47. Know Your Joints: Frame miters
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- Опубликовано: 19 июл 2022
- Hey makers! Here are a couple frame miter reinforcement solutions I've made in the past:
Advanced Spline Jig: • Advanced Spline Jig //...
Spline Dowels: • Dowel Rod Splines // W...
Frame miter joints are one of the most common joints in the world of woodworking. It is the only joint that completely hides the end grain as the end grain on each corner butts up against each other. While typically used in picture frames, they’re also very common with trim moulding and even used to make boxes.
While these joints are very common, they can be much more difficult than they look. For example, getting perfect 90˚ angles can be difficult as each joint needs to have two cuts that are exactly 45 degree angles. Being slightly off by less than even a half of a degree means you’ll have gaps, either on the inside or outside of the joint. Because you’re hiding the end grains by butting them up against each other, it also means you’re gluing the weakest part of the stock. End grain to end grain is the worst way to glue boards together, especially due to wood expansion and contraction. Fortunately, there is a work around. Using splines and dovetail keys will add a different dimension of gluing to your joints that make them must stronger in the long run.
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Hey makers! Here are a couple frame miter reinforcement solutions I've made in the past:
Advanced Spline Jig: ruclips.net/video/pY1Ng3f2kag/видео.html
Spline Dowels: ruclips.net/video/rT8z3czO2t4/видео.html
FWIW, a PROPERLY glued end-grain joint is actually *far* stronger than a side-grain joint of the same surface area. I wish that myth that end-grain makes for a weaker joint would just die already!
I watched a vid the other day that tested the strength of all types of joints, the mitre came 2nd in a test of strongest joints, only beaten by a mitre with splines.
Ah yes, the bourbon moth one I presume?
@@adtymryd6295 yep that's the one
someone did a test where they compared the strength of end grain to a conventional joint and for equal surface areas its stronger, we see it as weaker because it usually has smaller surfaces
He has a video discussing this already.
Bourbon Moth did a whole video on the strength of joints... This was one of the strongest!
Bourbon Moth did a whole video on joints... The simple miter joint was one of the strongest joints! Adding a spline adds very little strength to it.
Woodworking 101: every joint has its purpose. If it doesn't work, you are using the wrong joint.
I just drill holes through em and run dowels for splines
The way frames are made for canvas is more interesting
Question: would dovetail joins made of epoxy resin be strong enough? I'm thinking of pouring resin into chiseled out bowties across the mitre, and am concerned they might not allow the wood around them to expand and contract with seasonal movement. Would i be ok to do this?
Good tip.
Please give more details my friend. They are so difficult
“End grain joint being the weakest spot.” This is absolutely false and you should definitely make some researches on this. Oh wait, others have done the researches for you. Just look up for joint comparison on RUclips.
I'm not so sure about the other videos. The ones I've seen test newly joined joints and it ones that have been subjected to expansion and contraction over a longer period.
Maybe it’s the hq speaker on my iPhone se 2016 but you sound a lot like the wood whisperer.
That you came up with while showing 1700s frames yeah you came up with that
End grain glue ups are actually very strong, do your homework.
You are incorrect! There are many joints that hide end grain. But, OK. Hint hint!
Sorry mare but end grain to end grain glue ups are one of the strongest joins. Please stop perpetuating this myth.
Wait dont they need to be 44.8
Exspecially isn't a word........
You are wrong. Splines and dove tails add next to no strength. A simple glued miter will hold over 150 lbs b4 breaking.
Your statement of how much weight the joint holds is meaningless. You need to mention where the load is applied, direction of the load, the dimensions of the joint, how the rest of the work piece is supported, the type of wood, etc, for "it holds 150 lbs" to make any sense.