Sectional arc

[freedman]

Another way to go about this is to use the Nth Polygon tool. It can give equal spacing and sketcher points.

[heda]

inspired by mario52 macros...

this could very well be a task where it is more easy for everyone involved,
to explain how to code the creation of the wheel,
rather than how to do it in the gui

Code: Select all

import Draft
Vector = Draft.Vector

n = int(18)
angle = 360/n
radius = 10

line = Draft.makeLine(Vector(0,0,0), Vector(radius, 0, 0))
arc = Draft.makeCircle(radius, startangle=0, endangle=angle)
for i in range(1, n):
  Draft.rotate(line, angle*i, copy=True)
  Draft.rotate(arc, angle*i, copy=True)

[papyblaise]

We don't know what the purpose is
- cut a pizza into 18 parts,
- cut a birthday cake for 18 kids
- make a western cart wheel with 18 spokes
one of the best solutions is that of Freedman
another is to make a sector at 20 ° and reproduce it by Polar Array 18 occurs

[mario52]

Hi

I want to draw an arc and have it sectioned in 18 equal parts. I wonder how I can do it?

just sectional one arc not circle

mario

[degarb]

inspired by mario52 macros...

this could very well be a task where it is more easy for everyone involved,
to explain how to code the creation of the wheel,
rather than how to do it in the gui


I actually understood your explanation heda. However, I couldn't get the line to anchor when holding alt when I drew it. So, when I changed the angle of the copied line, the line sometimes would rotate, sometimes move all around the screen. I ended up importing your drawing and modifying that one, then moving the fan deck to the place where I needed it to align my other items.

That solved, I still have a huge 90 degree arc, and I added thingamigs on the one side. However the laser cutter will likely lop off the thingys because I cannot recreate my arc with mini arcs to allow the thingamabobs to attach without the arc line under them. The stop start values are too random and impossible to calculate to type in the mini arch numbers and the mouse method is too imprecise. ...Life would be so much easier if the line split tool would work on my arc. I could just click and split my arch into 15 sections, not equal, but at the edge where my dohickies are attaching. Deleting my big arc ad doing trial and error start and stop digits for 25 minor lines will take me hours. Drawing many little arcs by mouse is impossible on a 17 inch screen.

Thanks for the help, heda I can't understand why I couldn't always get my lines anchored to the one spot. I chalk it up to another weird quirk of the software, or my greenness. I read, watched videos, and tried to figure out the polar array. Other people were doing quite different things, using different versions. I have an array button, not the polar array button other people, used. I would select and object, hit array, modify it to polar, it would properly nest my object under the array in the tree. But then I was dead in the water, seeing nothing more I could do, finding nothing applicable in the docs, videos, or searches.

[papyblaise]

Ha this time, if I understood correctly, you want to cut an arc of any length in 18 equal parts
You draw your arc, place a Draft WB point at the origin (important)
select arc and point, use PathArray = 18 ocures