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Progress Update on Optical Sensors Actuators and Diffuser CM29 Development

The optical sensors actuators project is approximately 75-80% complete, with materials in hand and all Tufnol cassettes made. Two sets of brass petals have been produced (3mm and 6mm), with the 6mm brass cassette assembled and tested. Four non-magnetic actuators have been created, along with fabricated PCBs for opto-sensors. Design finalization for the air crate is pending, with challenges related to machining and assembly tolerances. Progress is hindered by resource availability and technical challenges, with an expected completion date post-Easter.

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Progress Update on Optical Sensors Actuators and Diffuser CM29 Development

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  1. Optical sensors Actuators (4) DIFFUSER CM29 Irises

  2. About 75 – 80 percent complete • Materials in hand • All Tufnol cassettes made • 2 sets brass petals (3mm & 6mm) made • 6mm brass cassette assembled & tested by hand • Drum being machined • Four home-made non-magnetic actuators made; one tested • PCBs for opto-sensors made & stuffed • Mods to electronics crate ~ finished • Not committed to final front panel yet (cosmetics) • Still to finalise design of air crate • Need some experience of pneumatic actuators • Progress limited by • Availability of effort / CNC machines / my availability to chase

  3. Technical problems • Proved tricky to machine 4mm thick SS “inner rings” • Aluminium not good enough • Need to grind machined SS flat • Tolerances of slots in petals are tricky • Long lever arm to centre • 0.05 mm gets multiplied by ~8 when closed • Unsightly gaps at centre (bad teeth!) • ~1% physics problem • Mainly annoying • But may be worse with Tungsten • Examining solutions We want to play with some slots & holes in some gash tungsten before cutting the petals – expensive material

  4. SCHEDULE Main hold up is availability of effort (including me & V.B.) & machines Mechanics finished “not before Easter” (24 April)

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