time. 

Another possible option for drilling those large diameter holes would be to build a solid wood jig that sits on your stringer and has a hole pre-drilled through it at the correct angle.  Clamp the jig to the stringer and the pre-drilled hole will guide your bit straight despite the center spur not being engaged at first. 


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