#SortIT, How to Measure CO2 Laser Focus Lens Focal Length and Diameter for Better Cutting

A Laser is a device that gives off a beam of light. When a laser is shot out of a laser tube in one direction it has an initial beam spot diameter. As the distance increases so does the diameter of the spot which is measured by the beams diversions angle. We need to use lenses to concentrate the laser power that will be used on the material.

Different lenses have different focal lengths and depths of field for cutting. A lens helps the laser to remain in focus in order to gain higher power on the focus point thereby cutting the material. The shorter the focal length, the shorter the depth of field will be. The effective cutting thickness will be less. On the other hand if the lenses focal length is long, the focused point will be further away. Less energy will be concentrated but the effective cutting depth will be long. Therefore making the cutting thickness greater.

Lenses have two parameters i.e. the diameter and focal length. Depending on the variation of your working projects, you will need a range of choices of both the diameter and the focal length.

*Here is a young demonstration on how you will go about removing the lens:*

You can use a ruler or a Vernier caliper to measure the diameter. Commonly used Diameters range between: 15, 18, 19, 20, 25 mm. You only have to get a reading closest to the above measurements due to the tolerance factor of both the lenses and the equipment.

Measuring the focal length is more difficult. You would have to use a torch light from right above and then place the lens between the torch light and the table, next to the ruler.

Now move the lens up and down until the spot of light is best focused.The reading on your ruler is the focal length.

Use readings closest to: 38.1, 50.8, 63.5 or 101.6 mm.

Once you have the diameter and the focal length you can contact our Sales Team on 060 600 6000/ 072 222 2211 for purchase or you can simply bring in your lenses to us even if they are cracked so that we can get those parameters for you.

http://sortit.co.za/video/387549258

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