Full Version: Inside cylinder blasting/engraving

From: gt350ed [#10]
 19 Mar 2007
To: Larry (CELESTIALPROD) [#9] 19 Mar 2007

At least with any lasermask that I have used, the lasermask has an adhesive backing without a cover sheet. In order for it to be lasered and consequently turned into a mask for blasting/etching/carving, it must be applied to the substrate to be blasted, et al, AT THE TIME OF LASERING. So, your statement "use my laser" and "mount the mask inside the cylinder" is a non-starter.

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From: Dave Jones (DAVERJ) [#11]
 19 Mar 2007
To: Larry (CELESTIALPROD) [#9] 19 Mar 2007

Have you considered doing a slightly different scale that accounts for the diffraction of the glass cylinder and then etch the scale on the outside instead of the inside? Perhaps with some kind of overcoat for the weather?

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From: Larry (CELESTIALPROD) [#12]
 19 Mar 2007
To: Dave Jones (DAVERJ) [#11] 19 Mar 2007

>Have you considered doing a slightly different scale that accounts for the diffraction of the glass...

Yes, that is a possibility and I have done the mathematics to handle the refraction of the beam (somewhat complicated because of the angle if incidence changes with the change in elevation of the sun). There are two reasons the outside engraving is less desirable:
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1.) As the angle of incidence gets larger, the amount of reflected beam grows larger to the point where the sun spot image becomes lost in amient light.
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2.) Exterior engraving is subject to wear and tear in operating the instrument.

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