LightBurn Tutorial 23 – Connecting a Name to an Ornament Using Union Tool

The LightBurn Software Series

The Lightburn Software is probably the best generic laser cutting software available (I use it for almost all of my laser work). This series has tutorials, hints and tips as well as the occasional speed comparisons between it and RDWorks. In this LightBurn Tutorial Session, we learn all about using the Union tool and the correct steps to take for the operation to work every time. My thanks to the team at Lightburn for allowing me to embed their videos.

Contents

A common mistake people make is trying to “Weld” a name to an ornament, causing the name to disappear. In this quick clip, is an explanation on how to use Boolean Union to do this, and show why weld (or union) can fail if the setup isn’t right.


How to Use the LightBurn Union Tool
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Lightburn Union Tool Example
Lightburn Union Tool Example

Transcript for How to Use the LightBurn Union Tool

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0:00i’m going to do a quick recap of how to

0:03use the boolean union feature in

0:05lightburn because this seems to be a

0:07significant stumbling block for people

0:09so i have an ornament

0:12and i have a name

0:14now

0:15in order to use boolean union

0:18you have to have two objects

0:21okay and in this case i have this object

0:23and this is a group and i have this

0:25object and this is also a group it is

0:28important that they are

0:30grouped together like this or it won’t

0:32work

0:33so i have this name and it’s touching

0:36the inside edge of this ornament shape i

0:38select the ornament and shift select the

0:40name in this case it doesn’t really

0:42matter what order i could just drag

0:44select them and then use boolean union

0:47and that will create a union of those

0:48two shapes so that now the name is fused

0:51in with the ornament

0:54what people

0:55most often do instead is they click weld

0:59and that is this button and their text

1:01disappears and the reason it does that

1:04is because

1:05weld

1:06doesn’t really look at

1:08this group

1:10and this group as two separate things

1:12it’s just kind of looking at all of the

1:13shapes that you gave it so it’s more

1:16like this one over here

1:18where this is not a group it’s just this

1:20circle and this circle and this name

1:24now if i take this inner ring

1:27and this text and i try to boolean union

1:30just this inside circle with the text

1:33the union of them throws the text away

1:36that’s not technically what’s happening

1:39what it’s actually doing is it’s

1:40creating the union

1:42of the two things that i fed it

1:45which are this circle and that text and

1:48if i say union those you can see that

1:51it’s keeping the overlap

1:54of both so the text

1:57and that circle and where they overlap

1:59it keeps or sorry where wherever either

2:02one exists

2:04it

2:06keeps it

2:08and so

2:11that’s basically what happens if you try

2:13to weld

2:16this shape

2:17with this

2:19uh with this ornament is lightburn says

2:21oh well they’re really only touching

2:23here so these are probably the ones that

2:25you want

2:26and it does the equivalent of a union

2:29there which is not what you were

2:31intending so

2:33if you grab

2:34the whole ornament make sure that it’s a

2:36group make sure that all the shapes are

2:38closed

2:39and the name

2:41select both

2:42and union that

2:44that will work

2:46as an alternative

2:48you can actually subtract

2:50this shape from just this shape and if

2:53you do that if i say take this shape and

2:57subtract this shape

2:59using the boolean difference tool

3:01it will also work because it’s now cut

3:04the text out of that inside ring which

3:07is very much the same as

3:10if you

3:11union the text with the entire ring

3:15hopefully that makes sense

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