RE: [CAD_CAM_EDM_DRO] Re: Keling - Laser Cutting/Engraving Machine

> I didn't find the Laser on his web site but on eBay and an exchange of email
> divulged that it was Keling. On another forum I learned that this paticular laser
> probably won't suit my needs due to the large laser kurf being roughly double
> that of the lasers that have cut my parts in the past, mechanical issues and
> software issues. Disappointing but better to learn before spending $800.

Kerf is mainly a wavelength issue. To get a smaller kerf you need to use a smaller wavelength, and that means getting a YAG laser, not CO2. YAG = $$$$$$.

It can also be caused by the lens used, basically the distance it focuses at affects the spot size and also the depth of field (aka depth of cut). An 'engraving' lens has a short focal length, say 20mm, this gives a small spot but is poor for cutting, a 'cutting' lens, say 100mm, is the opposite. The lasers usually come with one in the middle, around 50mm (actually 2").

The longer the focus the straighter the edges will be as well.

Material, power & cutting speed play a part too.

A new lens cost from $50.

CO2 laser kerf is usually around 0.1mm (YAG is half that), YMMV taking into account the above. Anyone claiming their CO2 laser has a smaller kerf than another CO2 laser is (mostly) full of it. Ask for samples.

It doesn't matter much anyway, you adjust for it in the drawing or the CAM (tool offset).

Tony