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  1. israelkk

    Spring setting

    MikeHalloran Even as static spring it it is not valid or sound design. This is why I try to ask questions to get the proper requirements before final check. I am sure Jh0an1 will do the most effort to answer my questions. I mentioned static because he defined only one deflection case of 6 mm...
  2. israelkk

    Spring setting

    When you ground do you mean Sguared & Ground? Can you send a picture/drawing of the spring? When you say 6 coils total do you mean 4 active coils? If yes it is Squared & Ground. Otherwise, it will be less than 4 active coils.
  3. israelkk

    Spring setting

    One more question, in your first post you mentioned that the spring will be compressed to max deflection. Do you mean to a length of 26.5 mm. The solid length of the spring is 15 mm (6 x 2.5). Why the extra 13.5 mm? You like to pay for useless wire? What will happen if by mistake it will be...
  4. israelkk

    Spring setting

    More questions? Why free length is important? It is best to give at least one point of load at compressed length of the spring. For example: At compressed length of 26.5 mm the load should be xx.x +/-10% or minimum xx.x maximum yy.y. I assume the spring is in static operation pressing a desired...
  5. israelkk

    Spring setting

    I would like to add that with proper designed spring you can gain between 30% to 60% more load from same spring (i.e. same No. Of active coils, same wire diameter, etc,). All the cased the previous post refer to were to spring set as a secondary operation to stabilize the spring against...
  6. israelkk

    Check valve

    The problem with check valve is to assure exact return of the poppet every time, which is almost mission impossible. When you have a large force due to the 10000psi pressure it may force the poppet into place or even deform the seat for a new sealing area. However, when the pressure is low it...
  7. israelkk

    Check valve

    jbeckhou The problem is to work both at 10000psi and low pressure. From my understanding the gas pressure assists the spring to create the seal force. Therefore, 10000psi creates enough brute force to seal (probably metal to metal seal) but when the pressure is low the part of the gas pressure...
  8. israelkk

    Check valve

    The word design is used too liberaly. Many think that if they created a 3D model of the products or even exact manufacturing drawing with all dimensions correctly defined including surface finish, special coatings they finished a sound design. Life shows differently. Just creating parts from...
  9. israelkk

    Check valve

    It either work over the whole spec or not, if not, it is not a working product. How you can be sure that if it will work in these prototypes it will work every time you manufacture from a new batch of materials even from different material manufactures. Or a new batch of seats with the...
  10. israelkk

    Check valve

    What do you expect without giving your design and calculations to check?
  11. israelkk

    Positive Material Identification for elastomers

    Identifying rubber is an art. You can burn a piece and see and smell it and differentiate between them. I used to work in for Military & Aerospace company where there was a lab and experts that by very simple techniques could tell the difference, Sure, there will be cases that more accurate...
  12. israelkk

    calculate width of Teflon lead nut for silent actuator

    From you questions I have doubt you are in a position to handle this task. I do not know your experience and skills but your question indicate that you either not a professional engineer or very inexperience. What kind of M12 rod are you using? If it just standard that the thread is not...
  13. israelkk

    calculate width of Teflon lead nut for silent actuator

    What did you expect to get and what you got? The nut width has nothing to do with the friction it will only need to be able to carry the 250N load. I.e. the number of threads has to be strong enough to work with the 250N load as long as needed. I assume you used the 0.1 friction coefficient. But...
  14. israelkk

    Speed up heavy lifting jack operation

    Start by calculating the current system and very that what you get is what the calculations show. Then it will fairly easy to choose the correct components to achieve the 10 sec goal. You may be fined that it is not possible with electrical system if you have space restrictions and/or current...
  15. israelkk

    O-Ring Groove Design

    If "Leaks are super critical in this application" then using O-rings is not the solution to my best judgment. There is also a gas permeation through the rubber seal. You should may go with all welded sealed metal bellows designed for 10000psi and the movement and forces and life cycles.
  16. israelkk

    Compressible air flow into chamber over tube and valve

    What are the high and low pressures and temperatures? Are there requirements for actuator movement time to both directions and the loads. Why are you discharging the cylinder to a volume?
  17. israelkk

    Compressible air flow into chamber over tube and valve

    Is this s homework problem?
  18. israelkk

    Predicting Tensile Strength

    I assume Boeing has a minimum shear load the pins has to stand. Therefore, you have to show that at minimum material condition (smallest OD with Largest ID) the pin will hold at the minimum UTS of the source material at the required heat treatment given by the material spec. Statistics to my...
  19. israelkk

    Predicting Tensile Strength

    What puzzles me it that you should have the spec. the 15-5PH is purchased tO. The spec gives the minimum UTS and Yield. You should do your calculations based on these values. The tests Boeing asks for to my best 40 years of experience in the area is to see that the pins material properties were...
  20. israelkk

    O-Ring Groove Design

    I would like to add to hydtools that metal-to-metal is for face seal only to my best experience. For piston grove seal you will need more than just harder seal and anti extrusion component. Usually such details are not available freely. These are company's (or experts) propriety knowledge. 1...

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