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  1. ddddarkbull

    Spring mounting hardware

    I am looking for COTS hardware that can be used to mount 2 extension spring side by side through a steel plate between the 2 springs. The springs are parallel to each other. I hardware should be fixed at the steel plate. I have hard time to find any from internet search. The extension spring...
  2. ddddarkbull

    Air compressor blown head gasket

    We recently received many returned compressors with blown head gasket problem. Open up the head block revealed some of the valve plates are distorted. Any idea what are the possible cause of blown head gasket and distorted valve plate. Info of the air compressor: Reciprocating type with...
  3. ddddarkbull

    IDC connector

    I would like to know if IDC(insulation displacement connector) connectors are approved for aircraft application. Appreciated.
  4. ddddarkbull

    Light blocking material

    What is the best light blocking plastic material which can block as much light as possible. The material can be as thin as 0.020" (or machined to this size). We used black plexiglass before but when it go down to this thickness, light start leak through.
  5. ddddarkbull

    PCB packaging arrangement, Connector search

    Hope someone can help with this. I have an application to connect 4 circuit boards together through some board-to-board connectors. The boards arrangement is shown in the attached file. The cards are located inside the avionic box with front panel attached to PCB 1 and the real chassis attached...
  6. ddddarkbull

    Board to board connector search

    Hope someone can help with this. I have an application to connect 4 circuit boards together through some board-to-board connectors. The boards arrangement is shown in the attached file. The cards are located inside the avionic box with front panel attached to PCB 1 and the real chassis...
  7. ddddarkbull

    Selecting finite element software

    I am looking for a finite element software for dynamic, static as well as fatigue analysis (linear, non-linear, random, sin, combine random and sin, shock). Our products are typically electronic boxes (MCU) for aircraft application. Ideally, it should be easy to use for analyzing vibration...
  8. ddddarkbull

    Circuit board vibration analysis

    Any experienced vibration analyst can provide me with the analysis procedure to determine if a complex circuit board assembly (i.e. has different mix of component types) will survive a given level of vibration level for aircraft application? Please assume the circuit board spec (e.g. component...
  9. ddddarkbull

    Jog dimension

    I have been using Pro/E for a while and now have to switch to Solidworks. During the training session, there was a question raised about creating Jog line for dimension (see attached). The instructor said there is no known way in Solidworks to create that. This is quite surprised me. I like...
  10. ddddarkbull

    Circuit board assembly vibration analysis

    I got this project to perform vibration analysis for an electronic equipment used in the aircraft. Inside this equipment, there are stacks of circuit board. These board has mix of surface mount as well as through hole components. The analysis will pin point if there is any problem in the...

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