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Old 20th Sep 2022, 7:25 am   #1
FIXITNOW
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Talking Recreating meter scales.

got this Regeltrafo variac from kings Lynn radio rally all seems to work , but the meter scales have badly flaked, has anyone any meter scans that i could adapt, or some easy to use software (the volt one has already been apart and had clear tape added)

or are really bored and need something to do
jpegs and pdf scans if anyone can help thanks Vince
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Old 20th Sep 2022, 8:17 am   #2
GMB
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Default Re: Recreating meter scales.

Those images would not be hard to manually clean up so they could then be printed again nicely. What I have also done is to measure scales up and then generate a new scale using PostScript code - but a bit hard for moving iron.

The problem is then what to use for a new scale. I have printed colour scales on paper and then laminated it to make it stiffer but the problem there is that the ink will probably fade. Black printing from a laser printer should fare better.

If you want to go the image manual cleanup route then a critical starting point is to avoid JPEG compression - which your images both failed to do. You need an accurate scan at as high a resolution as you can get and using a non-JPEG compression method e.g. PNG (your scales do not need colour).
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Old 20th Sep 2022, 8:26 am   #3
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Default Re: Recreating meter scales.

have done these png versions so added
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Old 20th Sep 2022, 11:33 am   #4
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Default Re: Recreating meter scales.

Yes, but not very high resolution. To get a good result you need to scan it at the resolution you intend to print it - and using greyscale will save a lot of file size.

What are the real world dimensions?
Do you have a suitable printer or are you hoping someone will do it for you?

Edit: Looking closely at it I would say your PNG file is a JPEG that has been written in PNG format - which is not useful.

PM me if you want me to actually do some of this.
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Old 20th Sep 2022, 11:44 am   #5
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Default Re: Recreating meter scales.

they are 58mm square i am using the printer/scanner at work which is sadly stuck at turning the scans into pdf ,i did the pdf at 400 i could set it to max 600 but it would still be a pdf . to print we have laser printers here at work and i was going to print to stick back parcel label paper

this is a subject i know little about
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Old 20th Sep 2022, 12:00 pm   #6
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Default Re: Recreating meter scales.

No it didn't.
Firstly, PDF is not an image format so an image in PDF can be anything.

If my maths is correct then your JPG file is 200dpi and the PNG file is 300dpi.
I would have gone for 600dpi.

Your PDF image data is 300dpi too.

My "drawing it from scratch" method works OK with any old starting point but is more fiddly and the result is not usually exactly in the same style as the original - but has no resolution so can be scaled without limit.

One thing I forgot to mention is that the paper used for the final printout needs to be the best quality you can find. Crappy paper can turn brown in surprisingly short time.

(Document and image processing is/was my business)
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Old 20th Sep 2022, 12:24 pm   #7
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Default Re: Recreating meter scales.

ok will do a scan at 600 , saved as a pdf (as it my only option) and add here as soon as i can

thanks for your on going help in my education
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Old 20th Sep 2022, 12:33 pm   #8
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Default Re: Recreating meter scales.

scan at 600
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Old 20th Sep 2022, 12:33 pm   #9
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Default Re: Recreating meter scales.

A few other users have found this useful :

https://www.blocklayer.com/gauge-templates.aspx
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Old 20th Sep 2022, 1:11 pm   #10
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Default Re: Recreating meter scales.

I forgot to mention that your PDF's are using JPEG compression, but it is actually 600dpi so a great improvement.

For doing the drawing it again method it helps to know where the pivot point is as it may not be in the centre of the obvious curcle. Clearly you have non-linear scales which does make that method a lot harder!

The raster method needs you to make an image of it (not JPEG) and as greyscale and then clean it up with a paintbox. Deadly warning: you might want to turn CLEARTYPE mode off on your PC (if it is windows) and make sure it stays as greyscale as the Windows paintbox has an annoying habit of changing the colour model and setting it up for a bad result.

Cleartype makes an image silly for anything other than screen viewing on the PC that wrote it. Just one of the many little hazards along the way.
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Old 20th Sep 2022, 1:30 pm   #11
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Default Re: Recreating meter scales.

The pivot point is centre of the larger hole which is 11.9mm diameter
the smaller hole off the 2 is where the adjuster pokes through to set the needle to the zero mark
the 2 darker holes are the needle end stops and are little clear plastic pegs
the last 2 holes top right and bottom left are for the scale fixing screws
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Old 21st Sep 2022, 12:01 am   #12
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Default Re: Recreating meter scales.

Blocklayer looks very interesting. Some other meter software that's been around a long time is MeterBasic which is the free version of another program.
MeterBasic may be adequate for very simple stuff.

I have sometimes photographed meter plates, then imported the bitmap image into Lotus Freelance (similar to PowerPoint) and then drawn a new plate over the top of the bitmap, moved the bitmap to one side and printed off the remaining drawing. If done with care, results can be quite good.

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Old 21st Sep 2022, 4:53 am   #13
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Default Re: Recreating meter scales.

I've been playing with Blocklayer. In many ways, it is easier to use than MeterBasic.

Here is a scale of 0-6 which would be about right for a meter on a VCM163.

B
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Old 22nd Sep 2022, 2:47 pm   #14
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Default Re: Recreating meter scales.

Here is what some simple graphic reprocessing gets you for A without spending too much time on it. I haven't tried printing it but it does depend on the printer.

NB: Make sure you print it "actual size" as the defaults are often to scale to fit which will change it because most printers are not edge-to-edge.
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Old 22nd Sep 2022, 2:54 pm   #15
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Default Re: Recreating meter scales.

Quote:
Originally Posted by GMB View Post
Here is what some simple graphic reprocessing gets you for A without spending too much time on it. I haven't tried printing it but it does depend on the printer.

NB: Make sure you print it "actual size" as the defaults are often to scale to fit which will change it because most printers are not edge-to-edge.
Awesome job that's perfect many thanks for your help with these
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Old 22nd Sep 2022, 4:22 pm   #16
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Default Re: Recreating meter scales.

I will do the other soon. It's a nice brain-dead job to do with covid. You can tell my brain is dead because that one is the V meter.
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Old 22nd Sep 2022, 6:16 pm   #17
FIXITNOW
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Default Re: Recreating meter scales.

Quote:
Originally Posted by GMB View Post
I will do the other soon. It's a nice brain-dead job to do with covid. You can tell my brain is dead because that one is the V meter.
no fuss no rush, appreciate you help all the best Vince
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Old 22nd Sep 2022, 8:15 pm   #18
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Default Re: Recreating meter scales.

As I have mentioned on various other threads on this forum on meter scales, I would suggest at look at Galva. (http://www.f5bu.fr/galva-about/). I have done really complex multiple log meter scale recreation on this package with great success. And it’s free!
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Old 23rd Sep 2022, 9:32 am   #19
Bazz4CQJ
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Default Re: Recreating meter scales.

I've just tried downloading galva, but it says that the file richtx32.ocx is missing, so won't run. Haven't spent much time on it, will look at it later.
Any advice?

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Old 23rd Sep 2022, 6:00 pm   #20
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Default Re: Recreating meter scales.

Quote:
Originally Posted by Bazz4CQJ View Post
I've just tried downloading galva, but it says that the file richtx32.ocx is missing, so won't run. Haven't spent much time on it, will look at it later.
Any advice?

B
My copy of Galva was downloaded a while back. The author is very helpful and answers emails quickly so maybe drop him a line?
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