Fiber laser engraving a quarter 

You can cut all the way through with enough time!

Really just depends on how much material you can remove per pass. No way to control depth other than time/passes. Once you get to the depth you need you can rerun based on time and get pretty close each time.

@@seasidemetaldesign1472 Does this mean that you can't achieve 3d relief with one laser run and will need to send different commands several times?

All trial and error really!

If your hand's not at the focal point, with a 50-100 watt 1064 nm laser you'll just feel a little bit of warmth on your hand. If it's at the focal point, you're going to get burned, but nowhere near as badly as a CO2 (10600 nm) will because your skin reflects most light at 1064 nm, but absorbs most 10600 nm light.

Normal fiat coin, although there are blanks out there for sale

Through @DebinLee on facebook

laser can not color engraving on aluminum but stainless steel

Currently using a 300x300

100 freq, 1500speed. 100 power

All depends on how deep you are trying to go. Settings will vary as well, and focus needs to be adjusted as the material is lasered away

​@@seasidemetal9834does 3d dynamic focus laser solve this problem?

After several passes it ends up being a 3d relief.

@@seasidemetaldesign1472 Thanks for posting this. How can this be a 3d relief after a few passes? Is that because the tree branches are very thin and the edge melts slight so that it looks like a 3d? Or is this a 3d dynamic laser machine? Thanks!

This one sold for $30 if I remember correctly

Select Continuous option.

So far it's been a fun toy but as we progress with it I'll be more comfortable in marking on expensive items such as those!

@@seasidemetaldesign1472 Thank you for your reply. Could A 20watt fiber lasser(those expesive) make the job on gold, silver? Or I need at least 50watt?

@@svsv9 sure, although if you are engraving into the metal it will be slower.

High Frequency and low power