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tom-ii
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Laser engraving
tom-ii   8/25/2014 2:41:40 PM
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Max,


You might take a look at these folks:  http://www.mandrelbend.com/

 

They are actually an exhaust shop just down the road from my house.  BUT - they have a laser engraving machine on-site to do custom work for the "tuner" community.


You might give them a ring and see what they might be willing to do..

 

It might actually be that these folks are in the same building, but one or the other can get you good contact info.

http://www.manta.com/c/mwk15xy/chesapeake-laser-engraving

Rcurl
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Rookie
Re: New faceplates for analog meters
Rcurl   8/25/2014 2:22:00 PM
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If the background of the scale is still nice and white then you can get some correction fluid like "wite out" or "Snopaque" and cover just the numbers and letters but not the scale markings.  Then use Letraset dry-transfer lettering to replace the letters and digits. You can get it on eBay and at many craft stores in the scrapbooking section.

If you decide to re-print the scale markings and everything, you might try getting an inkjet printer that will print on CD's. You could easily modify it to accept the meter scales.

mhrackin
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CEO
I forgot to mention earlier....
mhrackin   8/25/2014 12:12:59 PM
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The meter in the photographs was made by Weston Instruments, likely in the late 1950's, in New Jersey.  I grew up there, and got my BSEE from Newark College of Engineering (now part of NJIT).  Edward Weston was a major benefactor of the college; the main building was Weston Hall (which may actually have been the original home of Weston's company). That is almost certainly a moving-coil movement; I don't think Weston made moving-iron, as their meters were high-end and high quality.  I probably have a couple in my basement (bought surplus in the '50s or '60s).

mhrackin
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CEO
Re: New faceplates for analog meters
mhrackin   8/25/2014 12:02:14 PM
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As a former South Floridian who routinely went wading in the Everglades on fishing trips, this advice:  Alligators are fine, unless it's a momma guarding the underground nest.   Otherwise they don't bother you if you don't bother them.  Watch out for the crocodiles, though; THEY are NASTY (as are the water snakes).

Max The Magnificent
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Re: New faceplates for analog meters
Max The Magnificent   8/25/2014 10:06:57 AM
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@JGrubbs: Max: If you are going to print the faceplates for the meters take a look at "Meter" and "BasicMeter" software from Tonne Software. BasicMeter is free and Meter is $35. You can download the manual from their website.

Hi there -- I just checked into the hotel in Sao Paulo for ESC Brazil -- I'm up to my armpits in alligators at the moment -- but I will look at these apps as soon as I get a free moment.

David Ashton
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Re: AC meters
David Ashton   8/25/2014 1:22:52 AM
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@traneus ... " it dissipates 4 watts at fullscale deflection"

Sounds about right.  We use cheap moving iron meters for battery monitors in our radio sites.  The voltmeters are 15V fsd and run around 12-14V all the time.  The bare meter sensitivity is around 2-3V I think, so they have a high wattage multiplier resistor built in.   After a few years of service the plastic faceplates go brown because of being in proximity to the hot resistor for so long.  BUT I've never yet seen one go wrong!

PS - keep your meter under lock and key, Max'll be after it for his projects!!

traneus
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Rookie
Re: AC meters
traneus   8/24/2014 9:03:00 PM
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David Ashton, you are correct.

I have a moving-magnet center-zero DC meter made probably before 1920, likely before 1900. The meter has three terminals connected to two windings (one terminal is common to both windings): a low-resistance, few-turns winding for current measurement, and a high-resistance, many-turns winding for voltage measurement. The meter is so insensitive that it dissipates 4 watts at fullscale deflection! The voltage winding measures 30 ohms, and gives fullscale deflection at 11 volts DC. Perusing an electrical-equipment textbook copyright 1891, showed this was reasonable at that time.

JGrubbs
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Rookie
Re: New faceplates for analog meters
JGrubbs   8/24/2014 8:38:35 PM
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Max: If you are going to print the faceplates for the meters take a look at "Meter" and "BasicMeter" software from Tonne Software. BasicMeter is free and Meter is $35. You can download the manual from their website. 

 

 

Max The Magnificent
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Re: AC meters
Max The Magnificent   8/24/2014 10:53:22 AM
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@traneus: While you have the scale plate off, check the internal wiring of the meter. Many AC meters are actually rectifier-driver DC meters.

I'm currently sitting in Atlanta airport waighting for my flight to ESC Brasil ... but when I get back I will be taking a much closer look at what's inside thise little AC rascals :-)

Max The Magnificent
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Re: AC meters
Max The Magnificent   8/24/2014 10:51:36 AM
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@David: ...but only if the basic meter movement is of the moving-coil type.  If it is moving iron...

There's always something new to learn...

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