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How to clamp a triangular brace?

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Forum topic by manuka posted 02-07-2015 06:16 PM 1578 views 0 times favorited 12 replies Add to Favorites Watch
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manuka

30 posts in 787 days


02-07-2015 06:16 PM

Topic tags/keywords: clamping hardwood triangle

I nearly lost it trying to glue up these braces late last night. Clamps slipped, screws broke… When I started to want to throw things at the floor, I had to stop.

On the picture the two boards are just standing there, nothing is yet attached. It’s a dense timber so it will walk away from screws unless clamped.

How would you attach these braces?

With the coolness of morning, here are some ideas that came to me. Would appreciate comments on those too as at this stage.
- Forget about the triangles. Use rectangles for these braces. (Not loving this idea for looks.)
- Cut the triangles at a different angles so there is a clamping surface at the top.
- Order some shelf clamps. Those look like they would do the job, does anyone have experience with them? I don’t own them so I’d have to order and wait a week (not a big issue if this is the best way.)
- What else?

Thanks in advance for any thoughts and insights!


12 replies so far

View Fred Hargis's profile

Fred Hargis

3949 posts in 1960 days


#1 posted 02-07-2015 06:23 PM

Cut a notch in each triangle. Use that for your clamps. The notch would have a side parallel with the front and bottom of the triangle.

-- Our village hasn't lost it's idiot, he was elected to congress.

View Dan658's profile

Dan658

93 posts in 736 days


#2 posted 02-07-2015 06:30 PM

I would glue and clamp the two boards together first, and then after the minimum clamping time, I’d place the triangle braces in with 2 part epoxy.

View TheFridge's profile

TheFridge

5765 posts in 952 days


#3 posted 02-07-2015 07:20 PM

Yup. Cut a small triangle in you triangle so the clamps sit good

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

View dhazelton's profile

dhazelton

2326 posts in 1763 days


#4 posted 02-07-2015 07:28 PM

Countersink screws in from the side and bottom.

View firefighterontheside's profile

firefighterontheside

13518 posts in 1323 days


#5 posted 02-07-2015 07:36 PM

Glue and screw two perpendicular pieces together, then predrill thru corner blocks with a drill bit appropriate for the size of the screw, then move corner piece away and drill larger hole so that the threads of the screw don’t engage the hole. That will allow the screws to pull the two pieces tight together without breaking screws.

-- Bill M. "People change, walnut doesn't" by Gene.

View Ghidrah's profile

Ghidrah

667 posts in 688 days


#6 posted 02-07-2015 07:48 PM

It looks like if you had a couple 4, 5 or 6” deep C or bar clamps you could glue the right angle together 1st then cut a couple blocks long enough to cut a 90° notch in them deep enough to retain/restrain both sides of the jig in place opposite the braces. Glue, place and clamp the braces to the restraining V notched blocks and wait.

-- I meant to do that!

View mcg1990's profile

mcg1990

159 posts in 759 days


#7 posted 02-07-2015 08:03 PM

Brown is what you’ve got, red is a cut block, green are clamps.

No?

View daddywoofdawg's profile

daddywoofdawg

1010 posts in 1041 days


#8 posted 02-07-2015 08:15 PM

drill vertical holes in the “braces” maybe 2,then 1-2 horizontal to screw into the bottom of the shelf. glue and screw your braces where you want them then come back and do the same to the shelf.

View Mykos's profile

Mykos

102 posts in 1261 days


#9 posted 02-07-2015 09:15 PM

I’d be inclined to do what mcg1990 described but even simpler, by using the other part of the triangle brace cutoffs. A loose triangle cut with the complimentary angle will let you put clamps on in both directions.

View SCOTSMAN's profile

SCOTSMAN

5839 posts in 3051 days


#10 posted 02-07-2015 09:24 PM

Why couldn’t you just put a few dabs of hot melt glue onto it and hold for a few seconds till dry then screw away?Once it is screwed up you could if unhappy take it apart and remove-scrape away the H M glue then it should be easy to screw together but I would leave it alone or superglue even.You will only require a few drops of HMG or superglue wait till it’s nice and runny hot then as sai alittle will do you don’t want it seepeing out of the joint all onto your nice clean unburned fingers.Alistair

-- excuse my typing as I have a form of parkinsons disease

View manuka's profile

manuka

30 posts in 787 days


#11 posted 02-09-2015 02:46 AM

Wow, guys, many thanks for all the helpful replies!

Even if the method I followed wasn’t the one you posted, I learned from each suggestion. This will be a really useful thread for anyone else looking to clamp triangles.

After cutting one corner as some of you suggested and clamping the first side, I kept the sides square while clamping the second side by balacing clamps from two directions (photo).

View patron's profile

patron

13538 posts in 2807 days


#12 posted 02-09-2015 03:00 AM

rather than all that
a pice of scrap stock say 1×2 cut just short of the hypotenuse side
with 45* notches in it both ends
to clamp to
just have different lengths stored in a box
for future works

-- david - only thru kindness can this world be whole . If we don't succeed we run the risk of failure. Dan Quayle

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