LumberJocks

My attempt at trefoils

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Project by TechTeacher04 posted 04-29-2017 10:42 PM 1213 views 0 times favorited 10 comments Add to Favorites Watch

This was my attempt at Banjoben’s trefoil. I assembled it with tape and had it right. Somehow between cutting the dovetail spines and gluing, I secrewed up the pattern. I still think it came out well. I had to cheat on the assembly and use screws hidden by plugs. The joints seem to be straight forward at first until you start rough assemply and realize that the miters are not all to the right or left, there is a mix and the order matters as my failed attempt shows. Maple construction with walnut splines, overall i am pleased with the result. First attempt at dovetailed splines. I still need to finish sand and apply finish, it will likely be satin wipe on poly.





10 comments so far

View BanjoBen's profile

BanjoBen

106 posts in 1959 days


#1 posted 04-29-2017 11:24 PM

Looks as though two of the layers got transposed in the construction, resulting in an unknot, rather than a trefoil knot. Still, really cool! Maple and walnut is one of my favorite combinations.

View SteveMI's profile

SteveMI

1167 posts in 4353 days


#2 posted 04-29-2017 11:28 PM

I have a complete first attempt done to see if I could actually cut that many miters to line up and it worked. No routing or splines, just to see if I could do it.

Two more are in the process with edges routed this time. For me the glue up is the hardest part, I’ve glued up three main parts and now the weight of each makes getting them to align a challenge.

Are your screws under the spines?

Steve.

View BanjoBen's profile

BanjoBen

106 posts in 1959 days


#3 posted 04-29-2017 11:32 PM

Yeah, the glue up can be tricky. I’ve done them in stages: glue up pairs, let them set, then glue up pairs of those, until in the end I have two pieces that have to be joined up. It takes some time but it keeps things from moving around.

View TechTeacher04's profile

TechTeacher04

459 posts in 2590 days


#4 posted 04-30-2017 12:20 AM

I precut the splines before gluing. I used the splines to help hold the joint in alignment when gluing. I drilled and countersunk the screws after a few of my glue joints failed due to my inability to clamp it.

View ChuckV's profile

ChuckV

3370 posts in 4586 days


#5 posted 04-30-2017 12:56 AM

I like the way that it looks anyway – the dovetailed splines are great.

When I made mine, I was pretty obsessive about keeping the pieces marked so that I would not screw up. Still, at one point in the gluing process, I was sure that I had made a mistake. Once I looked more carefully, I was relieved to find that it was correct.

Steve - I found that the splines really helped get things together correctly during the glue-up. Also, this Elmer’s glue has a quick initial tack. I just used hand pressure to hold the pieces together for about 30 seconds. I always waited overnight before doing the next phase of gluing.

-- "Join the chorus if you can. It'll make of you an honest man." - I. Anderson

View Jim Jakosh's profile

Jim Jakosh

26095 posts in 4164 days


#6 posted 04-30-2017 02:33 AM

Really cool. Nice and strong with splined corners!!

Jim

-- Jim Jakosh.....Practical Wood Products...........Learn something new every day!! Variety is the Spice of Life!!

View torus's profile

torus

534 posts in 1472 days


#7 posted 04-30-2017 03:21 AM


Looks as though two of the layers got transposed in the construction, resulting in an unknot, rather than a trefoil knot. Still, really cool! Maple and walnut is one of my favorite combinations.

- BanjoBen


Ben, can you explain in layman terms difference between knot and unknot?
Oh, wait, I think I can see it now. The unknot can be unfold in a loop and the knot cannot be, right?

-- "It's getting better..." - put this on my RIP stone!

View unclearthur's profile

unclearthur

383 posts in 2847 days


#8 posted 04-30-2017 07:12 AM

Been working on one of these myself, was gluing up one of the last joints, a little slip, a little twist and SNAP one of the joints failed. Then I realized I had the grain going in the wrong direction on all my splines. Will finish it, but it will be very fragile.

Still a fun project though, good practice.

View BanjoBen's profile

BanjoBen

106 posts in 1959 days


#9 posted 04-30-2017 06:41 PM

That’s right. If you imagine a flexible version, the unknot can be untwisted to a simple loop with no crossings, without breaking the loop. The trefoil can’t be undone without breaking the loop.


Ben, can you explain in layman terms difference between knot and unknot?
Oh, wait, I think I can see it now. The unknot can be unfold in a loop and the knot cannot be, right?

- torus


View helluvawreck's profile

helluvawreck

32122 posts in 3925 days


#10 posted 04-30-2017 09:15 PM

Nice work!

helluvawreck aka Charles
http://woodworkingexpo.wordpress.com

-- helluvawreck aka Charles, http://woodworkingexpo.wordpress.com

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