tscarborough

jshuatree · Feb 21, 2010

if u have the rise of an arch and the span can u get the radius

Crosby · Feb 21, 2010

jshuatree said:
if u have the rise of an arch and the span can u get the radius

Really??

jshuatree · Feb 21, 2010

yes really I know I ask all the hard ones ....is this even possible without just keep on adjusting your line till u get it right Im looking for a formula I can do it through trial and error

Crosby · Feb 21, 2010

what type are you building?

jshuatree · Feb 21, 2010

Im not building one Itjust seems like there should be a formula of some kind ...and Im always trying to learn everything even the stuff in the trade that arent used much anymore like steriotomy....but it would be a segmental

Crosby · Feb 21, 2010

jshuatree said:
Im not building one Itjust seems like there should be a formula of some kind ...and Im always trying to learn everything even the stuff in the trade that arent used much anymore like sterionimy

there is a lot of different arches, if everything was a perfect circle we wouldn't need a saw.

Crosby · Feb 21, 2010

I'm sorry i didn't see you edited your post so you want to know about a segmental arch it' a semi circle

jshuatree · Feb 21, 2010

pleease explain

Crosby · Feb 21, 2010

u sure your not talking about the The Alan Parsons Project, steriotomy

Crosby · Feb 21, 2010

what would you like me to explain?

jshuatree · Feb 21, 2010

did I spell it wrong steriotomy the practice of cutting and shaping stone...explanation of how a jack arch is like a segmental and is it possible to get the radius with just the rise and the span of an arch without using the trial and error method

Crosby · Feb 21, 2010

jshuatree said:
did I spell it wrong steriotomy the practice of cutting and shaping stone...explanation of how a jack arch is like a segmental and is it possible to get the radius with just the rise and the span of an arch without using the trial and error method

it's not, a jack arch is flat that needs steel, a segmental is a curve that is actually less than a semi circle which the curvature holds it together..

jshuatree · Feb 21, 2010

sorry i read that wrong I thought i saw jack arch...i know about segmentals gothics semicircle ...for the segmental it seems if u have the rise and span there should be a way to get the radius without jacking around with the line so much

Crosby · Feb 21, 2010

when you are level on your columns where you start your arch you pull a line assuming your line/columns are level you figure out your rise from there, the rest is mathematics.

Crosby · Feb 21, 2010

This will help http://en.wikipedia.org/wiki/Semicircle I have the benefit of carpenters but if your interested in theory ur all set.

jshuatree · Feb 21, 2010

thanx thats gonna come in handy

Crosby · Feb 21, 2010

no problem, you should to pull a line on the first course of your columns from end to end to keep em straight or else it will look like it's walking away.

Crosby · Feb 21, 2010

once i get my square wall line for my piers i shoot a laser up and hang drop lines and pull another line ( spring line) where the arches start. hanging lines is key if u can..

bytor · Feb 21, 2010

I think this is the formula that you're after:

h = the rise of the arch (from your level 'span' line)
l = the span of the arch

bytor · Feb 21, 2010

Crosby said:
a jack arch is flat that needs steel ..

A properly built 'jack' arch will not require steel

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