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post #1 of 6 (permalink) Old 07-28-2012, 08:51 AM Thread Starter
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Default Angle s

I am struggling with the cutting of angles.. I am attempting to make a serving tray. this will entail a miter of 22.5 not problem with that on my miter saw...but i also must cut a bevel of 40 degrees ..the problem with this is when i use my digital angle setter it will not show the 40 ...can it be i should be setting at 50 degrees and what is left is 40 degrees???
my scale on my miter saw has 45 degrees plus but again all my tools indicate its a 50 degree cut not very quick about geometry and i think i need a puch ...thank you
Bill
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post #2 of 6 (permalink) Old 07-28-2012, 10:22 AM
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Hi Bill

Easy job with a RAS or if you have mate that has one so you can use his/hers if not you will need to make a jig for a compound angle cut..

Jig=Something like the jig below to cut a true 60 deg.angle.
The jig is to a make a Flag box with no end grain showing.

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Originally Posted by wuzfuzde View Post
I am struggling with the cutting of angles.. I am attempting to make a serving tray. this will entail a miter of 22.5 not problem with that on my miter saw...but i also must cut a bevel of 40 degrees ..the problem with this is when i use my digital angle setter it will not show the 40 ...can it be i should be setting at 50 degrees and what is left is 40 degrees???
my scale on my miter saw has 45 degrees plus but again all my tools indicate its a 50 degree cut not very quick about geometry and i think i need a puch ...thank you
Bill


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post #3 of 6 (permalink) Old 07-28-2012, 10:44 AM
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Bobj3; There have been recent discussions here about the precision of angle cuts. One commenter even stated that draughting set squares couldn't be trusted.
Obviously your jig makes a lot of sense for setting the blade, but how did you get the original angle on the jig dead on? Or was the scms already perfect?
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post #4 of 6 (permalink) Old 07-28-2012, 11:04 AM
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Very basically: a complete circle is 360 degrees. An analog clock indicates all angles. One hour (on the hour hand) = 30 degrees. One minute (on the minute hand = 6 degrees). These may help you to visualize what you're approaching. Complementary angles add to sum 90 degrees. When different angles are used that are complimentary the skew length varies and the hypotenuse (where said cut occurs) is a different length. Two equal angles mate-up to a nice match - regardless of the sum. Two 22.5 degree angles (having the same hypotenuse length) will mate-up perfectly to make certain that equal thickness workpieces match-up. I hope this helps. Sketches on graph paper help!

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post #5 of 6 (permalink) Old 07-28-2012, 07:13 PM
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Otis; are you suggesting Bob didn't use a gizmo to make his jig?!
Me, I'd have used my large draughting sq. I don't foresee a time when I'll be more
conscious of an error factor less than than Staedtler Mars' products.
STAEDTLER protractors
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post #6 of 6 (permalink) Old 07-28-2012, 07:26 PM
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Hi Dan

No gizmo used just the chop saw needed..it has all the marks I need on it..

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