Paging Mueller, Bowlsby, Bleyseng and Jaroen Options

[r_towle]

Hi guys,

Through a local DOD contractor I found a few small shops that will make Berillium Diaphrams...

Apparently the new fighter jets use alot of the material, so they are set up to work with it, and do small runs...

So , what I need, to get a price, is CAD drawings of the diaphram, and the piece that gets pressed into the middle..

I have been told that they can do it, based upon my description.

So, did anyone ever make a drawing of the diaphram...or maybe please......mike...could you...

Rich

[Bleyseng]

QUOTE (Demick @ Jan 13 2006, 07:38 AM)

QUOTE Your estimate was about 5K cheaper than I thought...I was trying to get a contact in China to make them...but the funding issue killed that idea....... Here's what I wrote sometime last year on the subject: QUOTE The material for the diaphragms is most likely beryllium copper (BeCu). Not really exotic, but is environmentally hazardous to process. Companies like Laird buy it by the ton to make EMI gaskets out of. The material is not really the problem - it is the cost of the tooling to have the correct shape for the diaphragm stamped out. Then the low volume once you've got the tooling paid for. It really all comes down to money. Figure $2K for tooling, and then around $50 each to buy them in low quantities like 25/batch. Then you've still got to have the center boss machined and pressed into the diaphragm - a little more in tooling to create the tools that will press and flare the boss into place. So figure a cost of $100 each for a complete diaphragm. Then you've got the labor to rebuld the MPS, some extra profit to pay off tooling. It all adds up. Hard to justify when you can still get used MPS's for $100 or less (last ones I bought were $15 each at a swap meet). This is all even harder to justify when you can buy a Brett Instruments rebuilt unit for just over $200. Some people have complained that the Brett diaphragms are the wrong material and don't have the right response. But my opinon is that the diaphragm response is not all that critical. Sure, it need to be close, but not exact since it only provides the transition from part load to full load enrichment. It's the aneroid cells that are most important in their response and how they expand - not the diaphragm. Demick

I disagree......crappy stiff diaphrams make the mps transition response shitty or worse a off/no type. Aneroid cells in for altitude differences I thought although early type 3 MPS don't even have a diaphram!