Coils - Specification & Product Codes?

[jacksonsinliss]

Does anyone know how Coils are described by their Product Codes? The Williams codes appear to be two pairs pair of numbers, such as FL 20-300 / 28-400 for the Flippers (FL?) so it may be that this is the AWG and the number of turns. The first pair is the primary/Kick and the second pair is the secondary/Hold?

I have two Williams Flipper Coils from a 1958 machine (Kick Off) that have wires of different gauges: they both have no wrappers so no ID, the right flipper coil has a primary coil that is 22 AWG and the left flipper coil has 18 AWG wire. Obviously, at least one has been replaced, probably the one that has the thicker wire - it also has the designation "SMIRG 6B"? I think the correct coils might be either FL-21-375/28-400, like 1964/5 machines, or they could be FL 25-930/31-600, like the 1959/60 machines, but if anyone knows for sure then please let me know. I cannot find a Schematic for this machine so I can only go on the machines closest to it in age?

FYI, I am refurbishing this machine and it has been messed with so this is just one mystery to solve. How the cabinet came to have had metal rails fitted is for another post when I get around to that!

 

[pinballtoys]

check this IPDB LINK
click on link to 1967 kickoff, open manual or schematic
your right mentions FL1 21-375 / 28-400 as flipper coils
Cheers Bob

 

[jacksonsinliss]

Thank you, Bob, prompt help appreciated.
This machine is the Williams 1958 Soccer Kick-Off, UK version, not the later 1967 one. https://www.ipdb.org/machine.cgi?id=5188
It is identical to the US version called Kick-Off. The IPDB record does not have a link for the Schematic.

 

[AlanJ]

https://flippers.com/coil-resistance.html

and better Williams EM info here
https://www.pinballmedic.net/coilchart.html#williamsemcharts

 

[Jagspete]

I know that the 2nd set are the wire gauge and number of turns.

 

[Gary Flower]

The Pinball Resource

 

[jacksonsinliss]

Nearly right... the code format is "OhmsResistance-Number of Turns". The Wire Gauge (AWG) is not mentioned but you could calculate it from the resistance and number of turns?
Thank you, Alan & Gary for the links to the charts for coils.

 

[jacksonsinliss]

While researching this question on Coils I found another mystery... the Coil Armature (that solid bar of steel in the middle) has a "Stop Buffer" at the end of the Coil where the wires attach. Does anyone know anything about this? They mostly appear to be a Brass Rivet through a Steel cup, like the one in the 1st picture... is there a reason for this "complicated" construction or can it be just a steel (or Brass) stud or bolt, like the ones in the 2nd or 3rd picture?

 

[Gary Flower]

Steve, at Pinball Resource used to publish/sell very informative charts.

I'm confident, if you speak to him, he will know what you need and almost definitely be able to supply it.

If I can help further please let me know. If all else fails I can probably get the info elsewhere.

 

[Gary Flower]

While researching this question on Coils I found another mystery... the Coil Armature (that solid bar of steel in the middle) has a "Stop Buffer" at the end of the Coil where the wires attach. Does anyone know anything about this? They mostly appear to be a Brass Rivet through a Steel cup, like the one in the 1st picture... is there a reason for this "complicated" construction or can it be just a steel (or Brass) stud or bolt, like the ones in the 2nd or 3rd picture?

Once again, Steve Young almost definitely sells these. Magnetism/EMF might be an issue.

 

[astyy]

While researching this question on Coils I found another mystery... the Coil Armature (that solid bar of steel in the middle) has a "Stop Buffer" at the end of the Coil where the wires attach. Does anyone know anything about this? They mostly appear to be a Brass Rivet through a Steel cup, like the one in the 1st picture... is there a reason for this "complicated" construction or can it be just a steel (or Brass) stud or bolt, like the ones in the 2nd or 3rd picture?

This is interesting;
https://pinside.com/pinball/forum/t...-are-engineered-the-way-they-are#post-4112343

 

[jacksonsinliss]

This is interesting;
https://pinside.com/pinball/forum/t...-are-engineered-the-way-they-are#post-4112343

Thank you, astyy, that is more than interesting, it explains in detail how coils are designed and it answers my question. The 'Coil Stop' must be made of Copper in AC Coils but can be Steel in DC Coils.

 

[DAD]

That is really interesting information - you learn something every day in this hobby [emoji846]