[chbot] Robotics Group meeting, Monday 15 Oct 2018, 630pm, 5 Idris Road

[Trevor Wignall]

The Christchurch Amateur Radio Club holds informal meetings every Tuesday
night from about 7:30 onwards.
Trevor

On Tue, Oct 16, 2018 at 1:26 PM rudy.kremers at 123gaming.com <
rudy.kremers at 123gaming.com> wrote:

> Hi Mark,
>
>  I think I left my nuts on the trading table. Let me know if/when someone
> will be there next.
> Cheers,
> Rudy.
>
>
>
> Sent from my Samsung Galaxy smartphone.
>
>
> -------- Original message --------
> From: Mark Atherton <markaren1 at xtra.co.nz>
> Date: 15/10/18 9:50 PM (GMT+12:00)
> To: Christchurch Robotics <chchrobotics at lists.linuxnut.co.nz>
> Cc: Rory Deans <rory1 at xtra.co.nz>, Ian MacPherson <ian at macpherson.gen.nz>
> Subject: [chbot] Robotics Group meeting, Monday 15 Oct 2018, 630pm, 5
> Idris Road
>
> Hello everyone,
>
> Enthusiastic turnout with 23 attendees, and lots of huddles-of
> tech-talk. $31 + change (in gold, and flat-money) collected and
> transferred into the robotics loose-change jar (for later banking). NB
> The group deposited over $150 into the brown box, $10 of the gold-coin
> box was used for associated change.
>
> Quick reminder: equipment donations are welcome for the trading table,
> but no CRT based product, printers, toner or items that are likely to be
> a disposal burden. All sales from the trading table should go into the
> brown box on the wall, and are directly for the benefit of our host
> club, NZART Branch 05.
>
> With thanks on behalf of the group,
>
> Mark Atherton
>
> PS Lots of interest in having Dave Jagger back if possible, and for him
> to talk about almost any aspect of his technical contribution to ARM; he
> was a great speaker.
>
> ============
>
> William gave a demo of his latest audio-machine, the “blipper-4000p”. An
> agile audio generator based on the 555, along with some analogue switches.
>
> Andrew E brought along his completely home-made (MDF) CNC machine. Final
> unit will have plastic-cutting-board central guides, and PET plastic
> runners. Position is resolved using a home-made tincan opto-chopper.
> Apparently based on a design by the German engineer ‘Homofaciens’, this
> is quite an ingenious design.
>
> Andrew D brought along his scope-atron-9000; a 1960s vintage
> oscilloscope with the CRT replaced by a huge lens and a 320x200 LCD
> driven by an Arduino. Coloured display patterns form a fascinating a
> puzzle to the user; very creative piece of kit.
>
> Russel was helped into the club room with his 48VDC to 220VAC
> multi-kilowatt invertor, based on a Chinese series of pre-built modules
> (complete with semiconductors, and heatsinks). He talked about some of
> the issues of building and testing his unit.
>
> Graeme brought in more of his spark-eroded work, including a 6mm mild
> steel plate with a series of test cuts. The unit appears to be cutting
> about 3mm per hour. Quite impressive progress with this project.
>
> Steven talked about one of his recent purchases; a time-of-flight
> optical distance sensor.
>
>
>
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