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| Open HV Probe 40kV |
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| beanflying:
--- Quote from: The Soulman on April 25, 2019, 09:33:58 am --- --- Quote from: beanflying on April 25, 2019, 07:29:50 am ---It is really simple SHOW ME EVIDENCE of the material or process not being suitable. --- End quote --- Engineers are used to it being the other way around. --- End quote --- Which is why it is up here and being tested against what available evidence there is and open for others to have their input. Science and Engineering are not based on who can hurl the loudest and most frequent abuse or post non evidence as fact. PLA being a relative newcomer is worthy of additional scrutiny and as I have mentioned before there is always ABS which is a more known material. |
| kony:
Defend your design, not your ego && faith, OP. The burden of prooving the due diligence being done for the design is on your side. If you provide something that ressembles design calculations and documentation, I am fully willing to provide more detailed constructive feedback, but right now I don't even see any signs of understanding of the fundamentals. |
| HighVoltage:
Nice design ! I would not worry too much about the insulation material. I have seem commercial HV probes with PVC insulation tubes and they are just working perfectly and are safe. Almost any good insulator material would work, as long as you keep the distance to your high voltage spot large enough. |
| joeqsmith:
Some time ago, we had bought some sort of plastic to machine some parts from. These parts were used in a high voltage application. Once they were made and installed, we noticed that the system was having a problem. The new plastic parts were presenting a decent load. I pulled the remaining raw stock and sure enough, it was fairly conductive at DC. The properties of the plastic chosen wouldn't have suggest it would behave this way. In the end, we bought another slab of the same material and it was fine. I never took the time to dig into why that one lot had a problem. Something in the mix. I can only think of one case like that in my entire career. Most of the commercial probes similar to what is being shown will state in their manuals that they are for CAT I only. For my own personal use, pretty much everything it CAT I and very low energy. Fairly low risk for the most part and certainly something I am willing to accept. Back to the scheduled program... |
| beanflying:
--- Quote from: kony on April 25, 2019, 02:37:24 pm ---Defend your design, not your ego && faith, OP. The burden of prooving the due diligence being done for the design is on your side. If you provide something that ressembles design calculations and documentation, I am fully willing to provide more detailed constructive feedback, but right now I don't even see any signs of understanding of the fundamentals. --- End quote --- Plastics vary electrically even engineered or injection molded ones and generally have upper and lower limits. As such no I have not done definitive calculations, in particular as there is limited data on PLA would fairly pointless. I have not seen upper and lower limits even for Engineered PLA just 'typical' or Calculated from Experiment. So Empirical evidence is what I am basing this design on using what limited data has already being linked in this thread. As I have said happy to look at EVIDENCE or Data if anyone has any. Moving along again as I am not a huge fan of drumsticks and random lumps of wood from the corner of the garden shed with nails in the end :palm: A first pass of a High Voltage Corona probe. Lanthanide Tungsten (DO NOT use Thoriated ones!) Electrode, Ceramic insulator, HV rated cable. I have gone this way to increase physical separation to the hand to the HV and any resulting Arcs. Base of the Electrode is 300mm from the Hand. And no you can't eliminate the second long barrel and shorten the design they are different Thread diameters. WARNING Even if you are a Dumbass don't play with Microwave Oven Transformers with any stick or probe. Unregulated MOTS Kill ! |
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