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Enhancements in Tungsten Petals for Diffusers: Brass Solutions for Durability

In a meeting on November 16, 2011, we evaluated the performance of tungsten petals in diffusers. While brass irises operated flawlessly after 10,000 cycles, tungsten petals displayed brittleness, breaking after 8,000 actuations. To improve reliability, we propose using brass for complicated shapes instead of tungsten. This approach reduces weak points and allows easy machining. Our current project involves retrofitting existing tungsten petals to a 2mm brass backing plate, which has shown positive results. More machinable tungsten is on order for further enhancements.

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Enhancements in Tungsten Petals for Diffusers: Brass Solutions for Durability

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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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