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  1. Alfninux

    What kind of actuator/control?

    Minimum bending radius 35mm. Regarding the maximum strenght, it could withstand enough to be rolled in the small spool with a single motor just by dragging it. The problem is that this affects some particular property of the fiber. That's why I would like to build a DIY machine able to unwind...
  2. Alfninux

    What kind of actuator/control?

    I don't care too much about the winding method. From a spool of several Km I need to realise small spools of about 100/200 m with an axial lenght of the spool of around 10 mm. The question is: if I use two motors (one at a constant speed to the big pay-out spool and the other one at a constant...
  3. Alfninux

    What kind of actuator/control?

    Hi everyone, I would like to realise simple mechanism in order to make smaller coils of optical fibre starting from a bigger coil. The idea is to use two bearings in order to facilitate the rotation of the two coils. The problem is that I don't want to actuate only the little rising coil...
  4. Alfninux

    Adjustable damping effect

    Honestly, this is a pretty incomplete question. If you have some application in mind, perhaps we could tell you why it's desirable for that application. Otherwise, it's kind of like asking why red paint exists. Sometimes, you want to paint something red... (handleman) A possible application can...
  5. Alfninux

    Adjustable damping effect

    I'm talking in general. Not only automotive applications. One of the main requirements of semi-passive dampers is that the damping effect can be activated or de-activated when required. I didn't get why sometimes is required to have a damping value set to zero...which is the advantage?
  6. Alfninux

    Adjustable damping effect

    Hello, what are the advantages of having an adjustable damping effect? I mean, in case of semi-passive dampers, it is possible to adjust the damping effect so to work in different conditions. Why is it good to have the possibility to modify the damping effect (the damping force)?
  7. Alfninux

    Best rubber-like materials for plastic friction dampers

    If I want to realise a passive damper in PLASTIC (like ABS) in which two cylinders slide the one with respect to the other, and between their surfaces I want to place a ring-like POLYMERIC element to dissipate energy by friction, which kind of polymer would you use?
  8. Alfninux

    Best rubber-like materials for plastic friction dampers

    Hi everyone, I'm looking for some good rubber-like materials to use in a Friction Dampers/Shock Absorbers as the ones used in washing machines. I would like to know what materials is usually implemented to generate friction in these kind of systems, which kind of rubber? If there is one very...
  9. Alfninux

    QUALITATIVE Torque calculation

    I want to impose a motion to the internal bushing (angular motion 0° to 90°). In a given angle it touches and then deforms the "deformable element" until it reaches the desired 90° rotation. I would like to get the required torque to perform that motion. What kind of analisys should I perform on...
  10. Alfninux

    QUALITATIVE Torque calculation

    Which STEP should I use to run it on ABAQUS? Dynamic,Explicit?
  11. Alfninux

    QUALITATIVE Torque calculation

    Brian Petersen. Based on your experience. What do you advise?
  12. Alfninux

    QUALITATIVE Torque calculation

    In case I want to perform a FEA before building a model, which software would you advise to be used? (I'm looking for some simple software, because in a first approximation I don't need accurate results).
  13. Alfninux

    QUALITATIVE Torque calculation

    Sorry. I wasn't so clear. For "qualitative" I meant that I don't need a precise number but a good procedure to understand more or less the amount of required torque. The deformable part is an elastic element (rubber-like) and it deforms just elastically. I'd like to know (in the case I have to...
  14. Alfninux

    QUALITATIVE Torque calculation

    Hi everyone. I've a question related to the QUALITATIVE computation of the required torque to make a rotation. The image shows a cross section. Two rigid bodies (hollow cylinder and elliptic base cylinder) and a deformable element are shown. Supposing to know all the mechanical properties...

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