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Old    Jagermaster (jaegermaster)      Join Date: Sep 2002       10-02-2010, 7:44 AM Reply   
I am trying to find the radius of this piece I need to cut out of a 24" glu lam beam. Can anyone help? Is there even enough info to get the radius? I hope my crappy drawing is decipherable.

Thanks for any help.
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Old    Jagermaster (jaegermaster)      Join Date: Sep 2002       10-02-2010, 8:11 AM Reply   
If the drawing doesn't make sense, I have a 24"X109" beam. I need to cut a 10 1/2" wide radius out of it.

Thanks for any kind of response.
Old    W (pwrvelocity)      Join Date: Jan 2007       10-02-2010, 11:38 AM Reply   
D = 2r

D = Diameter
r = radius

2 (10.5") = 21"
Old    Brett Davis (bdavis)      Join Date: Sep 2002       10-02-2010, 11:50 AM Reply   
I'm pretty sure that's wrong w. I don't have a formula. But I would lay the beam on the ground. Have another person hold the end of a string and move far enough away until you can achieve the arc you want. The length of th string is your radius
Old    W (pwrvelocity)      Join Date: Jan 2007       10-02-2010, 12:02 PM Reply   
Pretty sure I'm wrong????? Look it up in your Geometry book, Einstein!
Old    Nick Tomsyck (sidekicknicholas)      Join Date: Mar 2007       10-02-2010, 12:30 PM Reply   
From that picture 10.5" is only a piece of the radius..... just the portion of the radius of 109" of the circle.... the radius in fact would be much much larger.


On the drawing - are you cutting out a 10.5" wide piece (e.i. - 2 cuts -top and bottom)? or just one cut 10.5" from the base of the board?


@ W - 1st post he is looking for the radius, so you have a equation - that is no help. good job.

Last edited by sidekicknicholas; 10-02-2010 at 12:36 PM.
Old    Jon Hunter (hunter660)      Join Date: Aug 2007       10-02-2010, 1:56 PM Reply   
Outside = 157.1905"
Inside = 146.6905"
Old    GD (diamonddad)      Join Date: Mar 2010       10-02-2010, 2:08 PM Reply   
You could calcute it from the 3 point math...

http://local.wasp.uwa.edu.au/~pbourk...y/circlefrom3/
Old    Jagermaster (jaegermaster)      Join Date: Sep 2002       10-02-2010, 2:31 PM Reply   
I need to make both the top and bottom cuts.
Old    Jagermaster (jaegermaster)      Join Date: Sep 2002       10-02-2010, 2:53 PM Reply   
I found this equation which apparently will give me the radius, but I'm not sure how the math works.

http://mathforum.org/library/drmath/view/69144.html
Old    Jonathan Bay (john211)      Join Date: Aug 2008       10-02-2010, 3:23 PM Reply   
inside r = [(109 / 2) **2 + 10.5 **2 ] / 2 * 10.5 = 146.69

outside r = 146.69 + 10.5 = 157.19
Old    Jagermaster (jaegermaster)      Join Date: Sep 2002       10-02-2010, 4:32 PM Reply   
Thanks everybody. I'll let you know how it turns out.
Old    Jagermaster (jaegermaster)      Join Date: Sep 2002       10-04-2010, 6:24 PM Reply   
Here is the final outcome. Thank you all for your help. I really appreciate it.

Before, during and complete.
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Old    A. P. (bigdad)      Join Date: Apr 2002       10-05-2010, 8:18 AM Reply   
Did someone call the cops on you?
Old    Mattgettel (mattgettel)      Join Date: Jan 2009       10-05-2010, 9:00 AM Reply   
They must have heard you had doughnuts.
Old    Jagermaster (jaegermaster)      Join Date: Sep 2002       10-05-2010, 9:28 AM Reply   
No, I have a Sheriff's Deputy that lives across the street. I do think I piss him off sometimes when I am working in the garage and he is on night shift. Oh well.
Old    Big D (bigdtx)      Join Date: Feb 2005       10-05-2010, 11:25 AM Reply   
So what's it going to be?
Old    Big D (bigdtx)      Join Date: Feb 2005       10-05-2010, 2:27 PM Reply   
And what did you use to make the cut? That's a pretty mondo cut regardless of the tool.
Old    Jagermaster (jaegermaster)      Join Date: Sep 2002       10-05-2010, 7:37 PM Reply   
It's going in between two entry columns on a custom home. I cut it for a local builder.

I made a template out of 1/2" ACX plywood and used a 2hp plunge router with a collar. I took about 1/8" of depth per pass. The sketchy part was I could only rout 2 1/2" deep and then I had to flip it and get the template lined up exactly to rout the other side.

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