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post #1 of 18 Old 10-20-2015, 09:12 PM Thread Starter
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Joinery Question

What type is used for the shade - butt joint?
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post #2 of 18 Old 10-20-2015, 09:15 PM
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Assuming the shade is square, both pieces had a 45 degree bevel cut on the sides. Then they were glued together.
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post #3 of 18 Old 10-20-2015, 10:47 PM
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+1. That looks like a 45 beveled joint. Many will also call it a mitered joint.
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post #4 of 18 Old 10-21-2015, 09:45 AM
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Looks like it isn't a cube but has a taper going back. If you're trying to replicate this, that isn't the easiest of miters
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post #5 of 18 Old 10-21-2015, 12:31 PM Thread Starter
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Quote:
Originally Posted by Parabola View Post
Looks like it isn't a cube but has a taper going back. If you're trying to replicate this, that isn't the easiest of miters
It looks tapered to me to. I think I will skip the mitered joint.
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post #6 of 18 Old 10-22-2015, 12:28 PM
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I guess a wood shade may work with a non-heat producing bulb, like led? I don't know. but it would be a half degree or so off of 45 deg because of the taper.
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post #7 of 18 Old 10-27-2015, 05:53 PM
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Couldn't you just use a tapering jig on the table saw, and set the blade to 45?

Cut one side, then flip the workpiece and cut the other. That should do it?
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post #8 of 18 Old 10-27-2015, 07:43 PM
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Quote:
Originally Posted by sanchez View Post
Couldn't you just use a tapering jig on the table saw, and set the blade to 45?

Cut one side, then flip the workpiece and cut the other. That should do it?
Don't know if this makes sense, as my Dad used to say, "I don't always understand all I know about it."

It is not that simple, the corner is at 90 degrees when a square is held at 90 degrees to the miter, but the ends are not 90 degrees, so if the square is held parallel to the end the compound angle is no longer 90 degrees. So adjustments have to be made. Try it on a waste paper basket or flower pot to see how it works.

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post #9 of 18 Old 10-28-2015, 08:56 AM
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it's called a compound angle. this site helps understand.

http://www.pdxtex.com/canoe/compound.htm
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post #10 of 18 Old 11-16-2015, 11:14 AM
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Quote:
Originally Posted by TrevortdogR View Post
What type is used for the shade - butt joint?
I was able to zoom in and clear your picture and saw that it was done using rabbet joints on two sides then join the other two pieces into it. Also i have seen similar shades using multiple different kinds of finger joints which would look cool too! Looks like a fun a cool project! Goodluck!
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post #11 of 18 Old 11-16-2015, 01:10 PM
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Quote:
Originally Posted by TimPa View Post
I guess a wood shade may work with a non-heat producing bulb, like led? I don't know. but it would be a half degree or so off of 45 deg because of the taper.
Be careful of heat producing bulbs in an wood environment.

George
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post #12 of 18 Old 11-17-2015, 12:00 AM
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yep, looks to be a 45, but somebody zoomed in and said it was rabetted. If it was mitered, the taper does not change that, its just tapered thats all. Yeah, the guy who said it would be done witha taper jig was right.
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post #13 of 18 Old 11-17-2015, 12:06 AM
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Quote:
Originally Posted by whitewolf8758
I was able to zoom in and clear your picture and saw that it was done using rabbet joints on two sides then join the other two pieces into it. Also i have seen similar shades using multiple different kinds of finger joints which would look cool too! Looks like a fun a cool project! Goodluck!
It is a low resolution photo so it is hard to tell, but I'm pretty sure it is not a rabbet joint.

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post #14 of 18 Old 11-17-2015, 02:40 AM
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Do you suppose its rabbeted or a butt joint and a type of vaneer put on each side?
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post #15 of 18 Old 11-17-2015, 02:50 AM
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I entered solid wood table lamp in google and went to images and found several of these and a couple of them close up show the shade is put together with a butt joint then used a vaneer. There are varieties of this style there. I may have to try and buikd one of these myself!
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post #16 of 18 Old 11-17-2015, 07:31 AM
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this video will show you how ...

It's a compound miter, a miter and bevel combined.

There is a chart that will give you the correct angles .... the miter angle and the bevel angle, depending on the number of sides to the object:
https://www.youtube.com/watch?v=_CRJsn_pQ7Q

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; 11-17-2015 at 07:57 AM.
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post #17 of 18 Old 11-17-2015, 11:43 AM
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How the original was made is really immaterial, it comes down to the method you use to duplicate the effect.
Believe some of us that say it can't be done with 45 degree miters, all the speculating in the world won't change that.
Take some cheap plywood and play around with dimensions and angles from the information you have been provided with, you will come up with the formula, then build your shades.

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post #18 of 18 Old 11-19-2015, 05:04 PM
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the shade can be made using a birdmouth joint. google the joint and you can find manufacturers of the bits that can be use to make 6 and 12 piece joints to make hollow tubes. However, if you are accurate enough with your table saw settings... the joints can be made on a table saw. The tricky part is cutting pieces at the correct taper. there is a jig for that too.

One of the sites has instructions on how to determine the angle of the saw for the joint...and the angle of the taper to make just about any number of sides you want.

The birdmouth joint was used to make hollow spars on sailing ships. Makes sense as solid ones would have made them top heavy and rather devastating in a storm.

hope this helps.
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