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

[rudy.kremers at 123gaming.com]

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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