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Step 3A few more details
A few details now.
Grommets must be used where the wires cross the metallic plane so as the plastic insulator of the
electric wire does not wear out against the metal plane.
The fuse must be rated for the lamps used. In my case 3x8W 220Vac require a 0.5A fuse.
The tubes, ballasts and starters must be rated togheter. Too high rated the ballast and the tubes
get burnt, too low rated and the ballasts burn. Ballasts are typically rated with ranges e.g. 4-20W.
With different wiring and rating one ballast can serve two tubes. Check with the ballast supplier.
As a second thought, I think I shouldn't have removed the scanner's head. I should have mounted one single tube to the moving head of the scanner and use the stepper motor and belt to move the head back and forth.
To provide a uniform lighting the head should have been moved with a non-uniform speed (arcsinusoidal, or inverse sin function, I am guessing). Exposure time would be given by the head-lamp scanning faster or slower as required. But that's another story
One final important notice: UVs are dangerous to the eyes, so do not stare at the tubes when lit.
Ciao
Grommets must be used where the wires cross the metallic plane so as the plastic insulator of the
electric wire does not wear out against the metal plane.
The fuse must be rated for the lamps used. In my case 3x8W 220Vac require a 0.5A fuse.
The tubes, ballasts and starters must be rated togheter. Too high rated the ballast and the tubes
get burnt, too low rated and the ballasts burn. Ballasts are typically rated with ranges e.g. 4-20W.
With different wiring and rating one ballast can serve two tubes. Check with the ballast supplier.
As a second thought, I think I shouldn't have removed the scanner's head. I should have mounted one single tube to the moving head of the scanner and use the stepper motor and belt to move the head back and forth.
To provide a uniform lighting the head should have been moved with a non-uniform speed (arcsinusoidal, or inverse sin function, I am guessing). Exposure time would be given by the head-lamp scanning faster or slower as required. But that's another story
One final important notice: UVs are dangerous to the eyes, so do not stare at the tubes when lit.
Ciao
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Jan 29, 2008. 9:29 AMjimwig
says:
labtech you did think of it. sometimes you just feel as if you were there when the project became reality. eh? ideas float in the air and when someone moves on making one we all benefit or not. a connectiveness of sorts.
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Nov 9, 2007. 2:03 AMlabtech1952
says:
Great project. The only criticism I have is; Why didn't I think of this?
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