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About a year ago I posted a thread re this accessory which needed a lot of TLC to make operable.

The most functional of the problems was the condition of the solenoid coil...

IMG_0310

...clearly having most of its original coils missing.   I experimented adding additional coils of the #28awg enameled wire, but could never achieve success.

Fast forward...   We came across another #80 semaphore with an intact coil...

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I can simply swap this part to (hopefully) make the original otherwise-restored semaphore to functionality.   Of course, that still leaves the second semaphore DOA.

Rather, my question du jour is...What do I need...material and measurements...to replicate the solenoid having the complete one in hand?

I measured the resistance of the coil...about 6.7 ohms.   But, how does that relate to how many windings I should apply?

I notice, also, that the intact solenoid has a paper layer between each layer of windings.  What is this paper?  Special or fairly common?  Where to find?

Of course, I can make some dimensional measurements for comparison of the parts in hand, but I'm not sure whether that's really useful in determining the number of windings.

I know, I know...Make the swap.   Get one good functional, cosmetically decent semaphore.  Sell the other for 'parts'.   

I may end up doing that.  But for now, call it...'scratching the itch'.

Any help greatly appreciated.

KD

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Last edited by dkdkrd
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Well, that part's pretty easy....100 feet.

Anything you can tell me about the paper between coil layers?  When I search DIY's for winding small solenoids it seems most are 1) not necessarily tightly wrapped coil-to-coil, and 2) not having any thin dielectric material (paper, plastic, et al) between coil layers. 

However, there's definitely paper between layers in the latest #80 solenoid.  Even though the wire is enameled, what purpose does the thin dielectric between winding layers serve?  Extra precaution against short-circuiting layers?

Thanks again...

KD

@dkdkrd posted:


...

However, there's definitely paper between layers in the latest #80 solenoid.  Even though the wire is enameled, what purpose does the thin dielectric between winding layers serve?  Extra precaution against short-circuiting layers?

...

Perhaps the paper between layers makes for a smoother/flatter cylinder thereby making it easier to wind a tight coil?

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