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Diffuser Status: MICO Meeting, 16 th Nov. 2011

Diffuser Status: MICO Meeting, 16 th Nov. 2011. V. Blackmore. Testing. Brass irises opened/closed ~10k times without trouble. But tungsten. 2/5. * These are actually stainless steel , but the shape is still the same!. Tungsten Petals. Complicated shape. Tungsten is hard . *.

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Diffuser Status: MICO Meeting, 16 th Nov. 2011

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  1. Diffuser Status:MICO Meeting, 16th Nov. 2011 V. Blackmore

  2. Testing • Brass irises opened/closed ~10k times without trouble. • But tungsten... 2/5

  3. * These are actually stainless steel, but the shape is still the same! Tungsten Petals • Complicated shape. • Tungsten is hard.... * • ...and brittle. • One thin tungsten petal broke at its weakest point after 8k actuations. 3/5 • Breaks easily.

  4. The Solution: • Brass is easy to machine and has proven it works. • Do the fiddly bits in brass, not tungsten. • Eliminates a weak point where the tungsten can break. • Fasten tungsten to brass “backing plate”. • So far so good. • Ordered more (machinable!) tungsten Existing tungsten petal retrofitted onto a 2mm brass backing plate. 4/5

  5. Status 6/5

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