<div dir="ltr">Many thanks to all the comments and encouragement about my tunnel house window opener. <div>I hadn't actually twigged that the diameter of the wire 'stacking' wheels was critical to their operation. Just total luck that the only material I had to make the pulley centres was 25mm wide, the same as the tube used for the windlass.</div><div>I've got a bit of tidying up to do on the polythene wheel spacers but I expect to have the whole project completed by the end of the week ;)</div><div><br></div><div>Cheers</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Feb 20, 2023 at 9:48 PM Mark Atherton <<a href="mailto:markaren1@xtra.co.nz">markaren1@xtra.co.nz</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hello everyone,<br>
<br>
Good turnout with 25 attendees, and lots of huddles-of tech-talk. $41 + <br>
change (in gold, and flat-money) collected and transferred into the <br>
robotics loose-change jar (for later banking).<br>
<br>
Lots of new faces; welcome everyone.<br>
<br>
All sales from the trading table should go into the brown box on the <br>
wall, and are directly for the benefit of our host club, Christchurch <br>
Amateur Radio Club, NZART Branch 05.<br>
<br>
Equipment donations are welcome for the trading table, but no CRT based <br>
product, printers, toner or items that are likely to be a disposal burden.<br>
<br>
With thanks on behalf of the group,<br>
<br>
Mark Atherton<br>
<br>
----------------<br>
<br>
Mark talked about an uncommitted control surface with a main-matrix of 8 <br>
x 8 push buttons and LEDs. Unit communicates using MIDI over USB and has <br>
a published interface spec. Four broken units were purchased on eBay for <br>
roughly the same price a single working one from TradeMe. Each unit had <br>
a (differently) broken USB connector. All have now been repaired.<br>
<br>
Mark also talked about a recently acquired 1080P HDMI video camera with <br>
C mount lens fitting. Interesting time evaluating various lenses using a <br>
test card and native 1080P monitor.<br>
Zoom lenses performed the poorest, with chromatic aberrations, and poor <br>
resolution at corner targets. Best performing lenses were small, fixed <br>
focal length. There was also common left/right blue/yellow aberration <br>
which could be a sensor issue.<br>
<br>
Graham brought in some custom-fabricated fiberglass front wings from a <br>
McClaren F5000 racing car; he talked about issues associated with their <br>
design and fabrication.<br>
<br>
Robin talked about progress with his motor-controlled greenhouse <br>
window-opening project. Progress is being made, the new design appears <br>
to work.<br>
<br>
William demonstrated his home-made dehumidifier; one of the more <br>
interesting looking pieces of kit we have seen for a while.<br>
<br>
Rudy talked about a trip to an auction-house in Ashburton who were <br>
selling off some vintage gaming equipment.<br>
<br>
Daren talked about the recent cyber-attack on the UK Royal Mail <br>
(international) group, and some of the unexpected conversations between <br>
attacker and victim.<br>
<br>
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