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[TCML] Re: Fine Structure in a Trumpet Coil
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[TCML] Re: Fine Structure in a Trumpet Coil
To : tcml@xxxxxxxxxxxxxxx Subject : [TCML] Re: Fine Structure in a Trumpet CoilFrom : "Jim Lux" <jim@xxxxxxxxxxxxx >Date : Tue, 01 Sep 2026 12:32:03 -0400Arc-authentication-results : i=1; mail111c38.carrierzone.com; arc=none smtp.remote-ip=127.0.0.1Arc-message-signature : i=1; d=carrierzone.com; s=mailmia; a=rsa-sha256; c=relaxed/relaxed; t=1788280339; h=From:To:Subject:Date:Message-ID:MIME-Version:Content-Type; bh=WROzEm3oTGaUf5Ueh4jGtBJWZ71mxoiEyiK9CXfnGGA=; b=z8DvPix4DVFltZHXjbfuFOru1f2Dp7DvHTlq1hj4Oj304veQnW6JvWk6m0I3A06uc0os ujAYotQccyJG21ab5uqqG712NZyFqsCoFlfvvikWJz7Xj3PXOARLVhg2UM+sOy05oxm2R 8+GcgAk/cLQoUjv3Kr31yLyGQ0onHvAoFw=Arc-seal : i=1; d=carrierzone.com; s=mailmia; a=rsa-sha256; cv=none; t=1788280339; b=BUMxIfJeThMfNyBy36gTDa0M0zkz6MqM+/tsAtpKcodmJPaKRPjX7jKe7Xk++GncnoGR dhpPngmwWi2ATtUNKmTHaqlu04Av4Qg30xKGlzjBlJmqCM8NDcNiQlOSgLRNmRyHzX6g5 1SgG0Ejwd5dbqbtrD/xtdlEqwd3aayOszM=Archived-at : <https://tcml.pupman.com/archives/list/tcml@xxxxxxxxxxxxxxx /message/OTVM4BJM745UZXZ5WHQOSC4U5OJMN5HQ/>Authentication-results : piggy.pupman.com; dkim=pass (2048-bit key, unprotected) header.d=emwd.com header.i=@emwd.com header.a=rsa-sha256 header.s=harmony header.b=pTOFCt7/; dkim=fail reason="signature verification failed" (2048-bit key, unprotected) header.d=mailc38.carrierzone.com header.i=@mailc38.carrierzone.com header.a=rsa-sha256 header.s=hmail header.b=f2JtVgKz; dkim=fail reason="signature verification failed" (2048-bit key, unprotected) header.d=luxfamily.com header.i=@luxfamily.com header.a=rsa-sha256 header.s=hmail header.b=EBCUU2ybAuthentication-results : host.harmonylists.io; dkim=pass (2048-bit key; unprotected) header.d=mailc38.carrierzone.com header.i=@mailc38.carrierzone.com header.b="f2JtVgKz"; dkim=pass (2048-bit key; unprotected) header.d=luxfamily.com header.i=@luxfamily.com header.b="EBCUU2yb"; dkim-atps=neutralAuthentication-results : mail111c38.carrierzone.com; noneCc : Delivered-to : teslaarchive@xxxxxxxxxx Dkim-filter : OpenDKIM Filter v2.11.0 piggy.pupman.com 8946642BEC3Dkim-signature : v=1; a=rsa-sha256; c=simple/simple; d=emwd.com; s=harmony; t=1788280834; bh=eOSrQ1JQi5g3M/cczVLop2WC/mJT1331bDkT7yQnFSU=; h=From:To:CC:Date:In-Reply-To:References:Reply-To:Subject:List-Id: List-Archive:List-Help:List-Owner:List-Post:List-Subscribe: List-Unsubscribe:From; b=pTOFCt7/f1IEDO5xTbQjrzMlxYx/2FBcT1bk6pr3dpghbS1s2mEnsBk0JaB1VjBRa 6ST8HtiQkJUwLGmLW7X34ZciLD56EGD00/OXRY0GtA9YCmYZsCkdMsqcNxEZb+gj8N 74GSn9vgiUR+NXJP7z7FA3Q/8n1gU0r1V4n9uL12agglW1E0/Os+Xzj7NmuodqnuFb dvcu4hX3Mt8AIwWNIbisUIQZR4X8sQUP9G1AMB41mF2C8IlqZ7tQqvy/NN4zfAxl51 NnaKuwrsBVFr209pj+udfdZ2G/B2saJHaNRYKMzYAjOj+jpyQThCXA18XXNKmVtOim kgSumutMnAKMA==Dkim-signature : v=1; a=rsa-sha256; c=relaxed/simple; d=mailc38.carrierzone.com; s=hmail; t=1788280339; bh=PWxEiAZMozRBvvZdelKuC5RrZ0Df9Sl8fC8Yaj3EB5g=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=f2JtVgKzXW/4tcgZrRqTrB0J7SLtvubcO1N+xOPkXei3kDGzGquktuv0y099iOLVF WSROFoJvt97KGqtO92cml9Jp74jIWw1Spl0mNwHHTG9DyOwQ2hJvmnNTy/lQJ5DxYp fPw0jFEfAnN1u+krysu1WJ6m9cei97P1bLnv3TKnCWx7oQZIT/bddRBGRhVc5bMlxX lbUoaTZU/fSNwb+QgTs/Xy4b26Q3d4DAsYV0tGEHXgB2oGNQo3KY4ruNNIUMgQxcYi ZKh4Q1m13abHpGDokSR4RvdpWD1Ow6+nqhfltLrD/CHIdLYVHDwJKojGPEXxssp0M+ W9AfZzb4DzWrA==Dkim-signature : v=1; a=rsa-sha256; c=relaxed/simple; d=luxfamily.com; s=hmail; t=1788280339; bh=PWxEiAZMozRBvvZdelKuC5RrZ0Df9Sl8fC8Yaj3EB5g=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=EBCUU2ybX4tfrlZDUyTYg/WPe4EOGUavuBpn7Hv3G4k3M3lxSpxP20LFMPrJ+7EM+ EtcmYlj1PVlPiFj13hT/pPDDHOGGFH+1TZUJLFKY8z+PT64WVVCYKcLIJ3eztqVBmS 2ARCBmeaZv0fmNXxJ198BWZYOpWW0Aem06CgKdcQ1JiZ6L+iB3IFzI5QxVBPSXDrn+ 9ed4Xy5Xi3L6X9sZkt7xGMKc7e76kcuolNe1Dyfeeqj0xQl73wEw5jzsIt8xHL1mf9 MudDq7ck3Jzfc6kY4ysn6Gga482BcO8T+XL8xrJFpL6M4gysi+hxHjRI9Fe+6MPCaZ 34R7/0MaSb+DA==Feedback-id : hid-02422:stype-pmail:fwd-no:02422-pmailIn-reply-to : <d6421ee1-00c5-42f4-9c95-68d640cdda39@lists.symmetric.net >List-archive : <https://tcml.pupman.com/archives/list/tcml@tcml.pupman.com/ >List-help : <mailto:tcml-request@tcml.pupman.com?subject=help >List-id : Tesla Coil Mailing List <tcml.tcml.pupman.com>List-owner : <mailto:tcml-owner@tcml.pupman.com >List-post : <mailto:tcml@tcml.pupman.com >List-subscribe : <mailto:tcml-join@tcml.pupman.com >List-unsubscribe : <mailto:tcml-leave@tcml.pupman.com >References : <CAD1NOy+WBSvEaCc+RqU88rHF+oEUemiAs0Bcyh_imvinxh_djw@mail.gmail.com> <1eb1f3e6-68c7-4813-a07d-b0dbabdab1fa@lists.symmetric.net> <CAD1NOyLjA9WRxyUo9eRnMOSFzqQcGaBeY=Bj2B+hNsuO9B8uFQ@mail.gmail.com> <4f849b34-bf2d-406d-89a4-9745f16855fb@lists.symmetric.net> <CAD1NOyLHx6WdYLzQyiikDo+GJNrGgEd+NFsvjvkRCYdP__=jZw@mail.gmail.com> <d6421ee1-00c5-42f4-9c95-68d640cdda39@lists.symmetric.net >Reply-to : Tesla Coil Mailing List <tcml@xxxxxxxxxxxxxxx >
I'm thinking that if you have some sort of form, and you wind the secondary with something sticky, and not under too much tension, it will stay in place.
Or, one could "groove" the form (although making a spiral groove on a trumpet would make for an interesting CNC program).
Conical secondaries have been built (Dick Aurandt's coil at Griffith Observatory) and there've been others who have built them on this list. Keeping the windings in place before coating/gluing has been the challenge.
Predicting the inductance and coupling would be challenging analytically - but an FEM approach would probably work.
On Tue, 1 Sep 2026 09:24:14 -0500, Ken <pupman.com@xxxxxxxxxxxxxxxxxxx> wrote:
Note I've not committed to constructing anything for anyone. I'm curious about the requirements and based off that, maybe I can help, or not.
The form for a trumpet shaped coil is probably not a big deal to fabricate. The challenge will be winding the coil so it doesn't collapse.
I don't use NC machine tools, but you don't need to with a decent lathe, even for complex contours.
There's still no hints as to whether this project needs a watchmaker's lathe or something they'd have at a heavy machine shop, or something in between.
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