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If you want to laser engrave the bottom of a bowl, or vase, or goblet or whatever, and you want the engraving centered, here’s a way I do that at the TechShop,http://www.techshop.ws.

Take note: The events described in this Instructable took place on an Epilog 60 watt Laser Engraver on an olive wood bowl. Power settings and speeds will probably be different for your situation, so practice on test pieces before committing something you value.

Step 1:

Picture of
Start by measuring the bottom diameter.
 
togo19192 years ago

I think an Instructables Monster has been created...

;)