#1  
Old 09-07-2009, 10:13 AM
Apprentice
 
Join Date: Jan 2009
Location: saugerties, ny
Posts: 193
Default How to draw/figure the door arch?

Hello,
With an opening 19" wide x 12"high, how do I figure the arch? I want to build the form for setting the arch brick but it isn't a clean hemisphere, it's more elliptical. So I guess that's my question: How to figure out the arc of an ellipse. A quick Internet search turns up that I will need at least a rudimentary MIT education but I have to believe there's another approach. How about eyeballing it?
Thanks
Kim
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  #2  
Old 09-07-2009, 11:09 AM
Il Pizzaiolo
 
Join Date: Mar 2009
Location: USA
Posts: 1,436
Default Re: How to draw/figure the door arch?

Hi Kim,
I made my own compass rom an old piece of wood, Made a spot for a carpenter pencil on one end and a sharpened screw on the other, Drew up the bottom and 2 sides of the arch on a piece of plywood, Using my homemade compass to form a nice looking arch across the top, Moving the compass up or down on the center line changes the height of your arc,, Sounds a little confusing, But I may not be explaining it as well as i should be, Hope the pictures help

Last edited by ThisOldGarageNJ; 08-16-2010 at 06:49 PM.
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  #3  
Old 09-07-2009, 11:32 AM
Master Builder
 
Join Date: Jul 2009
Location: Los Angeles
Posts: 942
Default Re: How to draw/figure the door arch?

I think the degree or style of curvature of the arch should simply be pleasing to your eyes.
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  #4  
Old 09-07-2009, 11:45 AM
Il Pizzaiolo
 
Join Date: Jan 2007
Location: Tampa, FL
Posts: 1,446
Default Re: How to draw/figure the door arch?

I think most of the forum would tend to agree with fxpose, appearance and fuctionality are the key.
Is it just me, or is the recent new wave of builders a little too focused on the math and creating the "perfect" (based on their intense calculations) geometric shapes?
Just my observation.
RT
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  #5  
Old 09-07-2009, 12:09 PM
Apprentice
 
Join Date: Jan 2009
Location: saugerties, ny
Posts: 193
Default Re: How to draw/figure the door arch?

I just solved it myself mostly by eyeballing it. Looks good enough. thanks
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  #6  
Old 09-07-2009, 02:46 PM
christo's Avatar
Master Builder
 
Join Date: Feb 2006
Location: Eastern NC
Posts: 910
Default Re: How to draw/figure the door arch?

May not work for all, but I drew the rough shape of the arch I'd like on cardboard. Stuck a nail through the cardboard at each intersection of wall and arch, tied a loose string between the two, set it upside down so the string would hang in rough approximation to my sketch and corrected my sketch to match the cantenary curve of the string.

Even then, I think I may have deviated a bit from that curve to make something a bit more pleasing...
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  #7  
Old 09-07-2009, 05:56 PM
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Location: Kaysville, Utah
Posts: 291
Default Re: How to draw/figure the door arch?

I eyeballed mine on a piece of cardboard and then folded it in half to make it symmetrical.

Joe
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Old 09-07-2009, 05:59 PM
Il Pizzaiolo
 
Join Date: Mar 2009
Location: USA
Posts: 1,436
Default Re: How to draw/figure the door arch?

hey JM

simplicty..... I think you have the best and easiest idea

Mark
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  #9  
Old 09-07-2009, 06:10 PM
Il Pizzaiolo
 
Join Date: Jan 2007
Location: Tampa, FL
Posts: 1,446
Default Re: How to draw/figure the door arch?

jm, thats simplicity at its best......does anyone else remember in kindergarten when they taught us to fold our paper in half before cutting to make a symmetrical shape?

RT
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  #10  
Old 09-10-2009, 08:09 PM
Apprentice
 
Join Date: Jul 2009
Location: Cochrane, Alberta
Posts: 104
Default Re: How to draw/figure the door arch?

I am making the arch the same curvature as the oven dome and floor and am using the floor template as a guide for the arch. I cut a piece of plywood the width of my door then drew the arch on them tracing the arch from the floor template.
I have not built my arch yet but it should work.....

Last edited by Spunkoid; 09-11-2009 at 09:01 AM.
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