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  1. Aconcagua

    Can flexible hydraulic lines handle external pressure?

    As far as pressure I can work with, it will be generally balanced with ambient pressure (up to 9000 psi). I assume there will be a limit to the relative pressure I can generate and still flow through the line. I am also assuming it will have little to do with absolute pressure.
  2. Aconcagua

    Can flexible hydraulic lines handle external pressure?

    Thanks everyone for the replies! Yes, it is an oil filled line. I can use electrical actuation to generate negative relative pressure in my line. Maybe a supply line is the answer, I was just hoping to avoid extra lines.
  3. Aconcagua

    Can flexible hydraulic lines handle external pressure?

    I am considering a potential two way hydraulic system for a subsea environment. I should be able to take advantage of the high ambient pressure to drive in either direction, though my flexible hydraulic line must be able to handle external pressure for this to work. I am not experienced...
  4. Aconcagua

    What are the major differences between cheap and expensive bearings?

    Can someone tell me what differences you can expect between expensive bearings (SKF) and cheap bearings (VXB)? I would imagine running life, but is that generally load or speed, or some combination that is causing this? Are there some types of bearings you wouldn't skimp on, while others it's...
  5. Aconcagua

    Best type of spline for misalignment and easy engagment

    Thanks! That's a good idea. A little more specs on this spline. It will have a very low duty cycle, and when it's loaded it will generally be stalled. It's also subsea, so my plan is to Xylan the female part.
  6. Aconcagua

    Best type of spline for misalignment and easy engagment

    I have a tool that will be engaging with a motor. The spline to transfer torque between the two is 1/2" diameter, and only needs to carry 18 Nm, so I'm not overly stressing it. It might not engage perfectly straight and it might not align perfectly well. My plan is to use a hex spline with...
  7. Aconcagua

    Subsea Materials Selection for Production Equipment vs ROV

    Hello - I am designing some equipment that will go on an ROV. I am interested in the best materials selection guide for it. I know of the EEMUA 194, but I wanted to make sure it is useful for ROV equipment before I buy it. I assume that periodically submerged equipment like ROVs have less...
  8. Aconcagua

    Non-cylindrical Dynamic Seal?

    No, I don't have space for two cylinders, and it is double acting. I realize I could have a anti-rotation feature and then a cylindrical seal (in series), but each requires a full travel length of length added onto the actuator. I maybe able to use a keyway and a wear ring, because it probably...
  9. Aconcagua

    Non-cylindrical Dynamic Seal?

    I'm very space constrained on this and I was hoping that I could forgo another alignment feature.
  10. Aconcagua

    Non-cylindrical Dynamic Seal?

    I am designing a linear actuator. I would like a dynamic seal between the piston and the bore (IP66), but the piston will have some torque on it as it slides, so a cylindrical design won't necessarily stop it from rotating. Putting a flat on the piston would stop it from rotating, but I'm not...
  11. Aconcagua

    Shear pin design questions

    Oh, and any particular material that seems to break more predictably?
  12. Aconcagua

    Shear pin design questions

    Thank you both. EdStainless- How close were you able to get your breaking load to your designed breaking load? I mean, if you build a jig and iterate on the radius, how close can you expect to get reliably? And if you don't test, but just rely on best design practices, how close could you...
  13. Aconcagua

    Shear pin design questions

    Hello - I am designing a shaft coupling that needs to be able to handle 2200 Nm under normal operating conditions, but I would like it to break at around 3500 Nm. This device will have a long life, but it will only be operated up to 1000 cycles total so I'm not expecting fatigue to play a big...
  14. Aconcagua

    Sliding spline design in linear actuator

    Thank you everyone for the help. I'm thinking that the external spline will only be about 1/2"-1" in length. That is 10-20 times larger than it needs to be to take the torque, but I'm thinking it might be smart to not go too short so that the face to face compressive pressures don't get too...
  15. Aconcagua

    Sliding spline design in linear actuator

    Thanks for all the advice! I will reach out to some gear cutting shops and see if they have that capability with a shaper. As far as the pressure angle goes, are you suggesting I move to a 45 degree? Because of some diameter restrictions I have pretty thin walls on the internal gear. I care...
  16. Aconcagua

    Sliding spline design in linear actuator

    Well right now I need a long (~7") internal spline. There is a possibility that I could create the part in a way that allowed me to EDM those internal teeth. That would leave a short external spline. Is that your concern?
  17. Aconcagua

    Sliding spline design in linear actuator

    Thanks for the reply Yes it needs to slide while opposing the torque. The 20,000 in-lb should be only to overcome initial stiction, after which it should drop by half at least. The axial travel is 6 inches. I can afford to lose a substantial amount of force due to spline friction...
  18. Aconcagua

    Sliding spline design in linear actuator

    Hello - I am designing a linear actuator using a relatively large (60mm) roller screw. I am driving the screw and the output is attached to the nut. Obviously I need to oppose the torque that the screw imparts to the nut so that I get the desired linear motion/force. I don't have a lot of...

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