You can draw things where the kerf will be wider than the space between nearby lines (especially with intricate artwork). Only if you want to see how cuts will interact with each other. InkScape is incredibly powerful, so to manipulate drawings, it’s worth some investment in tutorials like the ones at Inkscape Tutorials | Inkscape This lets you see the lines that the CNC will be trying to do something with. It is often helpful in InkScape to select something (usually using the arrow at the top of the right hand toolbar,) and remove its ‘Fill’ (double click on fill at lower left to get the dialog box.) If the thing disappears, go to the Stroke menu and give it some color. Boolean operations allow you to combine, subtract, break apart, get the difference, etc. The Paths menu offers a number of things you can do to and with paths, among them, ‘boolean’ operations.
Along with shapes like rectangles, circles, etc, they are objects. The lines/curves are also referred to as ‘paths’. If you want to get comfortable manipulating bezier curves, here’s an online game that will teach you: The curves have ‘control points’ which you can see by clicking on the arrow with 3 boxes (2nd from top on righthand vert toolbar.) These are typically ‘bezier’ curves. When you ‘trace’ a bitmap (raster image,) the result is a vector image (e.g. Vectors are ‘scale independent’, meaning that there is no resolution penalty for shrinking or enlarging them. Vectors are lines (curves,) that outline shapes. Photoshop/Gimp is a ‘raster’ (rows and columns of pixels,) as opposed to InkScape’s ‘vector’ model. The Photoshop/Gimp workfow is a difficult translation. If you can’t undo the union, it might be easier to just draw a box over the area with the letters and “difference” it away and start again. It’s a lot of work to fix something this way, but if you are still editing it, you can just undo the union of the letters and center them with the “align and distribute” tools. It will also break apart all of the other separate pieces of the design, so you will need to select them all and “combine” them to put it all back together. They will all be separate things, so you will have to “group” them to keep the letters together as one object. You have to go to Path and “break apart” to separate them again. The letters will not move because you “unioned” them and they are part of the whole piece now. Difference will cut it out of the larger design and leave a hole. Union adds to the design, so it will just become part of the larger piece and fill in.
If you want to add an eye, you need to “difference” not “union”. I’ve been using Inkscape for a while and I have no idea what he’s talking about with breaking curves apart.
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