Galvoscanner project part 1

My laser cutter is now cutting, thanks to all the improvements I made (head, power bed, power supply, controller, …).

Now I want to add a galvoscanner to my laser cutter head to raster IC for DIE inspection, galvo motor are expensive and because many people build them from almost anything with a coil (speaker, fan, hard-drive, etc.) I decided to also built one by myself !

I used FreeCAD (0.15) to drawn all parts and also check if the assembly will work, here is a partial assembly of my experimental galvo bench:3Dassy

I design two coil holders disposed at 135°, in this configuration I’m supposed to be able to rotate the mirror from 0° to 45°, keep in mind it’s for experimentation so the travel angle is large to see any influence of magnetic field variation.

All parts were exported to DXF files and then assembled with QCAD, thanks to QCAD customizable CAM export for generating GCODE compatible with smoothieboard.

Here is the result of the laser cutting:

3mm thick plexiglas (or supposed to be because it smell a bit like chlore when cutting), with 300mm/mn and 6~7mA and laser focus 1mm underside the top surface. Only one pass was necessary and the result is great !

Here is the assembled experimental bench:
DSC_0973 DSC_0972

Of cour coils are missing, this is for the next step, keep in touch ! K40 18mm Laser head w/ air assisted

You just bought a K40 chinese laser cutter ? Unfortunately it’s merely impossible to cut anything with the stock laser head because of the fume spreading the laser beam and stain the less reducing the power.

Here is the solution, made this nice laser head:

Delivered without the lens because stock lens doesn’t fit with. This new laser head is made for 18mm lens, stock mirror can be reused (same size).

Here are all the parts, assembly is easy and fast:DSC_0860

I also ordered a standard 18mm lens:

Overview of all the parts:

As said, assembly is easy and fast:

Combined with the power-table I can now cut almost anything ! No more dirty lens !DSC_0899DSC_0900 Power table/ bed kit for K40 small laser machine


I bought a 40W CO² laser from ebay but wasn’t satisfied with for many reason, one of them was the bed, stock bed cannot be lowered even manually. I was also looking for a new laser head with air-assist when I found this power table/bed. sell a lot of parts for laser and CNC and today I will talk about this nice product through a step-by-step assembly, here is all delivered parts:

Frames and bed
Belt tensionner, axis and screw
Belt tensionner, axis and screw
Pulley and z-axis
Pulley and threaded-rod (with bearing)
Belt and stepper motor
Belt and stepper motor

Let’s start the assembly with the lower frame and the four threaded-rod, simply insert the bearing in the frame:

Insert the four axis:

Remove the bearing and the upper lock nut:DSC_0876DSC_0875

Turn all the four nut:

Pre-install the belt and the stepper:

Fasten the stepper with the two screw:

Install the belt-tensioner, with light tension as long as the assembly isn’t done:DSC_0881

Install the bed (and the lock nut):

We removed the bearing from threaded rod, now it’s time to install them in the upper frame by gently pushing them in the blind hole, if it’s hard to insert try another bearing/blind-hole combinaison, never use a hammer !

The upper frame can now take place, don’t forget the previously removed lock nut. Simply insert the threaded rod in the bearing:

Fasten the upper frame with screw:

Almost done, you can now adjust the belt tensioner:DSC_0891

Flip the power-table upside down:

The lock nut is in contact with the upper frame and the bed lay on the four lock nut, it’s now time to lock them all:

And it’s done !

A pleasant hour long is required for the assembly but if you don’t take photography it’s done in less a half-hour !

Here is my power-table in place in my K40 CO² laser (I painted it white because the stock blue color give me cancer !)