Member

Thread Tools  Display Modes 
How do you determine angles?
When making edging ... How do you determine what angle to cut at to make the two fit together at the angle?
I'm new and can not figure out how to do this.
I'm new and can not figure out how to do this.
Sponsored Links  
Advertisement 

first determine the angle ....
You must determine the angle first. Then you bisect it, then divide it into two equal parts. You will need to know the number in degrees ... which is what you set your miter saw to. For example for a 90 degree corner, the most common, the miter saw is set to 45 degrees, or 1/2 of 90 degrees. A 45 degree corner would have 22 1/2 degrees per piece.
Now is where it gets interesting... there is no setting on a miter saw for 22 1/2 degrees. Miter saws are scaled to cut the amount subtracted away from 90 degrees.
For a complete and through discussion of this go here:
'http://www.woodworkingtalk.com/f27/anglessettingmitersaw9644/
Now is where it gets interesting... there is no setting on a miter saw for 22 1/2 degrees. Miter saws are scaled to cut the amount subtracted away from 90 degrees.
For a complete and through discussion of this go here:
'http://www.woodworkingtalk.com/f27/anglessettingmitersaw9644/
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)
My old (1985) 10" Delta miter saw actually has pin stops at 90, 22.5 and 45 degrees. It was cutting crown molding upside down and backwards that jiggled my tiny brain.
Sponsored Links  
Advertisement 

Member
Thank you both.
My main question is, HOW do you determine the angle?
For example, how do you look at a wall or box you are trying to trim, and know, that is a 60 degree angle?
Where do you get the 60 from? How do you determine that?
My main question is, HOW do you determine the angle?
For example, how do you look at a wall or box you are trying to trim, and know, that is a 60 degree angle?
Where do you get the 60 from? How do you determine that?
Quote:
Originally Posted by Microscopes
View Post
Thank you both.
My main question is, HOW do you determine the angle?
For example, how do you look at a wall or box you are trying to trim, and know, that is a 60 degree angle?
Where do you get the 60 from? How do you determine that?
My main question is, HOW do you determine the angle?
For example, how do you look at a wall or box you are trying to trim, and know, that is a 60 degree angle?
Where do you get the 60 from? How do you determine that?
Member
OK i guess i'm screwed haha.
Senior Member
Do you have one of these:
“Everything we hear is an opinion, not a fact. Everything we see is a perspective, not the truth.”
― Marcus Aurelius
FrankC
http://sawdustmaking.com
Member
I do not, but I could buy one.
How does it work?
How does it work?
Member
I found this: http://www.homedepot.com/p/Husky5i...822H/206007248
Seems like it would work well for me.
So... For a miter saw. If I have an angle of 90 degress. Half of that is 45 and then 22.5. You then subtract that from 90 = 67.5.
So for a 90 degree angle, you set your miter at 67.5 ... correct?
Seems like it would work well for me.
So... For a miter saw. If I have an angle of 90 degress. Half of that is 45 and then 22.5. You then subtract that from 90 = 67.5.
So for a 90 degree angle, you set your miter at 67.5 ... correct?
Last edited by Microscopes; 01092016 at 04:58 PM.
Quote:
Originally Posted by Microscopes
View Post
I found this: http://www.homedepot.com/p/Husky5i...822H/206007248
Seems like it would work well for me.
So... For a miter saw. If I have an angle of 90 degress. Half of that is 45
and then 22.5. You then subtract that from 90 = 67.5.
So for a 90 degree angle, you set your miter at 67.5 ... correct?
Seems like it would work well for me.
So... For a miter saw. If I have an angle of 90 degress. Half of that is 45
and then 22.5. You then subtract that from 90 = 67.5.
So for a 90 degree angle, you set your miter at 67.5 ... correct?
You need an adjustable protractor something like this:
http://www.ebay.com/itm/GeneralTool...59684866&rt=nc
You had it correct and then went bonkers....
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; 01092016 at 05:19 PM.
Member
Quote:
Originally Posted by woodnthings
View Post
Bisect means divide in half... stop there.
You need an adjustable protractor something like this:
http://www.ebay.com/itm/GeneralTool...59684866&rt=nc
You had it correct and then went bonkers....
You need an adjustable protractor something like this:
http://www.ebay.com/itm/GeneralTool...59684866&rt=nc
You had it correct and then went bonkers....
Ok thank you!
Senior Member
Use your Tbevel, one leg on each piece you're trying to find the angle of to get the included angle.
Then take a look at this: http://strader.cehd.tamu.edu/geometr...sectangle.html to bisect that angle.
Set the Tbevel to the bisected angle and use it to set your miter saw.
Then take a look at this: http://strader.cehd.tamu.edu/geometr...sectangle.html to bisect that angle.
Set the Tbevel to the bisected angle and use it to set your miter saw.
"If I agreed with you, then we'd both be wrong!"
Senior Member
I use, and recommend, a digital protractor like the Husky linked to above.
I guess the one 'obvious' thing to keep in mind is when you make an angled cut in a straight board, you are essentially generating two angles  one angle on the board you keep, and another angle on the scrap.
Now, on a simple 45, you make essentially the same angle in each piece (of course, the orientation is different, if the board has a molding along one edge).
I guess the one 'obvious' thing to keep in mind is when you make an angled cut in a straight board, you are essentially generating two angles  one angle on the board you keep, and another angle on the scrap.
Now, on a simple 45, you make essentially the same angle in each piece (of course, the orientation is different, if the board has a molding along one edge).
Member
Ok bought the protractor, and it has 2 readings.
132 inside
237 outside
At the risk of sounding very stupid, which do I use??
This is what I am trimming?
132 inside
237 outside
At the risk of sounding very stupid, which do I use??
This is what I am trimming?
Member
THANK YOU to everyone by the way. It means a lot that the advanced woodworkers are willing to take time out of their day to answer amateur questions.
One of these is a must in any shop....
OK, it's greater than 90 degrees...
For an example you can't fit a cardboard box in the intersection....NOPE. So it's more than the 90 degrees like on the corners of a cardboard box. Then what? How much more? Well, a straight line would be 180 degrees or zero degrees of angle. It's less than that... RIGHT. So, it must be the 132 degree for the interior angle, which is "obtuse" or more than 90 degrees. An "acute" angle is less than 90 degrees, like 45 or 30 degrees.... FYI.
I recommend a "digital" protractor like this:
http://www.ebay.com/itm/7Electronic...MAAOSw8lBTq1nA
I recommend a "digital" protractor like this:
http://www.ebay.com/itm/7Electronic...MAAOSw8lBTq1nA
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 BigJim; 01102016 at 06:06 PM.
Senior Member
One other thing to do is to use a board or just a piece of paper to eyeball (and mark) what the general cut should look like. You'll only use this to confirm your exact angle is in the ballpark.
If you need to, lay it out with two overlapping pieces of paper (one on each wall) so you can visualize what the cut should look like.
You can also set your protractor to 1/2 of 132 degrees (66 degrees) which should be your miter cut. Use your protractor to set your miter saw (assuming that is what you are using). If you are using about a 5" digital protractor, like the one linked to above, it will fit in/around a miter saw so you can set the angle on the saw from your protractor. It would be harder to do with the other (nondigital) ones shown.
By the way, there is some error in your measurement, as the inside and outside angles should equal 360 degrees (the number of degrees in a circle). Adding your 132 inside plus 237 outside equals 369 degrees. Something there isn't quite right.
If you need to, lay it out with two overlapping pieces of paper (one on each wall) so you can visualize what the cut should look like.
You can also set your protractor to 1/2 of 132 degrees (66 degrees) which should be your miter cut. Use your protractor to set your miter saw (assuming that is what you are using). If you are using about a 5" digital protractor, like the one linked to above, it will fit in/around a miter saw so you can set the angle on the saw from your protractor. It would be harder to do with the other (nondigital) ones shown.
By the way, there is some error in your measurement, as the inside and outside angles should equal 360 degrees (the number of degrees in a circle). Adding your 132 inside plus 237 outside equals 369 degrees. Something there isn't quite right.
Last edited by pweller; 01102016 at 05:56 PM.
«
Previous Thread

Next Thread
»
Thread Tools  
Show Printable Version Show Printable Version
Email this Page Email this Page


Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Calculating Angles  desertjim  General Woodworking Discussion  15  10112018 02:36 PM 
Determine best position for turning?  thenodemaster  Woodturning  12  12192015 11:29 AM 
how do I get PERFECT 45 degree angles  agrandfathers_legacy  Tips, Tricks, & Homemade Jigs  15  08222015 06:19 PM 
Posting Rules  