Breaking News
Comments
Newest First | Oldest First | Threaded View
<<   <   Page 10 / 11   >   >>
DrQuine
User Rank
CEO
Re: New faceplates for analog meters
DrQuine   8/22/2014 3:24:54 PM
NO RATINGS
@Max The Magnificent The new text was on several small spot labels that covered the old text. If you have access to an old lettering guide and a good fine point permanent pen that might also work well for small captions.

Max The Magnificent
User Rank
Blogger
Re: Meter Guts
Max The Magnificent   8/22/2014 2:58:43 PM
NO RATINGS
@mhrackin: Also, nearly all faceplates are symmetric; thus no need to scrape.  Just flip it over and paint!

Well, b##### me -- believe it or not, that had nerver struck me, and I'm starting the faceplate right in the ... well, face, actually :-)

Max The Magnificent
User Rank
Blogger
Re: Meter Guts
Max The Magnificent   8/22/2014 2:57:08 PM
NO RATINGS
@mhrackin: ...examining the photo of the disassembled meter, it has an internal shunt THAT CAN BE REMOVED. That would restore the basic movement range etc. so you can use it! 

HAPPY DANCE!!!

Max The Magnificent
User Rank
Blogger
Re: Realistic
Max The Magnificent   8/22/2014 2:55:45 PM
NO RATINGS
@Antedeluvian: ...or written with a typewriter with a rather grungy ribbon...

But where are we going to find a rather grungy ribbon at this time of the day LOL

Max The Magnificent
User Rank
Blogger
Re: New faceplates for analog meters
Max The Magnificent   8/22/2014 2:54:34 PM
NO RATINGS
@DrQuine: They were buying 0 - 20 ma gauges and then affixing new text on the meter faces for the application at hand.

Don;t keep me in suspense -- how was the new text presented? As sticky labels or as re-painted faces or...

 

antedeluvian
User Rank
Blogger
Re: Meter Guts
antedeluvian   8/22/2014 2:45:52 PM
NO RATINGS
mhrackin

(if you can find some India ink.....). 

I think I saw some in my drawer after I went rummaging after reading David Ashton's Slideshow: The Joy of Rotring

 

mhrackin
User Rank
CEO
Re: Meter Guts
mhrackin   8/22/2014 2:39:07 PM
NO RATINGS
Also, nearly all faceplates are symmetric; thus no need to scrape.  Just flip it over and paint!  I've used that trick many times.  If you have an old drafting tool/ pen set, the compass is terrific for draing the scale arc (if you can find some India ink.....).  I have a couple of sets (including one older than I am).

mhrackin
User Rank
CEO
Re: Meter Guts
mhrackin   8/22/2014 2:35:24 PM
NO RATINGS
PS: examining the photo of the disassembled meter, it has an internal shunt THAT CAN BE REMOVED. That would restore the basic movement range etc. so you can use it!  Same for "voltmeters" except the multiplier is often external; if it is internal, it's also easily removable.

mhrackin
User Rank
CEO
Meter Guts
mhrackin   8/22/2014 2:31:08 PM
NO RATINGS
ALL D'Arsonval (moving coil) meters are the best type, and the basic design is ALWAYS a DC current meter.  Many of these have a movement wiith a full-scale range of either 50uaDC (the expensive ones) or 1maDC.  These can be made to display other functions or ranges by connecting either a shunt resistor (for higher FS current) or series resistor (multiplier) to change to a DC voltmater.  For AC, the meter may be a moving-vane (e.g. Shurite type, usually relatively cheap) design which will work for AC or DC (although scale factor may be off), or uses a rectifier (typically bridge) along with a multipler or shunt.  VERY often, the shunt, multipler, and/or rectifier is EXTERNAL, so you CAN'T go by the faceplate in determining the meter configuration!  It's pretty easy to tell, thpough, with  a DC power supply, some resistors, and a multimeter.  Assume it's a "naked" DC milli/micro-ammeter, connect the PSU, a suitable current-limiting resistor, and the multimeter (in ammeter mode) in series and see what the meter does when the PSU is turned on.  Ther rest of the process (and how to calculate appropriate shunt/multiplier values) is left as an exercise for the student!

antedeluvian
User Rank
Blogger
Realistic
antedeluvian   8/22/2014 2:16:08 PM
NO RATINGS
Max

One thing I'd vaguely considered was to sand the faceplate down (using very fine sandpaper), spray-paint it white, and then add the new annotations by hand using a very fine indelible marker. But the more I think about this, the more I think the result would look absolutely horrible

But more realistically Victorian! In my blog Touring as an Engineer, I mention the Pitt-Rivers Museum where the labels on the exhibits are either handwritten or written with a typewriter with a rather grungy ribbon.

 

<<   <   Page 10 / 11   >   >>


EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
Max Maxfield

Steve Wozniak Reacts to Latest iPhone
Max Maxfield
9 comments
Funnily enough, just a few days ago as I pen these words, I was chatting with my wife (Gina the Gorgeous) when she informed me that -- as a kid -- she had never played at making a ...

EDN Staff

11 Summer Vacation Spots for Engineers
EDN Staff
20 comments
This collection of places from technology history, museums, and modern marvels is a roadmap for an engineering adventure that will take you around the world. Here are just a few spots ...

Glen Chenier

Engineers Solve Analog/Digital Problem, Invent Creative Expletives
Glen Chenier
15 comments
- An analog engineer and a digital engineer join forces, use their respective skills, and pull a few bunnies out of a hat to troubleshoot a system with which they are completely ...

Larry Desjardin

Engineers Should Study Finance: 5 Reasons Why
Larry Desjardin
46 comments
I'm a big proponent of engineers learning financial basics. Why? Because engineers are making decisions all the time, in multiple ways. Having a good financial understanding guides these ...

Flash Poll
Top Comments of the Week
Like Us on Facebook
EE Times on Twitter
EE Times Twitter Feed

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)