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Thread: Arbor Technique Query
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9th December 2019, 10:26 AM #1Intermediate Member
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Arbor Technique Query
Hi All
I am planning to make an arbor for my wedding. The arbor design I'm looking at is the one in the image below. The timber I'm planning to use are 150x150mm posts. I have not worked with such thick posts and was wondering how to make the connections circled in red in the image below. I'm thinking either steel plates and/or lag bolts.
Any suggestions welcome and thanks for the help.
arbor.JPG
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9th December 2019, 10:34 AM #2GOLD MEMBER
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the one thing you don't want to get wrong on your wedding planning.... because it'll end up with an early headache for you if it collapses !
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9th December 2019, 05:05 PM #3SENIOR MEMBER
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If it was mine, I'd be looking for steel plates with a couple of through bolts.
I'm sure a better wood worker than me could do a neat joint without plates. I'm also assuming it will need to be assembled in place then dismantled.
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9th December 2019, 05:28 PM #4
Why so thick? It is going to be very heavy and will have to be buried in the ground, is this intended to be a permanent fixture?
Rather than solid timber consider fabricating them as a box section from 19mm planks glued and nailed together. If it essential that they look solid then use mitered corner joints, you’d have to look very closely to tell. The legs can then be attached to either flat bases or long feet, rather than being buried. If you want to be really flash you could fill the bottom of the legs with sand for extra weight and stability.
But, if you want to use solid timber then I would use bridle joints with either bolts, screws or dowels to pin them together.Nothing succeeds like a budgie without a beak.
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10th December 2019, 07:47 AM #5Intermediate Member
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10th December 2019, 12:57 PM #6Senior Member
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Here is one I made for my son's wedding.
2.4m high x 3.0m wide x 1.2 deep.
Freestanding, 100mm square posts, designed to be disassembled & reassembled (3 pieces, 2 ends & 1 top)
arbour.jpg
arbour-end.jpg
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10th December 2019, 01:39 PM #7Intermediate Member
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Looks good graham. Any pointers?
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10th December 2019, 05:12 PM #8Senior Member
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I purposely kept away from angle joins. Gravity works better with a flat surface.
I checked & screwed the overhead bits into the top beams.
I mortise & tenoned the top & bottom rails on the side frames, then glued and clamped. The mitred bits are glued & screwed.
The posts are grooved on the inside face for the removable of the 4 x front & rear upper braces. Stop-blocks in the grooves also accurately locate the correct position of these braces.
The tops of the posts are slotted for the top frame to drop into, then through bolts holds it in place.
2 people can put up or take down in 5 minutes, with a battery driver & a spanner.
It now lives in their garden.
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11th December 2019, 07:31 PM #9
Based upon the original concept design, instead of using 150sq material, I would look to laminating each member from three layers of 140 x 45 or similar, with the joints created by overlapping the layers as required. i.e. the two outer layers of the uprights would be longer than that in the middle, and the the centre layer of the rafter would lock into the gap in the upright.the middle joint could be done in similar fashion. Members would be relatively light if done in pine, and the entire unit can be separated to 4 members for portability, then reassembled with two 8-10mm bolts and nuts at each joint. Minimal joinery skills and equipment required.
I used to be an engineer, I'm not an engineer any more, but on the really good days I can remember when I was.
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12th December 2019, 11:31 AM #10Intermediate Member
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