Re: [EVGRAY] Contact arm on swivel board

Body

DougIf they sell short bits of bigger diameter copper pipe, like 2" or so, there are possibly ABS fittings that may allow you make a really good solid assembly of thicker copper sectors, along with epoxy, mixed with very fine wood sanding saw dust.The trick is to use a band of something outside, like a drink bottle, perhaps, that will give a super smooth outside surface for real brushes, sitting in proper plastic brush holders, to glide against, when used as a mold, and removed.It may be a bit finicky using a jewelers' coping saw to hand cut the sectors out of copper pipe, but it does work pretty well in the kitchen.Epoxy is not smelly and won't annoy the neighbours, as you know.The very fine teeth of a jewelers' saw means that you don't need a superb vise, or anything, to do good work, cutting the copper pipe.Try to rough up the copper pipe pipe with coarse sand paper inside to help the epoxy to stick, but, you know that, along with soldering the leads, before sticking down, so the heat won't bother the adhesion.
Keep at it! The experiment seems to be successful, so far, giving you what you want to know. I hope.Cheers Warren
Sent from Yahoo Mail on Android 
 
  On Sun, 10 Feb 2019 at 5:45 AM, [email protected] [EVGRAY]<[email protected]> wrote:       
Hi Warrem
Very Fred fFlntstone i am doing now idea is to do peak coil shotring switching with this brush commutator it justneeds to last an hour or so for experimemts to get some numbers Going bavk to hall efcect and mosfet for driving motor half of the spilt coils on ssme core, then use brushcommutaor for thepeak coil shorting onveneratorwinds on the split- coil wound core.
At least Igot a top speed of 1600rpm plus input around 300ma at 12v input for motorcoils so now need to match or exceed that using halls and mosfet.
Peak coil shorting of the generator winds likes brush commutators since such low resistance that way and hyper spikes dont blow up e erything solid state.
Kone
  #yiv1864218428 #yiv1864218428 -- #yiv1864218428ygrp-mkp {border:1px solid #d8d8d8;font-family:Arial;margin:10px 0;padding:0 10px;}#yiv1864218428 #yiv1864218428ygrp-mkp hr {border:1px solid #d8d8d8;}#yiv1864218428 #yiv1864218428ygrp-mkp #yiv1864218428hd {color:#628c2a;font-size:85%;font-weight:700;line-height:122%;margin:10px 0;}#yiv1864218428 #yiv1864218428ygrp-mkp #yiv1864218428ads {margin-bottom:10px;}#yiv1864218428 #yiv1864218428ygrp-mkp .yiv1864218428ad {padding:0 0;}#yiv1864218428 #yiv1864218428ygrp-mkp .yiv1864218428ad p {margin:0;}#yiv1864218428 #yiv1864218428ygrp-mkp .yiv1864218428ad a {color:#0000ff;text-decoration:none;}#yiv1864218428 #yiv1864218428ygrp-sponsor #yiv1864218428ygrp-lc {font-family:Arial;}#yiv1864218428 #yiv1864218428ygrp-sponsor #yiv1864218428ygrp-lc #yiv1864218428hd {margin:10px 0px;font-weight:700;font-size:78%;line-height:122%;}#yiv1864218428 #yiv1864218428ygrp-sponsor #yiv1864218428ygrp-lc .yiv1864218428ad {margin-bottom:10px;padding:0 0;}#yiv1864218428 #yiv1864218428actions {font-family:Verdana;font-size:11px;padding:10px 0;}#yiv1864218428 #yiv1864218428activity {background-color:#e0ecee;float:left;font-family:Verdana;font-size:10px;padding:10px;}#yiv1864218428 #yiv1864218428activity span {font-weight:700;}#yiv1864218428 #yiv1864218428activity span:first-child {text-transform:uppercase;}#yiv1864218428 #yiv1864218428activity span a {color:#5085b6;text-decoration:none;}#yiv1864218428 #yiv1864218428activity span span {color:#ff7900;}#yiv1864218428 #yiv1864218428activity span .yiv1864218428underline {text-decoration:underline;}#yiv1864218428 .yiv1864218428attach {clear:both;display:table;font-family:Arial;font-size:12px;padding:10px 0;width:400px;}#yiv1864218428 .yiv1864218428attach div a {text-decoration:none;}#yiv1864218428 .yiv1864218428attach img {border:none;padding-right:5px;}#yiv1864218428 .yiv1864218428attach label {display:block;margin-bottom:5px;}#yiv1864218428 .yiv1864218428attach label a {text-decoration:none;}#yiv1864218428 blockquote {margin:0 0 0 4px;}#yiv1864218428 .yiv1864218428bold {font-family:Arial;font-size:13px;font-weight:700;}#yiv1864218428 .yiv1864218428bold a {text-decoration:none;}#yiv1864218428 dd.yiv1864218428last p a {font-family:Verdana;font-weight:700;}#yiv1864218428 dd.yiv1864218428last p span {margin-right:10px;font-family:Verdana;font-weight:700;}#yiv1864218428 dd.yiv1864218428last p span.yiv1864218428yshortcuts {margin-right:0;}#yiv1864218428 div.yiv1864218428attach-table div div a {text-decoration:none;}#yiv1864218428 div.yiv1864218428attach-table {width:400px;}#yiv1864218428 div.yiv1864218428file-title a, #yiv1864218428 div.yiv1864218428file-title a:active, #yiv1864218428 div.yiv1864218428file-title a:hover, #yiv1864218428 div.yiv1864218428file-title a:visited {text-decoration:none;}#yiv1864218428 div.yiv1864218428photo-title a, #yiv1864218428 div.yiv1864218428photo-title a:active, #yiv1864218428 div.yiv1864218428photo-title a:hover, #yiv1864218428 div.yiv1864218428photo-title a:visited {text-decoration:none;}#yiv1864218428 div#yiv1864218428ygrp-mlmsg #yiv1864218428ygrp-msg p a span.yiv1864218428yshortcuts {font-family:Verdana;font-size:10px;font-weight:normal;}#yiv1864218428 .yiv1864218428green {color:#628c2a;}#yiv1864218428 .yiv1864218428MsoNormal {margin:0 0 0 0;}#yiv1864218428 o {font-size:0;}#yiv1864218428 #yiv1864218428photos div {float:left;width:72px;}#yiv1864218428 #yiv1864218428photos div div {border:1px solid #666666;min-height:62px;overflow:hidden;width:62px;}#yiv1864218428 #yiv1864218428photos div label {color:#666666;font-size:10px;overflow:hidden;text-align:center;white-space:nowrap;width:64px;}#yiv1864218428 #yiv1864218428reco-category {font-size:77%;}#yiv1864218428 #yiv1864218428reco-desc {font-size:77%;}#yiv1864218428 .yiv1864218428replbq {margin:4px;}#yiv1864218428 #yiv1864218428ygrp-actbar div a:first-child {margin-right:2px;padding-right:5px;}#yiv1864218428 #yiv1864218428ygrp-mlmsg {font-size:13px;font-family:Arial, helvetica, clean, sans-serif;}#yiv1864218428 #yiv1864218428ygrp-mlmsg table {font-size:inherit;font:100%;}#yiv1864218428 #yiv1864218428ygrp-mlmsg select, #yiv1864218428 input, #yiv1864218428 textarea {font:99% Arial, Helvetica, clean, sans-serif;}#yiv1864218428 #yiv1864218428ygrp-mlmsg pre, #yiv1864218428 code {font:115% monospace;}#yiv1864218428 #yiv1864218428ygrp-mlmsg * {line-height:1.22em;}#yiv1864218428 #yiv1864218428ygrp-mlmsg #yiv1864218428logo {padding-bottom:10px;}#yiv1864218428 #yiv1864218428ygrp-msg p a {font-family:Verdana;}#yiv1864218428 #yiv1864218428ygrp-msg p#yiv1864218428attach-count span {color:#1E66AE;font-weight:700;}#yiv1864218428 #yiv1864218428ygrp-reco #yiv1864218428reco-head {color:#ff7900;font-weight:700;}#yiv1864218428 #yiv1864218428ygrp-reco {margin-bottom:20px;padding:0px;}#yiv1864218428 #yiv1864218428ygrp-sponsor #yiv1864218428ov li a {font-size:130%;text-decoration:none;}#yiv1864218428 #yiv1864218428ygrp-sponsor #yiv1864218428ov li {font-size:77%;list-style-type:square;padding:6px 0;}#yiv1864218428 #yiv1864218428ygrp-sponsor #yiv1864218428ov ul {margin:0;padding:0 0 0 8px;}#yiv1864218428 #yiv1864218428ygrp-text {font-family:Georgia;}#yiv1864218428 #yiv1864218428ygrp-text p {margin:0 0 1em 0;}#yiv1864218428 #yiv1864218428ygrp-text tt {font-size:120%;}#yiv1864218428 #yiv1864218428ygrp-vital ul li:last-child {border-right:none !important;}#yiv1864218428