Author Topic: DXF Roundness isn't round (small flat pieces)  (Read 820 times)

Offline kobu83

  • Ewok
  • *
  • Posts: 10
    • View Profile
DXF Roundness isn't round (small flat pieces)
« on: February 22, 2022, 14:51:19 pm »
DXF opened in cambam, but the roundness isn't round.
 
When i open the dxf file in solidworks it have perfect roundness, when open the file in cambam (version 1.0) the roundness are many flat pieces.

What can i do? See picture.


Offline dh42

  • Administrator
  • CNC Jedi
  • *****
  • Posts: 7048
    • View Profile
    • Cambam V1.0 French Doc
Re: DXF Roundness isn't round (small flat pieces)
« Reply #1 on: February 22, 2022, 17:53:24 pm »
Hello

Can you share the DXF itself ?

++
David

Offline kobu83

  • Ewok
  • *
  • Posts: 10
    • View Profile
Re: DXF Roundness isn't round (small flat pieces)
« Reply #2 on: February 22, 2022, 18:35:54 pm »
Not at home right now, will share it about an hour.  :)

Offline EddyCurrent

  • CNC Jedi
  • *****
  • Posts: 5115
  • Made in England
    • View Profile
Re: DXF Roundness isn't round (small flat pieces)
« Reply #3 on: February 22, 2022, 19:12:19 pm »
Have a look in menu item, Tools->Options->Arc Display Degrees.

If that is set too low then curves will look like polygons. A value of 0.1 works for me.
« Last Edit: February 22, 2022, 19:19:10 pm by EddyCurrent »
Filmed in Supermarionation

Online lloydsp

  • CNC Jedi
  • *****
  • Posts: 8723
    • View Profile
Re: DXF Roundness isn't round (small flat pieces)
« Reply #4 on: February 22, 2022, 19:16:29 pm »
I might just add to Eddy's helpful comment that, for your own erudition, you should try several settings, including much MORE coarse as well as finer, just so you can visualize the effect it has.

Lloyd
"Pyro for Fun and Profit for More Than Fifty Years"

Offline EddyCurrent

  • CNC Jedi
  • *****
  • Posts: 5115
  • Made in England
    • View Profile
Re: DXF Roundness isn't round (small flat pieces)
« Reply #5 on: February 22, 2022, 19:21:27 pm »
As Lloyd said, try 20 and then 0.1.
Most important though, you must save the settings before they take effect, Tools->Save settings.
Filmed in Supermarionation

Offline kobu83

  • Ewok
  • *
  • Posts: 10
    • View Profile
Re: DXF Roundness isn't round (small flat pieces)
« Reply #6 on: February 26, 2022, 14:05:14 pm »
Sorry for late reaction, I have tried the things u all said but it didn't help to mee.

Here is the CB file so u can test what is wrom maybe.

I hope someone has the answer :) :)

I see now, when i draw a circle in cambam, and zoom in, this circle is also build of little flat lines...?
« Last Edit: February 26, 2022, 14:44:23 pm by kobu83 »

Offline EddyCurrent

  • CNC Jedi
  • *****
  • Posts: 5115
  • Made in England
    • View Profile
Re: DXF Roundness isn't round (small flat pieces)
« Reply #7 on: February 26, 2022, 14:43:32 pm »
Having looked at the polylines in your file, they each consist of a series of STRAIGHT sections, none of them have "Bulge" which you need to create a curved line.

Please attach the dxf file you are using to see what that looks like.
Filmed in Supermarionation

Offline dh42

  • Administrator
  • CNC Jedi
  • *****
  • Posts: 7048
    • View Profile
    • Cambam V1.0 French Doc
Re: DXF Roundness isn't round (small flat pieces)
« Reply #8 on: February 26, 2022, 15:00:38 pm »
Hello

Quote
I see now, when i draw a circle in cambam, and zoom in, this circle is also build of little flat lines...?

Yes but only for the display, if you cut the circle, it's a true circle. (and if you convert the circle to polyline, the display is dependent of the value of "arc display degree" in the options ; I use 0.5° for this setting)

There is no setting for the circle display

CamBam must be restarted after arc display degree has been changed.

Quote
Arc Display Degrees

Arcs are displayed using multiple line segments. This setting defines the angle between each segment. Smaller numbers make smoother curves but slower display rates.

++
David

Offline EddyCurrent

  • CNC Jedi
  • *****
  • Posts: 5115
  • Made in England
    • View Profile
Re: DXF Roundness isn't round (small flat pieces)
« Reply #9 on: February 26, 2022, 20:05:12 pm »
To put some curve (bulge) back in, select all the polylines then use menu item, Edit->Polyline->Arc Fit, with a tolerance of 0.1
Filmed in Supermarionation