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Shadow Meter Question - Printable Version

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Shadow Meter Question - Radioroslyn - 06-27-2016

Was reading some posts about the shadow meter and was inspired to pull the one on the 660 off. Got it off ok but don't quite see how to get the vane and it's pivot plate out with damaging it so I can mount it on a spindle. It also looks like there are 5 dinky brass tabs at the back of it (where the wires are solder on) and I'm guessing that I pry those up to gain access to the backside of the coil. Dang it's got a LOT of wire on it!!!!

Terry

RE: Shadow Meter Question - morzh - 06-27-2016

The brave soul art thou.

RE: Shadow Meter Question - Radioroslyn - 06-27-2016

Didn't you have one rewound a while back??

Terry

RE: Shadow Meter Question - morzh - 06-28-2016

I did. But I sent it to Alabama to be rewound. I have no patience for such things as rewinding a few thousand turns with #40 wire.

RE: Shadow Meter Question - Stan the Man - 06-30-2016

Yeah,.. No,.. Yeah ,.. No,..

RE: Shadow Meter Question - quartermilecamel - 07-03-2016

rewinding one is quite easy!!!  If I can do it so can you.  I did not remove the triangle shaped sheetmetal.  Take a measurement of the opening of the vane viewing area(the triangle looking horn), it should be 1/2 inch or so.  All I did was find a bolt head that was slightly larger than the triangle horn looking part of the meter.  Pushed the bolt in between the metal sides of the viewing area, then zip tied the bolt with washer and nut on securely.. With a washer and nut tight against the head of the bolt, the washer will stop the bolt from going too far inside the horn.  I could then insert the threaded end of the bolt into a drill.  My drill wasn't variable so I used a variac for speed.....very easy to do. 
  I have the later style shadow meter on the 37-630.  which has the triangle horn on it.  If thats the earlier style just fit  that round ridge next to the vane inside a pipe.  Then mount pipe to a drill.  I bought 8000 feet of wire and used a spool dowel that just fit perfectly in the spools hole.

RE: Shadow Meter Question - Radioroslyn - 07-04-2016

So I'm assuming that you have to remove the phonalic wafer from the back side of the coil. It looks like it's held on by 5 little brass tabs. Mine are sort of inbeded into the wafer. Was thinking that it might be easier to grind them down a bit and use a little glue at reassembly.
So you didn't take any parts from center of the coil? Like the vane and such? If you didn't what good did the washer do as you couldn't put the bolt though center of the coil? I'm missing something.

Tnx!
Terry

RE: Shadow Meter Question - KCMike - 07-04-2016

(04-08-2016, 05:45 PM)KCMike Wrote:   Here is some pics of an old one I have. I took pic. of it and looked like yours with shiny end of vane.
https://www.dropbox.com/s/j95dsbq1n6scy11/DSC00978.JPG?dl=0
  I figured nothing to lose and decided to see if I could remove it.
https://www.dropbox.com/s/9mxb0to3lcnsm2h/DSC00979.JPG?dl=0
 After carefully bending back the four tabs on the back I pulled it apart.
https://www.dropbox.com/s/zmqylmrb6lqxj19/DSC00981.JPG?dl=0
 Here is what it looks like after removal.
https://www.dropbox.com/s/10gb5ucm2l6enke/DSC00984.JPG?dl=0

https://www.dropbox.com/s/ybqic8wtckup01y/DSC00982.JPG?dl=0

https://www.dropbox.com/s/exvbyk2ewd21na8/DSC00983.JPG?dl=0

 You might want to try this to get a better look at yours. If you do don't get mad at me if it breaks Icon_e_surprised Icon_biggrin  Good luck.
  I don't know if this will help but thought you might take a look.


RE: Shadow Meter Question - Radioroslyn - 07-04-2016

Hey Mike,
Tnx for the pics. I've kinda put it on the back burner till I get this confounded chassis working. I did find another shadow meter from a 116x set I've got. It's a different style it has flat electromagnet. The coil is good but don't get much deflection. Something else to figure out.

Terry