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  • Users: acspain
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  1. acspain

    Pump Search - Small, Manual, Positive Displacement

    Good Afternoon All, Can you suggest a Small (single digit cubic inch, about 60 psi capability), Manual (tight control on volume), Positive Displacement pump? My target right now are catheter inflation pumps as they meet the requirements above but since they are considered medical devices it...
  2. acspain

    How to Reduce Hydraulic Pressure Variation?

    Hello All, What should I add to the hydraulic circuit to reduce the pressure variation? We are running an endurance test of a component using hydraulic pressure ideally ramping from 0 psi to 1030 psi and back to 0 psi over the course of 30 seconds to complete a cycle. The peak pressure is...
  3. acspain

    EB Welding Nickel Alloy 718

    Good Morning All, Do you know of a resource that connects EB Welding parameters such as focus, milliAmps, speed, etc. with weld shape and size? I understand that the above is likely to be machine dependent and have reached out to the manufacturer as well. We have significant experience EB...
  4. acspain

    Engineering with Magnets Book?

    Good Morning All, Does anyone have a suggestion for a book that would detail how to design with magnets? I am most interested in magnets that are not electro-magnets. After 20 plus years of engineering experience, I need to design a simple fixture using a magnet to measure the motion of an...
  5. acspain

    Very High Temperature Bearing?

    Good Afternoon, We need help in selecting an appropriate bearing technology for an application. We don't have a complete specification yet and can design around the bearing choice. The basic criteria is 900 F temperature, 3 rpm max, 100-200 revolution life over course of 5 years. Output...
  6. acspain

    Metal Bellows FEA - Squirm/Flip

    Hello Everyone, We are trying to solve a couple of problems (with FEA) that occasional occur with welded metal bellows. One is called squirm (a type of column instability caused primarily by ID pressure) and flip (where a convolution of the bellows changes orientation during loading (pressure...
  7. acspain

    Wrinkled/textured metal surface after test.

    Hello all, Upon testing some electro-polished metal test specimens, axially and in tension, the smooth electro-polished surface changes dramatically to a wrinkled or textured surface, why? I can't seem to find anything that explains this effect on the internet, including academic papers and...

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