Folder Glass Etching/ SandblastingInside cylinder blasting/engraving


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 From:  gt350ed
 To:  Larry (CELESTIALPROD) 
6351.10 In reply to 6351.9 
quote:
2. Use my laser to create a sandblast mask of the sundial hour lines and points. Mount the mask inside the cylinder and then deep carve (say 0.005 inch) those lines and points on the inside surface.


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.

Ed Holley
Victor Valley Trophy & Awards Co.
and Coffee Mugs Online
www.coffeemugsonline.com

 

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 From:  Dave Jones (DAVERJ)
 To:  Larry (CELESTIALPROD) 
6351.11 In reply to 6351.9 
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)
 To:  Dave Jones (DAVERJ) 
6351.12 In reply to 6351.11 

>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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