Author Topic: Negative Overlay  (Read 885 times)

0 Members and 1 Guest are viewing this topic.

Offline Gioreva

  • Contributor
  • Posts: 18
Negative Overlay
« on: April 30, 2019, 10:07:50 am »
Hi
How can I draw Negative Overlay?

Black is Overlay.

I don't think we can make negative gherber.
 

Offline ddavidebor

  • Super Contributor
  • ***
  • Posts: 1162
  • Country: gb
    • Fermium
Re: Negative Overlay
« Reply #1 on: April 30, 2019, 12:17:36 pm »
You can create a polygon, then use one of the convert tools on your shape (under tools-->create cutout from select primitives) to create a cutout on that polygon.


For the text, there is an option to make it negative if you select "truetype"

Another option is to draw it in a software like autocad, explode it,  then create polygons once imported in altium.

Another option, you can draw it positive then invert the gerbers in postprocessing.
Still, the last one, draw it positive and tell the fab house to invert it.
Davide Bortolami,
Fermium LTD
 

Offline Gioreva

  • Contributor
  • Posts: 18
Re: Negative Overlay
« Reply #2 on: April 30, 2019, 01:36:22 pm »
Tanks.

I can't import DXF, only rectangles or circles appear, but the numbers don't appear. (Number = Curve)

I'm trying the first option, but text are not recognised as primitive.

I create poligon Pour
I place True Type Text, Inverted or not.
I select both
(v19) Tools -> Convert -> Creates Poligon from selected Primitives.
>>>> Could not find closed shape using primitives centerline due to the following error:
>>>> At least 2 connected traks/arc or full circle required

If I create rectangle using line, select rectangle and text.
(v19) Tools -> Convert -> Creates Poligon from selected Primitives.
It creates it without errors, but the text is not subtracted.



 

Offline luismh

  • Newbie
  • Posts: 4
  • Country: ar
Re: Negative Overlay
« Reply #3 on: April 30, 2019, 02:32:57 pm »
 

Offline T3sl4co1l

  • Super Contributor
  • ***
  • Posts: 14753
  • Country: us
  • Expert, Analog Electronics, PCB Layout, EMC
    • Seven Transistor Labs
Re: Negative Overlay
« Reply #4 on: May 01, 2019, 03:39:04 am »
Still another option: generate SVG, load SVG into a TTF font file e.g. with glyphter.com then place a string with that character on the board.  Size as needed, set inverted.

Tim
Seven Transistor Labs, LLC
Electronic design, from concept to prototype.
Bringing a project to life?  Send me a message!
 

Offline Gioreva

  • Contributor
  • Posts: 18
Re: Negative Overlay
« Reply #5 on: May 06, 2019, 08:27:49 am »
I can ask the supplier to reverse, but the online prototypes are not very helpful, it's all automatic.

You can create a polygon
ddavidebor  help
Ma sei Italiano ?

I read the post, but it's not for me.
« Last Edit: May 06, 2019, 10:44:12 am by Gioreva »
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf