Why do my engravings come out like this?

[NotoriousCrafter]

Hello Lighters.

Can someone help me figure out why the edges of my letters and such are having this sorta overspill?

Using Ortur Laser Master 3 with their 20W laser.

Using 4000 speed and 100% power.

My wood engravings nor glass engravings don’t have this issue, it’s more so of engraving on steel and anodized aluminum.

I’m really lost. Anyone have this issue before and if so, what was your remedy?

Thanks

[misken (Melvin)]

Looks like you didn’t use the recommended parameters for tumblers. You always need to scan ALONG the object. The object should not turn during movement and only do minimal steps. Scan along the x-axis. 4000 speed also sounds much too fast for a rotary.
If you use the same settings on glass, I think the reason you don’t see it there is that results on glass are not that “sharp” as on anodized aluminum, where you can go down to the actual beam width.

[cggorman (Chris)]

This job set up as two layers or a main layer + sublayer? It looks to me like the fill was done as a normal scan and then an outline was performed where the outline is probably too fast for the rotary.

[NotoriousCrafter]

Thanks for the responses.

I am pretty new to laser engraving and cutting so I’m
Not sure how to scan “along”

And I’ve tested a few speeds and power settings.

4000 gives me the best look but I will play around with decreasing speed and power.

Can anyone suggest where I can find these settings? And the chuck rotates.

Using Ortur YRC rotary chuck

[misken (Melvin)]

On a chuck it is different, slippage is not a problem here, so you also can scan along the y-axis. Here are some pictures of what I meant: Rotary roller - Diode Laser Wiki