Rib dimensions

[Ron Nossaman]

---------------------- multipart/mixed attachment

>Lots of good methods for calculating the radius of an arc have been 
>provided. But there is also the question of whether the curve is a true 
>arc or some other shape (this assumes you have a specific shape as a 
>target). Most of the provided methods do not address that concern - in 
>fact you could have an obtuse angle with two straight sides rather than an 
>arc. That's why I suggested making a number of measurements along the 
>curve - offsets from a straight line.
>
>Terry Farrell

Or draw a 60' arc on a piece of cardboard, masonite, or some such using the 
two-straightedge method. Cut it out and do a direct comparison with the 
crowning jig to match contours. If the jig crown is adjustable (rather than 
using replaceable forms) and relatively simple, it's almost surely not 
going to produce an arc segment anyway. But then I know of no evidence 
indicating that arc, parabola, catenary, hyperbola, or any other specific 
or random curve you could produce is better than any other - within reason.

Ron N

---------------------- multipart/mixed attachment

---

Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.545 / Virus Database: 339 - Release Date: 11/27/2003

---------------------- multipart/mixed attachment--