best join for a triangle - Woodworking Talk - Woodworkers Forum
 
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post #1 of 12 Old 09-14-2020, 09:06 PM Thread Starter
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best join for a triangle

Hi all, beginner here attempting a kids climbing frame project.

I'm making a triangle similar to the one shown here: https://i.ebayimg.com/images/g/wXoAA...JFJ/s-l180.jpg

What is the best way to join the three pieces of timber together? I was thinking a half-lap, but wondering if I could just glue/bolt them together, no tools required. Or another alternative?
It'll need to be stable as it will have a toddler climbing/swinging/whatever on it.

Thanks!
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post #2 of 12 Old 09-15-2020, 09:46 AM
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Language has me stopped on this one. Are you discussing using timber as opposed to dimensional lumber as shown in the photograph?




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post #3 of 12 Old 09-15-2020, 09:55 AM
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George - the term "timber" is commonly used in some countries for basic boards or dimensionally cut wood.
it took me a while to figure it out too.

Tory - what tools do you have on hand ?
as for joining the triangle together, I would use biscuits or splines.
dowels will work well for two of the corners, but the 3rd corner needs a little more wiggle room during assembly.
an option would be to get a good grade of plywood and cut the triangle out with a jigsaw. round over the edges, sand, prime and paint. then install the dowels.

best join for a triangle-s-l180.jpg

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Last edited by John Smith_inFL; 09-15-2020 at 10:04 AM.
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post #4 of 12 Old 09-15-2020, 11:39 PM Thread Starter
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Sorry for the confusion!
I've got 90 x 35mm pine (1.5m for each side of the triangle).

No power tools except a drill, but could get access to some if needed.

@John Smith_inFL: Can you explain what you mean about wiggle room?
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post #5 of 12 Old 09-16-2020, 07:53 AM
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Tory - thanks for coming back.
wiggle room, in our sense, is to leave a little room in a joint that is not so tight
that it is hard to fit it together like it should go. to leave room for adjustments.

looking at this design, and understanding your skill level and tools available,
I think that this project would be best if left for someone to build it for you.
due to safety concerns for the child, this item could result in injury (or worse)
if something should go wrong with the construction methods.
it looks like a really fun toy for small kids. but I think someone with more skill
and the proper tools should build it for you.
perhaps you could find something else that is a little less complicated to build.
wishing you all the best - and stay safe down there !!

John

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post #6 of 12 Old 09-16-2020, 08:51 AM
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if you decide to get help with this project, this is how the boards
would be cut and some of the tools required.
read, understand and follow all safety directions with everything you use.

best join for a triangle-20200906_201850.jpg

best join for a triangle-61k2syozusl._ac_sl1500_.jpg

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post #7 of 12 Old 09-16-2020, 09:31 AM
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Dowels would be the strongest, but you need to get the correct angles to match on each end. Best to have a good protractor handy and a method of finding the correct angle to drill down or none of the dowels will match up.
Splines will work and likely the easiest to implement..
Of course you could just drill from outside to outside corners and insert screws. Even long screws will work and if the pointed end sticks out just grind the tips off.

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Last edited by allpurpose; 09-16-2020 at 09:33 AM.
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post #8 of 12 Old 09-16-2020, 06:59 PM
where's my table saw?
 
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Just use plywood!

Two pieces of plywood glued together with grain running at right angles with the center triangles cut out would be the easiest and strongest. Both pieces of one end would fit and a 4 X 8 ft sheet depending on how large OR all 4 may fit if they are small enough.... I donno?

No tricky joinery required! I said tricky and I meant tricky! To half lap those angles would indeed be tricky to say the least, BUT it would be the strongest type of joint.



The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)

Last edited by woodnthings; 09-16-2020 at 07:16 PM.
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post #9 of 12 Old 09-17-2020, 05:48 AM
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If you can access to a table saw with a Dado blade, a half lap joint would be my first choice.
I would drill the holes leaving about 3.5mm in thickness left. That would give sufficient gluing surface for the rungs/dowels.
Another alternative would be to counter sink the screws and screw the rungs from the outside and then fill in the countersunk holes. Glue would also be necessary as far as I am concerned.

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post #10 of 12 Old 09-17-2020, 05:58 PM
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I'll up the ante a bit- even better than a half lap would be a bridle joint.
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post #11 of 12 Old 09-18-2020, 01:23 AM Thread Starter
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Thanks for the responses.
I assure you no kids will be put on anything I'm not sure is safe.
Looking forward to giving it a go!
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post #12 of 12 Old 09-18-2020, 06:36 AM
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Have fun and take some photos to post on here

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