Any ideas on how to wind this PI coil ?

[6666]

this thread is only about the mechanics of winding this coil design, not about fast coils.
Built it, tested it, works fine.

[Andi68]

Well, the coil is just one component of the detector - what good is a fast coil if the circuit is bad ....
Anyone who thinks independently will do their own experiments and draw conclusions, there is no godparent recipe.
Re-building without knowledge, that is a bad solution ....

[kt315]

Thanks for your input about fast coils, but this thread is only about the mechanics of winding this coil design, not about fast coils.

The original designer left the forum after some stupid political thread , so I cannot ask him.

no sense to discuss if coil is not fast. i reminder to people a time when they loudly laughed on me if i told about litz in coil.
now they do coils with litz and no laugh.

[dbanner]

KT is right, this sequence of windings is nonsense. If you want to make flat spiral coil with two layers, just wind the bottom layer first in sequence then make a pass back with the top layer. Then all turns will be consecutive and easy to wind. The concentration of magnetic lines of flux will be the same.

[6666]

This is going to drive KT nuts loll , but I first print circular U channel which act's like a bobbin or spool ( much like how Garret makes their VLF coil spools), I did I bit of testing on making my PI coils this way and I see no real depth lost with an open air coil or a U channel spool made from ABS plastic, I'm sure what KT is trying to say is right, BUT shesh how else is one, to make a coil Especially for a Surf PI , it is not the most advance metal detect lol i'm no expect by any means, however i'm rather sure the circuit would never be fast enough for the kind of coils KT has in mind anyways! Perhaps KT can post photo's of finish coil that he makes ?

Hi , yes the circular U channel idea is similar to my idea of the flat plates and spacer, might try the bevelled edge spacer plate, but not sure if it will make the offset pattern as it winds,
the offset should make a narrower coil.

[6666]

Thanks for your input about fast coils, but this thread is only about the mechanics of winding this coil design, not about fast coils.

The original designer left the forum after some stupid political thread , so I cannot ask him.

[kt315]

This is going to drive KT nuts loll , but I first print circular U channel which act's like a bobbin or spool ( much like how Garret makes their VLF coil spools), I did I bit of testing on making my PI coils this way and I see no real depth lost with an open air coil or a U channel spool made from ABS plastic, I'm sure what KT is trying to say is right, BUT shesh how else is one, to make a coil Especially for a Surf PI , it is not the most advance metal detect lol i'm no expect by any means, however i'm rather sure the circuit would never be fast enough for the kind of coils KT has in mind anyways! Perhaps KT can post photo's of finish coil that he makes ?

http://www.geotech1.com/forums/showt...l-for-baracuda

[qute1]

Thanks kt315 and tibuck love the banter and yes some of us have only been making coils for a couple of years and only wish to see how the masters do it!
Took the liberty of a quick translate for all us englishish speakers hope thats ok KT315.
PI_instr.ru.en.pdf

[Tibuck19]

Any thoughts on how you would wind the coil wrap ?

This is going to drive KT nuts loll , but I first print circular U channel which act's like a bobbin or spool ( much like how Garret makes their VLF coil spools), I did I bit of testing on making my PI coils this way and I see no real depth lost with an open air coil or a U channel spool made from ABS plastic, I'm sure what KT is trying to say is right, BUT shesh how else is one, to make a coil Especially for a Surf PI , it is not the most advance metal detect lol i'm no expect by any means, however i'm rather sure the circuit would never be fast enough for the kind of coils KT has in mind anyways! Perhaps KT can post photo's of finish coil that he makes ?

[kt315]

I AGAIN GIVE FULL INSTRUCTION HOW TO DO FAST COIL RIGHT

[kt315]

give give give us. oh great guru! give. nothing of own mind control.

i say again - your mistake filling the coil by epoxy.
look on table at right https://en.wikipedia.org/wiki/Relative_permittivity
you never get fast coil with epoxy.
your physics school level is very poor. thats big trouble.

[qute1]

Give us your design for a best fast coil for surfpi then kt315 (fast tipo) do tell us more oh great guru....

[kt315]

this coil is not fast tipo and no sense to tell more.

[6666]

then insert the coil

Any thoughts on how you would wind the coil wrap ?

[Tibuck19]

IC I didn't think with bigger gauge wire it would be effected that much by salt water. In that case if I was to make it , I would probably be using my 3dprinter, I would make a coil wrap and make the coil housing in two half's leaving a 0.4 mm wall ,5 to 10 mm over hang on beyond one of the two half, I would spray the graphic in to both, then insert the coil, and acetone both half's together and pour the Epoxy resin throw the a fill hole.