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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

    EB Welding Nickel Alloy 718

    Good Afternoon Kingnero, All of our welding with the EB Machines is autogenous - no filler added. To follow up on MG1983's comment, the concept was broached of adding another alloy (a thin 625 washer) into the weld to aid with liquation cracks. Apparently this has worked in other assemblies...
  3. acspain

    EB Welding Nickel Alloy 718

    Hello MG1983, Thank you for your reply. We ended up conducting a series of experiments that could be characterized as an fast informal DOE which in turn provided us with relationships between the various inputs. The solution ended up being a series of steps including preheat, root weld...
  4. acspain

    How to Reduce Hydraulic Pressure Variation?

    Good Morning LittleInch, Yes, I am going to find a valve and add a circuit to enable the pump to continuously move fluid. Then when the solenoid switches and siphons off the small amount of fluid needed, the pumps reaction is going to much smaller and therefore the pressure variation should...
  5. acspain

    How to Reduce Hydraulic Pressure Variation?

    Good Morning All, PNachtwey - I completely agree with your last statement "chances are it has been done before or something very similar" which is why I am here on this forum. But all of us are aware of the challenges with lack of documentation, sharing of knowledge and the inability to find...
  6. acspain

    How to Reduce Hydraulic Pressure Variation?

    Stick and hydtools - The end application for the bellows is a component in a larger hydraulic/pneumatic system hence the use of hydraulics for development testing. I was aiming for a .300 to .350 inch stroke. The component is in a pressure chamber so limit switches would need to be...
  7. acspain

    How to Reduce Hydraulic Pressure Variation?

    LitteInch, The pump runs continuously. What I am calling a regulator adjusts the plate angle in the variable piston pump. I am told the pressure relief valve is set to 1500 psi, which means it is staying closed and serving as a system safety valve only. Requirement is to test the part with...
  8. acspain

    How to Reduce Hydraulic Pressure Variation?

    Hello All, Thank you all for your input it is appreciated. LittleInch - I ruled out an accumulator as it would reduce the variation but probably not to the level I want. Solenoid is controlled via a pair of timers and automated switch/cycle counter. TugboatEng - Yes, I am quickly finding out...
  9. acspain

    How to Reduce Hydraulic Pressure Variation?

    The setup is not that sophisticated. The pump/motor is an independent setup that I don't believe we have access to or can change. What I am looking for is a hydraulic component that I can add to the circuit in order to modify and/or steady the pressure supplied to the part.
  10. 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...
  11. 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...
  12. acspain

    Engineering with Magnets Book?

    Thank you MagMike! Very helpful.
  13. 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...
  14. acspain

    Very High Temperature Bearing?

    Thank you to all for your posts. Graphalloy is definitely a possibility for the application. Does anyone have experience with tolerancing rings to deal with the difference in thermal expansion between ceramic and stainless steels? Have a good day!
  15. 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...
  16. 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...
  17. acspain

    Lip Seal Damage

    Water and rotating shaft seals don't mix. Water has very little lubricity to reduce lip seal wear. The seal is probably sticking to the shaft where water precludes the oil and pieces are being torn out when the shaft rotates.
  18. acspain

    Bandsaw blade and its failure mode

    Your question is bouncing around in my head so I thought I would share. I have used three different saws, a wood shop vertical saw with the band loaded via a die spring, a wood mill saw (creating boards from logs) whose band is loaded by a bolt and the horizontal weighted metal saws (unclear...
  19. acspain

    Part-time and/or volunteering opportunities?

    Look for a First Robotics Team in your area. There may be a need for mentors and although it is not civil engineering it is still problem solving and you get to promote engineering to high school students.
  20. acspain

    Stretch material

    Kerrie, 1. Elastomers are non-linear materials. 2. Elastomers will lose properties after each stretch however the loss will decrease with each subsequent stretch. If you can live with the above two items then silicones may work. There may be other materials but you will probably have to speak...

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