as requested on support…
(paraphrasing)
a series of 3 nested octagons are required, the innnermost no more than 20" in diameter, the second is made of 3" wide boards, and the last is a framing of 1/2" wide, 3" tall boards.
which radius does CC use? Circumcircle radius (R) or Innercircle Radius (r)
This is pretty easily checked in Carbide Create. First, draw a 40" diameter circle:
Then, draw a regular polygon:
and one sees that the regular polygon is inscribed inside the circle, and changing to an octagon:
Preserves that.
If one wants a specific perimeter thickness, this is easily done by rotating the octagon so that the top/bottom are orthogonal to the XY coordinate system:
Done
Then draw a rectangle from one side to the other:
Set its height to match the board thickness:
Drag it into alignment:
Then draw lines to cut the ends off at the requisite angle:
Select the Polyline and the rectangle:
and use Trim Vectors to cut the ends off at the desired angle:
and remove the elements which are not wanted:
until one arrives at:
OK
OK
Note that one wants to Join Vectors":
One may verify that this will work by using a Circular Array to replicate as desired:
Pick Center in Window:
Increase the number of elements:
Drawing octagons for the outside is similar — the positions may be calculated with trigonometry, or drawn as an intersection:
Draw a rectangle of the height of the width of board one wishes to use:
ensuring it is longer than the outside length dimension of a given segment, then drag it into position so that it is longer than the inner segment:
Draw a line which has the wanted angle:
Done
Drag it so that one end is positioned at the center:
Shift-click on the rectangle to add it to the selection:
and again use Trim Vectors to get the end trimmed:
OK
That outer point may now be used to draw a new polygon:
which when changed into an octagon:
and rotated:
Done
May be used to create another segment for the next level of the octagon:
which again, may be replicated using a Circular Array:
and the above processes repeated at need to nest as many octagons of whatever width one might require.
Then, the parts may be duplicated and arranged on the Stock in a file:
n
and cut out and then joined together:
