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Re: [TCML] Tips for creating Supports for a flat spiral primary coil



My thoughts exactly, 

One of the government guys wanted to give it a try, and I ended up doing the HV tests I will say it was a pretty spectacular failure, with little shards of carbonized plastic flying everywhere. 

I believe the next thing they are going to try one made out of laser cut and chem welded acrylic. 

But yes, I would not really consider using 3d printed parts in any of my coils, unless for something not directly designed to deal with the HV stresses. 



cheers, 
John "Jay" Howson IV 


"Why thank you, I will be happy to take those electrons off your hands." 

----- Original Message -----
From: "Jim Lux" <jimlux@xxxxxxxxxxxxx> 
To: tesla@xxxxxxxxxx 
Sent: Tuesday, February 25, 2014 8:49:59 AM 
Subject: Re: [TCML] Tips for creating Supports for a flat spiral primary coil 

On 2/25/14 4:36 AM, jhowson4@xxxxxxxxxxx wrote: 
> We just printed a 1/4" thick box to protect a transmitter at work, 
> 
> With a 1.5" sphere electrode, it failed at42 kv on a face, and 37Kv on a corner. 
> And once it failed it was pretty much worthless 
> 
> 

I wouldn't expect most 3D printed stuff, particularly the sintered 
powder or additive extruded plastic forms, to have very good HV 
insulating capability: all those little voids create field 
concentrations. It would be like expecting styrofoam to have a high 
dielectric strength. 

The stereolithography produced by writing a UV laser into a tank of 
liquid polymer might be better. 

But, in general, machining from a solid block is going to be better from 
a HV insulating standpoint. 

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