How to secure loose knots prior to machining.

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Forum topic by dbhost posted 03-19-2014 02:27 PM 922 views 0 times favorited 6 replies Add to Favorites Watch
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5710 posts in 3227 days

03-19-2014 02:27 PM

I have some walnut I want to use for the mission dog kennel project that has been in my shop for a couple of years now. The problem I have is loose knots, and cracks / bark inclusions in the stock.

I was wondering, how could I secure that? I seem to remember a video from Marc Spagnulo on filling the voids with 2 part epoxy mixed with sawdust from the stock in question, and mind you. generating walnut sawdust won’t be a problem at all. Keeping it controlled IS…

So how would I go about doing this? Would any old epoxy work or do I need some special kind?

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6 replies so far

View woodshopmike's profile


226 posts in 1659 days

#1 posted 03-19-2014 02:44 PM

Hey Dave,

I usually use the 5 min loctite epoxy that you can pick up almost anywhere.

For gathering dust I use an oscillating spindle/belt sander with the vacuum off. I hold the wood to sand in my right hand while holding a piece of cardboard (some use a cup) in my left hand which acts as a wall to keep the dust from going everywhere. Once you get a little pile I put the dust in either a small jar or bag.

Also worth noting is to clean off the surface of your sander before you begin. This way you only collect the target species and not maple, cedar, walnut dust.


View DocSavage45's profile


8549 posts in 2838 days

#2 posted 03-19-2014 05:56 PM

Sounds right! Run a test on a small practice piece. Dust not coarse particles. I used coarse particles and it failed. One trial learning? Oh yeah and remembering.

I believe Marc is an LJ member. maybe a pm to him?

-- Cau Haus Designs, Thomas J. Tieffenbacher

View jdh122's profile


1008 posts in 2813 days

#3 posted 03-19-2014 06:22 PM

I’f you have any knots that are super loose you could pop them out and simply glue them back in with yellow glue. For the cracks, on the other hand, epoxy plus sawdust should work fine.

-- Jeremy, in the Acadian forests

View dbhost's profile


5710 posts in 3227 days

#4 posted 03-20-2014 01:01 AM

Too much gap on the loose knots for yellow glue. Would need something to fill the void. That is why I was thinking epoxy…

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View Roger's profile


20928 posts in 2800 days

#5 posted 03-22-2014 12:08 AM

Either epoxy and sawdust, or for walnut I’ve seen lead shavings from a pencil lead with epoxy does pretty good on Walnut. I would experiment on a piece of scrap first. That’s just me.

-- Roger from KY. Work/Play/Travel Safe. Keep your dust collector fed.

View TechTeacher04's profile


383 posts in 1527 days

#6 posted 03-22-2014 12:16 AM

You could also knock them out and use dutchman where needed. I like the look of them and they will add structural integrity. I prefer the looks of the bowtie pattern dutchman.

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