Full Version: Reverse Engraving

From: logojohn [#21]
 17 Apr 2007
To: Harvey only (HARVEY-ONLY) [#20] 17 Apr 2007

quote:
Krylon paints do craze badly, voice of experience.


Is that only if you are trying to fill laser engraved letters with it.

I did some big pieces and just painted the whole back. One had holes for plates routed in the front and another I lasered through the paint and just left it frosted.

Is that going to be a crazing problem or just if you paint after it is lasered.

From: Harvey only (HARVEY-ONLY) [#22]
 17 Apr 2007
To: logojohn [#21] 17 Apr 2007

I tried it on lasered and rotary. The lasered was worse but one piece surprised me.

It crazed instantly, then over the next few hours got really bad, totally unusable. After redoing it and using acrylic paints, I looked at it again a few days later. Almost all of the crazing had healed as the solvents left. I know a lot of chemistry, but wish I did not have to keep getting lessons in the real world.

From: Boz (CHEDDARHEAD) [#23]
 17 Apr 2007
To: ALL

Brian, you might be able to reduce some of the lining in the bottom of your engraving by defocusing your beam. IF you move your engraving piece .060" to .080" out of true focus, you will be using a much larger beam to engrave into the plastic. You might have to increase power, or slow it down a touch, but it should help smooth out the bottom of the engraved piece.

From: Larry B (PALMETTO) [#24]
 18 Apr 2007
To: ALL

Is that a real word..crazed? I know what one meaning is..that's how I get sometimes...but how does it relate to paint? :-$

From: Harvey only (HARVEY-ONLY) [#25]
 18 Apr 2007
To: Larry B (PALMETTO) [#24] Unread

It is fine cracks that form along the edges of engraved letters. I have seen it go as large as 1/4".

From: Dave Jones (DAVERJ) [#26]
 18 Apr 2007
To: Larry B (PALMETTO) [#24] Unread

Main Entry: craze
Pronunciation: 'krAz
Function: verb
Inflected Form(s): crazed; craz·ing
Etymology: Middle English crasen to crush, craze, of Scandinavian origin; akin to Old Swedish krasa to crush

transitive verb
1 obsolete : BREAK, SHATTER
2 : to produce minute cracks on the surface or glaze of <crazed glass>
3 : to make insane or as if insane <crazed by pain and fear>

intransitive verb
1 archaic : SHATTER, BREAK
2 : to become insane
3 : to develop a mesh of fine cracks

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