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Question of dials
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Author:  Doctor Diesel [ Thu May 08, 2008 3:18 pm ]
Post subject:  Question of dials
can someone in the know explain a bit about the sandwich and non-sandwich dials to me

personally I think the sandwich ones look nicest but what are the tech differences etc?
Author:  sportback [ Thu May 08, 2008 4:08 pm ]
Post subject:  Re: Question of dials
There are two basic principles here - the painted dials, where the luminous material is applied to the surface of the dial, and the 'sandwich' dials where the numbers and minute markers are cut out of the metal plate which forms the visible dial (behind the crystal). Behind this is a second metal plate with recessed areas where a thick luminous paste is applied - the areas corresponding to the cut-outs in the first metal plate - thus 'sandwiching' the luminous material between the two metal plates.

Does this help?

Take a look in the gallery section where I've posted an example.
Author:  paneraisource [ Thu May 08, 2008 4:27 pm ]
Post subject:  Re: Question of dials
Hmm.. maybe you can help me re-write the glossary defination that I made for Sandwich dial, sporty lol :D
Author:  sportback [ Thu May 08, 2008 4:41 pm ]
Post subject:  Re: Question of dials
I saw that but I didn't want to be too picky :roll:
Author:  alien13 [ Thu May 08, 2008 5:13 pm ]
Post subject:  Re: Question of dials
and does this make the sandwich type more luminous?
Author:  sportback [ Thu May 08, 2008 6:31 pm ]
Post subject:  Re: Question of dials
I personally think so - but I don't have a sufficiently accurate light-meter to test this!

This is a sandwich dial after approximately 10 seconds exposure to a halogen lamp...

Image

I find I can read the dial perfectly easily even after several hours in the dark, provided I leave it to 'charge' up under my bedside lamp for a few minutes before going to sleep.
Author:  Driver8 [ Thu May 08, 2008 7:24 pm ]
Post subject:  Re: Question of dials
sportback wrote:
There are two basic principles here - the painted dials, where the luminous material is applied to the surface of the dial, and the 'sandwich' dials where the numbers and minute markers are cut out of the metal plate which forms the visible dial (behind the crystal). Behind this is a second metal plate with recessed areas where a thick luminous paste is applied - the areas corresponding to the cut-outs in the first metal plate - thus 'sandwiching' the luminous material between the two metal plates.

Does this help?

Take a look in the gallery section where I've posted an example.


I always thought it was a top layer of metal with the numerals cut out (so far so good) with a plate of luminous material (plastic or something) sandwiched below it, with another plate of metal below that! Shows I really do know nothing about Pannies! :oops:
Author:  sportback [ Thu May 08, 2008 7:40 pm ]
Post subject:  Re: Question of dials
You are right - but I'm led to believe that there are in fact two methods of 'doing' the sandwich - from the photos I've seen there's a honking great slab of luminous material between two metal plates - but I've also seen the system I've described. I was simply trying to give an idea of how it works.
Author:  Driver8 [ Thu May 08, 2008 7:45 pm ]
Post subject:  Re: Question of dials
Driver8 wrote:
I always thought it was a top layer of metal with the numerals cut out (so far so good) with a plate of luminous material (plastic or something) sandwiched below it, with another plate of metal below that! Shows I really do no nothing about Pannies! :oops:


Oops, it appears I also "no" (sic) nothing about spelling either! :lol:
Author:  alien13 [ Fri May 09, 2008 8:07 am ]
Post subject:  Re: Question of dials
with the looks of the photo i would bluntly say that indeed it is more brilliant and luminous. but then again this is subjective
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