Compound Miter Problem
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I have been trying to create a new design for a piece of furniture. No matter what i do, my parts do not join at the compound miters properly. I seem to always have a approx 1/32" gap.
I have change all the accuracy settings and this has not helped. I have attached the file if anyone wishes to take a look. The box is created by taking "boards" and putting in a 14.511 deg crosscut and beveling this line at 43.08 deg.
Any suggestions? Is this a round off error bug?
Thanks,
Chris
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Do the bevel need to be at 45deg?
To do it another way you could just make it all square, ignore the bevels. Then just scale the bottom lines uniformly inward to get what you want.
Chris
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Well that most definately did it. The issue must be in the tolerances. The compound miter joint calculator that I used is right on as far as the geometry is concerned. I think SU has some issues with small angle tolerances.
Thanks!
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Dear g2ktcf,
Yes, SU can be a bit quirky.
I sometimes have a problem with the offset tool too.
Suppose I have a circle of radius 5 mm and I want to offset 0.5 mm inward. If I query the radius of the new circle using Entity Info it tells me that it is 4.496 mm. If I edit the dimension and hit return, it bounces back to 4.496 again. If I enter a largish offset by altering the radius to 3 mm say, and then change the radius back to 4.5 it works.
I think that SU has a problem with small changes in dimensions as well as small dimensions. The way to get around this is to scale up by x100, make the changes and then scale back.
Kind regards,
Bob -
How is your compound miter saw for those small angle tolerances? Could be your calculator rounded off significant decimals that SU needed, also. Compound miter saws make compound miter cuts overly complex. The "ancients" new that if they tilted the workpiece at the needed angle they could cut the piece using the percieved miter angle setting and would get perfect fits. Tilting the work against the fence, one would cut the normal 45 miter angle as if it were flat work.
Here is a tutorial more along the way I would do it in actually making the pieces from wood. I would not use a compound miter saw, but do it the old fashioned way, tilting the pieces against the fence in the manner of their eventual orientation and make a 45 degree miter cut. This automatically gives you the required bevel angle as well as the actual miter relative to the board.
http://www.sawdustersplace.com/Storage/CompoundBox.skp
Tilting the piece in the skp then turning the cutting plane to the 45 degree angle represents the actual method on the saw.
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oh, I never intended to build this with a compound miter saw...they are not really good for this sort of fine work. I fully intend to build a special crosscut sled for my table saw for this. The wood will be high end stuff and I want zero chances of making a mistake! I am thinking about building a cheap version from cheaper materials first and selling it just to get the experience.
The reasons for getting it right in SU first was to check out how different woods and accents would look like.
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