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Electrically Isolated FeedThrough for Lightning Arrestor

Download free 3D printing files Electrically Isolated FeedThrough for Lightning Arrestor, rebeltazDownload free 3D printing files Electrically Isolated FeedThrough for Lightning Arrestor, rebeltazDownload free 3D printing files Electrically Isolated FeedThrough for Lightning Arrestor, rebeltaz

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3D model description

I needed an insulated feed through for an antenna lightning arrestor I'm building for shortwave radio. The STLs as presented are specific to my application, but I am including the FreeCAD file as well, in case you need to modify this to fit your own use.

As is, the feedthrough is designed to these specifications:

* Screw size is m4.
* The mounting hole is drilled out to 11/32".
* The material is 2.5mm thick.
* The shoulder is 18.75mm in diameter.

To modify this for your own needs, you only need to change the parameters in Sketch under bushing. The four constraints you need should be red. There are two construction lines - one for the thickness of the walls and one for the diameter of the screw. The shoulder diameter and the material thickness are modified on the actual drawing.

If you are interested in the lightning arrestor itself, it's just a scrap piece of aluminum angle into which I've drilled and tapped three holes appropriate to the spark plugs I'm using. It doesn't really matter much what type spark plug you use. I'm just using three used NGK BMP4ES plugs that I pulled out of mowers I've worked on. Wrap a solid wire from one screw (fed through the feedthough) around each of the three plugs and back down to the other feedthrough. You can solder the wire to the plug caps if you want, but as long as you wrap it tightly, I don't think it's really necessary. The whole assembly is then mounted and somehow grounded. I plan on killing two birds with one stone. I'm going to mount the block to a steel pole that I will drive into the ground. Your antenna comes in and attaches to one side while your radio attaches to the other side.


NOTE
Due to either a Thingiverse bug or (more likely) shadowbanning, my models no longer show up under the [Newest] listings. If you want to see more of my models, please be sure to 'follow' me. **If you print this, it would really help if you'd post a 'make' so that others could find this model.

  • 3D file format: STL

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I am a self-proclaimed know-it-all. I will tackle any project regardless of my experience, or lack thereof. Always ready to learn something new. With over 25+ years experience in electronic repair and 10+ years experience in small engine / ATV / motorcycle repair, there is nothing I can't fix, modify or build.

Why a pepper? In case anyone is curious as to why there is a hot pepper embossed into most of my designs... My nickname is Pepper and that little pepper logo is a hell of a lot shorter than "Copyright © 2017 by Derek J.G. Tombrello" which is how I usually sign my work :)

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