[TheForge] RE: Stick rod vs mig (Larry Brown)

[Andrew Vida]

Mike Spencer wrote:
> artgawk wrote:
> 
>> When forging hollow body pieces..synclastic forming sort of stuff 
>> where the steel is really pushed to it's limits.
> 
> Synclastic?  *Synclastic*?!  I thought Kurt Vonnegut made that up --
> his "chrono-synclastic infundibulum" or broken together in time.  And I
> made up "clathro-synclastic", broken together in a basket, as in,
> Don't put all your eggs in one...." 

	A synclast is a compound-curved form where the curves are convergent. 
The easiest way to tell is that there is one convex face and one concave.

	The anticlast is a compound-curved form where the curves are divergent. 
  A two-sided anticlast will have 2 concave and 2 convex faces, i.e. 
each face is both convex and concave.
> 
> Googledy-google.....oh.  Right.
> 
>     <mathematics> Curved toward the same side in all directions; said
>     of surfaces which in all directions around any point bend away
>     from a tangent plane toward the same side, as the surface of a
>     sphere; opposed to anticlastic. 
> 
> A compound surface.  Never heard that one.  And "anticlastic", a
> saddle shape.  Some metalsmithing professor has been reading math
> books to spice up his lectures.

	Simple curvature is topographically a cylinder or some part thereof. 
IOW, it curves in one plane only.  Compound curvature possesses 
curvatures in two or more planes.