User:Asj/Notes about laser cutting solder stencils: Difference between revisions

Latest revision as of 21:29, 20 May 2024

Most pads are ok - perhaps a bit large.

Change the pad clearance in Lightburn
- File -> Board Setup -> Solder Mask Paste
- "Solder paste absolute clearance" -> -0.09mm
Configure Light burn to engrave at
- 100mm/s at 28%
- Line interval of 0.02mm

I like to soak a piece of paper in water and put it below the mylar. This helps reduce burning and warping

@@ Line 1: / Line 1: @@
 Most pads are ok - perhaps a bit large.
-Small pitch QFN packages are a problem. To do these,
+* Change the pad clearance in Lightburn
+** File -> Board Setup -> Solder Mask Paste
-* For each QFN pad, downsize "solder paste absolute clearance" to -0.09 and produce solder mask svg
+** "Solder paste absolute clearance" -> -0.09mm
 * Configure Light burn to engrave at
-** 100mm/s at 30%
+** 100mm/s at 28%
 ** Line interval of 0.02mm
-It might also be a good idea to apply this globally since other pads also end up a bit large. This can be done:
+I like to soak a piece of paper in water and put it below the mylar. This helps reduce burning and warping
-* File -> Board Setup -> Solder Mask Paste
-* "Solder paste absolute clearance" -> -0.09mm