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Recent content by BrianE22

  1. BrianE22

    How do I calculate forces and moments for this gripper

    If you want to make it more difficult, consider what happens if any moment arm gets small (shortens) during part of the stroke. You would want to make sure the tolerances were tight enough not to affect the moment arm lengths.
  2. BrianE22

    Digikey Alternatives

    Digi-key often offers parts via different packages like "cut-tape" and "full reel". Maybe you only saw the "full reel" part number? Added: Some products can be had on the manufacturer web site via a special "samples" page.
  3. BrianE22

    Why do some metals damp so well?

    So EdS - the hysteresis you are referring to is the stress/strain loop and the area enclosed by the loop?
  4. BrianE22

    Why do some metals damp so well?

    Cast iron damps real well. Aluminum rings and rings. What causes damping in metal materials?
  5. BrianE22

    How to optimally transfer potential energy from a large mass to accelerate a small one upwards.

    Wouldn't a teeter totter do what you want?
  6. BrianE22

    Computer Program that can block/pass phone calls

    We're going crazy in our small office/assembly area with the unwanted spam or junk phone calls. What I'd ideally find would be a COTS program/electronics package that I could add to our 3 computers. I'm sure I can't find anything with all that I'd like so maybe I hire an engineer to build and...
  7. BrianE22

    Threaded Connection of Aluminium Components

    I'm confused on the fastener being aluminum or steel? We've fastened aluminum parts together with zinc plated screws for >60 years. I've not seen one come back loose. If you plan on disassembly and reassembly then use inserts and/or thread lubricant.
  8. BrianE22

    DIY Strain Gauges

    Look at Micro Measurements. Years ago they sent me a very comprehensive binder of their gauges and tutorials on strain gauges.
  9. BrianE22

    Bearing Placement Advice

    Do you need to accurately hold the sheet metal pieces together during rotation? If so then you'll probably need at least one bearing. Does the center bolt need preload only to keep the nut from falling off? If so then a shoulder bolt and nut would probably be enough.
  10. BrianE22

    Aluminum 7075 - T6

    Did you watch the assembly or do it yourself? Perhaps something was off and a lot of stress induced during the assembly.
  11. BrianE22

    Example of using notching to suppress vibration

    I think you want a notch filter. Piezos are generally good at high frequencies (high output) and not so good at low frequencies (low output). I don't think you want to build a notch filter with them. Are you looking to filter a "drive signal" for a test rig? When I did this kind of stuff...
  12. BrianE22

    high vibrations in pd pump, gearbox, motor combo on movable base

    I assume there's a flexible coupling between motor and gear box?
  13. BrianE22

    How to figure out the duration of use before refill on a compressed air tank

    What minimum and maximum pressures for the tank are you dealing with?
  14. BrianE22

    Easy way to fix binding?

    Spherical mounts for two or three of the actuators and piston rods may help.
  15. BrianE22

    replicating an old circuit- unexpected voltage drop

    Thought of another one I've messed up before: Are using a ground plane on the PCB? If so, you don't have AC low connected to DC low, correct?
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