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7th July 2006, 03:24 PM #1Member
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Help an idiot fix an 'upside down' mitre joint
In this project, I have a very small margin for error. I didn't get any surplus wood, I don't have any money, and I have six days to finish it.
Given the above, I was very (very!) careful in deciding on dimensions. I got it just right, so that I wouldn't waste more than a couple of cm of wood.
I was incredibly careful to follow the measure twice, cut once (aka the measure at least 8 times so I don't screw it up) principal.
However, I still messed it up... I accidentally cut one board with the two mitres parallel (ie both 45 degrees, rather than one 45 and the other 135)!
So now I am in a pickle. I've been making cuts with a circular saw, and I don't trust myself to handsaw it straight, so the kerf of the blade is about 3mm. The side lengths of the mitre are 25mm, so I figure if I cut it off and flip it over the length of the board may be too short compared to the opposite side (which I already cut ). I have enough wood to make another mitred section, but I need to know how to fix it to the end of the board once I saw off the current botched part. I will be routing into the board, so I don't want to put any screws or nails into it. I'm unsure whether PVA wood glue will be strong enough to hold it together while I'm routing a groove into it...
What do you reckon? Thanks for the help
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7th July 2006 03:24 PM # ADSGoogle Adsense Advertisement
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7th July 2006, 03:54 PM #2
Bit hard to say without knowing more about what you are making. Is it a frame part or a carcase side? Can you reduce the overall size of the whatever it is and cut the opposite side down to suit?
"I don't practice what I preach because I'm not the kind of person I'm preaching to."
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7th July 2006, 04:00 PM #3Member
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I'm making a four sided rectangular box, with each of the four corners mitered. I can't change the side length to make it possible to just cut the correct angle into the board. It seems like my only option is to cut off the dodgey part and fix on a replacement, the right way around, but I'm not sure how the best way is to do this.
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7th July 2006, 04:12 PM #4
There are a few splice joints you could use. Is it possible to arrange it so that the dodgey part isn't seen? It will be hard to join to bits together end to end without it being obvious. A splice might be your best bet. Can you change the height?
"I don't practice what I preach because I'm not the kind of person I'm preaching to."
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7th July 2006, 04:13 PM #5
You may be able to glue the offcut back on, but the only glue I would use for this is expoxy.
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7th July 2006, 04:40 PM #6Member
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To clarify:
A is the birds eye view of the box, showing the miter joints that will join the sides.
B is what each side should look like.
C is what the side I cut wrong looks like.
D is my proposed solution; cut off the wrong part, glue on another one.
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7th July 2006, 04:42 PM #7Member
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Originally Posted by silentC
Thanks for the help so far silentC and echidna.
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7th July 2006, 05:09 PM #8
If you were prepared to make the box shorter, there is a way of fixing it using a scarf joint that is more or less invisible if the grain is not highly figured. You could retain the length and depth but the height would be slightly less. Let me know if you want to know how.
If you don't want to change any of the box dimensions (and don't want to pay for any more wood), then you'll need to glue a new bit on. I would use some kind of scarf joint or a splice. I don't think butt joining is going to be very successful. It will stand out. To splice it, just cut an opposing 45 deg mitre on a scrap bit and glue it on, then cut your new mitre."I don't practice what I preach because I'm not the kind of person I'm preaching to."
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7th July 2006, 05:19 PM #9
You could:
1)Make a feature of the corners with a vertical 'post' in different timber, and a 2mm detail line. Might look a bit fussy though.
2)Cut off the offending northern hemisphere mitre with the thinnest blade you have. BS? Drive over to Lignum's place, and have him domino the cut piece on again. He'd love it!
Commiserations my friend, we've all done it.The only way to get rid of a [Domino] temptation is to yield to it. Oscar Wilde
.....so go4it people!
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7th July 2006, 05:31 PM #10
Serendipity, I love. This is what I mean (thanks John):
http://www.woodworkforums.ubeaut.com...ad.php?t=34145The only way to get rid of a [Domino] temptation is to yield to it. Oscar Wilde
.....so go4it people!
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7th July 2006, 05:35 PM #11Member
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To confirm, does this diagram illustrate the process of using a scarf joint to fix it without changing the box dimensions silentC? If so, would you be using epoxy as echidna suggested, or do you reckon wood PVA will hold up ok?
Thanks for the suggestions TassieKiwi I'm in a real hurry though because I've gotta finish this asap for a present, so it looks like the above method is pretty much all stations go.
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7th July 2006, 05:48 PM #12Senior Member
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A scarf joint should be a much shallower angle than 45 degrees, but since it's a box and therefore won't be under to much stress you could probably get away with that. Definitely use epoxy however.
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7th July 2006, 05:49 PM #13
Yes, although a scarf joint is normally much longer, usually something like 8 times the thickness of the material. There's not a lot of long grain gluing surface there. If you use a good strong epoxy as Bob suggests, it should be OK. It's only a box and not subject to a lot of stress. I don't think I would trust PVA.
"I don't practice what I preach because I'm not the kind of person I'm preaching to."
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7th July 2006, 05:53 PM #14.
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Tassi got it. Although im a fair drive away, i would (if i was in this position) just but it and put four 5mm dominos and PVA then re miter. It would be super strong, and the slight end-end glue line will just go to the back where the hinge will be.
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7th July 2006, 06:03 PM #15GOLD MEMBER
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Would it be possible to add a feature eg different coloured wood in the centre if the offending piece? [It would basically turn each side you do this to into 3 pieces].
You would also have to add one to the parallel side or all sides if you choose. What I'm suggesting is either a rectangle/ diamond shape in the centre of the side[s] - this would be fiddly sure, but would move the ends out far enough to fix the problem.
Just a thought, hope you get it solved,
regards,
Bob
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