Laser cut art - 'forgery'

(ian) #1

I was blown away with some laser cut art work I saw the other day and had to try it myself. I don’t have a laser cutter but I can mock up the designs in 3D.

The simplest work was expanding and contracting circles arranged radially with lines around the edge. The trickiest part where some curved points in the outer group of circles.

OpenSCAD was use to do the modelling. Less well known than its 3D abilities, OpenSCAD has 2D shapes, 2D binary operations, and once the model is compiled can export to dfx, or svg files.

The circles and lines are the normal scad primitives, but the pointy curves are polygons generated from Bezier curves.

	public static Vector2 CalculateBezierPoint(double t, Vector2 p0, Vector2 p1, Vector2 p2, Vector2 p3)
		double u = 1 - t;
		double tt = t * t;
		double uu = u * u;
		double uuu = uu * u;
		double ttt = tt * t;

		Vector2 p = uuu * p0; //first term
		p += 3 * uu * t * p1; //second term
		p += 3 * u * tt * p2; //third term
		p += ttt * p3; //fourth term

		return p;

Function to generate the Bezier values

Copy of design remade in OpenSCAD

The original can be viewed here

Layers to cut

Files available here

(Derryn Harvie) #2

Looks awesome, what thickness is each layer?

(ian) #3

and the whole thing is 250mm in the XY directions.

(ian) #4

I wasn’t sure, do laser cutters work with dxf files?

(David Lyon) #5

I just bought a small laser-cutter last week.

The one that I have is based on GRBL .

There is a program called “Laser GRBL” on github

Because they use G-Code, you will need to convert the DXF into G-Code before sending it to the Laser-Cutter.

(Derryn Harvie) #6

The Chinese one I have can import either dxf or Adobe AI files. The job is then setup in the laser software (cut speeds, power, etc) and finally sent to the laser.

I’ll cut it and bring it in.

(ian) #7

That would be so cool!!!

(ian) #8

A big thank you to @Harvs for cutting this out.

Pieces to assemble

Finished peice

(Jamie Reid) #9

Looks fantastic!

(David Lyon) #10

Nice. How powerful is the laser on that? and what type of material ?

(Chris Small) #11

Very nice! I’ve not encountered that software before - it looks pretty cool.

(Chris Small) #12

I saw a couple of MHV projects relating to CNC routers and the like. A 400nm laser out of an X-box in conjunction with a CNC X-Y stage might provide for an interesting and relatively low cost experimental setup for laser etching.