In this video I’ll check focus of laser using the Ramp Test Method and then find optimal cut power and speed settings for 3mm MDF, checking whether the focus tool sent with the machine is accurate. How to check your CO2 laser focus is correct.
By using optimal power settings it will reduce over burn of the material. The benefit if this will be to only use the power required for a job which will extend the life of the laser.
Laser Cutting Resources - [ Ссылка ]

Lightobject LSR-EP4 CO2 Laser Eyes Protection Glasses/Goggle, 10600 nanometer - [ Ссылка ]

I’ve noticed that when I cut 3mm MDF in my projects sometimes it does not cut completely through, even after focusing the laser with this tool that came with the laser machine.
So I want to find out if this piece is accurately focusing the laser and if not what is the correct focus gap for my machine. I’m using a Chinese Laser 80W (x700)

If I want to produce pieces quicker then determining the power to speed settings, I’ll be able to determine the power increase required when the laser head is moving faster.

This is the method I use is this:

1) Create a series of straight lines all with different power settings starting at 10% through to 80% at 15mm/sec (Then repeat with the same lines at 25mm/sec)

2) Position the work piece on an angle to the laser bed so that the laser will move from out of focus then into focus and out of focus again.

3) Complete the cuts and examine the work piece to determine which cut is the best for this material and mark it on the work piece.

4) Re-position the work piece back into the laser at the same position used when performing the cuts.

5) Move the laser head over the marked positions and measure the distance between the laser head and the work piece. (This will be the test focus distance)

6) Position a new work piece in the laser and set the focus gap with the new measurement.

7) Create new shapes a circle/oval and square to cut at the chosen power and speed settings and commence the cuts.

8) Examine the pieces to determine efficiency of the new settings for this material.

9) This process can be repeated at different speeds for the same material or another material for example 6mm MDF or 3mm Acrylic sheet.

I hope you found this experiment informative, and helps you with your laser projects.
If you have any comments you’d like to make about the process I used and if there may be a better way to do things please leave them below, hopefully they can help me and others also.

Until next time take care.
Cheers Matthew

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