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13:17, 29 November 2019 1st of fortnightly meetings
<big>Attendees</big> - Nic Erasmus, James O'Connor, Egan Loubser, Ali Ranjbar, Chris Mottram, Stuart Bates
<big>Mechanical</big>
* We now have a Zemax file from Iain, this model makes the instrument a little more compact, (model sent to James).
* Iain has requested the filters in the filter slides be increased to 35mm clear aperture (from their current 30mm)
** From James, this increase would require either longer translation stages to position each filter slide or a reduction in the number of filters from 3x4 (5 position filter slides with one clear position in each), to 3x3.
** Ali is looking to reduce the length of the grism assembly further (currently 40mm)
* Ali has suggested a stepper motor be used to rotate the grism assembly to optimise for red and blue, looking into feasibility
* James has requested LJMU start looking at their requirements for the instrument interface
* We will be using compressed air for slit, calibration mirror and grism assembly deployment
<big>Control</big>
* James will speak with electronic control people at his end regarding controlling filter slides, stepper motor and solenoids
* Chris Mottram looking at options to control stepper and filter slides
* SAAO mentioned dissapointing results using Ardunio's in the past
* Nic and Chris discussing software layers, which controls what
* We should create a diagram showing all control and power items, and their relationships with each other
<big>Optics</big>
* Iain raised concerns regarding substrate materials if we are to use use this instrument to observe further blue than 400nm
<big>Organisation</big>
* It was agreed we need to put a schedule together to co-ordinate effort appropriately
<big>Action Items/ Decisions Req'd</big>
* Increasing the filter clear aperture - is this a no-go from a science perspective (reducing filters or longer filter actuators)? - Science team
* Reduce length of Grsim assembly further - Ali
* Purchase and test stepper motor - LJMU
* Produce model of required instrument interface - LJMU
* Decide how will actuators be controlled - Chris/Nic
* Create diagram showing all power, control and motion requirements and relationships - LJMU
* Create initial schedule - LJMU
Date of next meeting - Friday 13/12/2019