Hi Guys,

I have just purchased my first laser cutter 150w from China. (Reci laser Tube)

So far it seem excellent and im startign to learn the basics for cutting/engraving. I have a question about engraving though.

I have found that a good Power and Speed for some black anodised metal I have tested is about 'Speed 600 Power 25' . I have noticed though when going at about a power of 25% or higher when engraving the laser makes an occasional 'popping/arking' type noise for split seconds. Is this normal?

It seems to engrave fine, and when im going at much higher powers when cutting things it all seems fine. I just wanted to find out if the popping noise is something normal when engraving at a higher percentage and certain speed? It does not seem to happen at a power of 20% for example.

Any advice is much appreciated

Thanks.