as far as engraving and color filling better read this, but in short :
"As a rule of thumb, with characters up to 1/4" high, engrave to a depth of .010" -.012". On larger characters, it is advisable to go .015" - .020" deep depending on theline width and filling technique used."
Check your PM'sJohn S -
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Laser works best for engraving aluminium :-)
What size of laser do you need?
Mine is 10w, 1023nm, galvo. You can do it with a 6w blue fibre laser on an xy gantry home made. Size is not really the issue, beam quality is more important..
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