Re: [EVGRAY] Contact arm on swivel board

Body

DougYou have a complex technical demand, regarding your commutators.I wish I knew more about the mechanical requirements of your "brushes"Brushes can be made from graphite, sinterized graphite bronze, and all kinds of weird stuff in between, depending on the rigidity, and accuracy also, of the armature segments of copper.I have made up quite a number of these prototype units for timing all kinds of gizmos, because I had to switch high current on and off reliably before solid state components, and for me, the knowledge how to use them.Also they were needed at 3:00  in the morning to be magic by 7:30 am crew call. I used epoxy and wood saw dust, sections of large diameter, and thickness, of copper pipe, cut with the band saw from the end, when the centre was filled with epoxy, then turned it on the metal lathe. I have used all sorts of brushes and if possible, their brush holders, scavanged from power tools, and appliances, I would find on the streets of the big city, or of course scrap yards, and salvage shops.It was my stock, and trade for making robots, space ships, and science fiction objects that didn't yet exist, but still had to appear to "work" and do something.Now, you have been doing amazing work with your apparatus.What do you think might make it better, if you had access to it?I don't suggest you burden yourself with  tons of machinery, and tools, as I have done.That leads to a whole bag of worms just coping with the logistics of space and place, in a warm, dry atmosphere, to the point of hardly being able to get anything done, just dealing with infrastructure shit.I am not sure of the solution, but it would be good to work together, somehow, pooling talents, and resources.A thought. Cheers Warren


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  On Sun, 10 Feb 2019 at 12:59 AM, [email protected] [EVGRAY]<[email protected]> wrote:       
Hi Mick
Before thiz favoritte brush materiali was the silicone coated thousands of very thin wire stranded "noodle" wire they zell in hobby stores to hookup battery supplies in RC carz or planes. Regular copper wire does not work well as a brusb against the copper commutator it doesnt let instantaneous power throuvb very well. I have three spooks of Nichrome 32ga to make resistors, it seems to work best so far 
Kone
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