sketch polygon tool limitations and sheet metal transitions

I am trying to model a sheet metal part which has 27 equal facets on
one end and non equal facets on the other end.Essentially it is a
transition from a round to a square, but to get bend lines, I draw the
round as a 27 facet polygon cut in half. Follow? The other side has
two corners with 12 facets each, plus 2 side faces and the top face
equal 27 as well.

I am trying to build this in a way that I can drive the transition
from a spread sheet, making the diameter changeable and the smoothness
as well.

My first attempt at this was to draw a polygon using the sketch
polygon tool, but it limits me to 40 sides. Does anyone know a way
around this?

I also tried a sketch circular pattern, but i cannot drive the number
of facets, thereby making it only suitable for one-off stuff.
Any suggestions welcome.

Cheers
Tom

 

Tom,

I guess that you know about the sheet metal loft. I would assume you have
the same problem with it that I do. No bend lines on the unfold. As far as
your question I think you might be getting into a VBA application. I did
have one idea, maybe 2 polygons (construction geometry) with the same center
& diameter and half the number of vertices you require. One would be rotated
1/2 the angle between the vertices. Then connect lines between all the
vertices to get the required number of facets. That would double the
limitation Solidworks has. Just a thought.

It might be easier to use the sheet metal loft and then use equations to
draw bend lines on the flat pattern configuration. Another thought..