## circle segments

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Anonymous
2012-07-19
2013-03-08
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• Anonymous
2012-07-19

Hi all, I've got a problem with big circles.
I make a big circle in inkscape, then copy and paste the circle into pycam. EMC then makes the machine cut the circle in 30 or so linear segments. This is fine for small circles but how do I increase the number of segments for big circles?
Cheers,
Matt

• Nobody/Anonymous
2012-07-19

Hi Matt,

this behaviour is currently not configurable.
And PyCAM just can't know if a radius of 100 should be considered as "big" or "mall" …
(any ideas for a generic and non-interactive evaluation are welcome)

Anyway, you can change the default (32)  in pycam/Geometry/__init__.py around line 87:

```def get_points_of_arc(center, radius, a1, a2, plane=None, cords=32):
```

Or you convert the circle into a path (in Inkscape) and add some more nodes.
(just select all current path nodes and click at "add node" multiple time)

cheers,
Lars

• Nobody/Anonymous
2012-07-20

I wonder if someone that is MUCH better than I am at Python could get the instruction to actually use arc commands rather than straight lines implementing the chords?

Possibly a quick calculation to make the 'chords=32' if radius is under 1", or 32 times the radius for diameeters over 1" (made integer and rounded down).  Something like that anyway.

• Lars
2012-07-20

Using real arcs is a bit tricky, since this would influence *all* 2D geometry code. Currently PyCAM just handles polygons that are made of lines. Adding arcs would increase complexity by a good amount.

Regarding the numbers: PyCAM is agnostic to the meaning of numbers - they can be mm or inches or even meters (not implemented, yet). Milling machines can also vary in size :)
Anyway: PyCAM currently treats 2D models more or less as vector graphics (like svg). Thus its details are not supposed to change depending on its scale. At least that's my current oppinion. Any alternative approaches are welcome!

I guess the good (long-term) approach will be to ask the user for a kind of maximum tolerance before opening a model file. This will allow PyCAM to adjust the number of circle segments depending on the tolerance.

cheers,
Lars

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