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  1. rocketscientist628

    Fastener retention while starting into deep cavity

    Does anyone know of a tool (other than magnetic) that will hold a #6 pan head torx bit TAPTITE (thread forming screw)while it is installed into an approximately 4 inch deep housing using an electric torque driver? These fasteners are used to restrain a PCB into the housing, so whatever used...
  2. rocketscientist628

    Corrosive properties of Stainless Steel contacting aluminum 6061

    Can someone tell me what the galvanic difference is between the stainless and aluminum 6061-T651? I'm not sure what grade the stainless is, as I've been unable to find that also, but the screw is NAS1352C02-5. This replaced MS16997 which was a cadmium plated screw, however, I don't know...
  3. rocketscientist628

    Corrosive properties of Stainless Steel contacting aluminum 6061

    Yes, the hardware will be exposed to a marine environment per Mil-Std-810. I'm considering sealing the fastener using possible combinations of sleeves and inhibiting sealants, however, I would prefer a different solution. I would prefer going to another type of fastener, but haven't found much...
  4. rocketscientist628

    Corrosive properties of Stainless Steel contacting aluminum 6061

    During some recent "re-work", a fellow engineer at our company discovered corrosion on stainless steel screws that were removed from threaded holes that were tapped in aluminum 6061. MOST all of the hardware we build is machined out of 6061, and most ALL the fasteners we use are stainless...
  5. rocketscientist628

    Obtaining Shock Pulse Input Data from Shock Response Spectrum

    Thanks for your help guys! I've come to the point that I'm going to have to either ask the customer for clarification or iterate using various input values and see what SRS I get. The main difficulty with doing this is that the SRS that I have been given by the customer is a "pseudo-velocity"...
  6. rocketscientist628

    Material compatibility / Dissimilar Metal references

    Could anyone recommend a straight forward reference that can be used to obtain material compatibilities for metals? I have Mil-Std-889, but find it very confusing.
  7. rocketscientist628

    Obtaining Shock Pulse Input Data from Shock Response Spectrum

    I need some help determining how to convert from a Shock Response Spectrum plot back to the appropriate Shock Pulse level and duration. The customer spec. contains a four coordinate plot which I think is called a Fourier/Pseudo-Velocity Spectrum. This plot shows the "pseudo-velocity" on the...
  8. rocketscientist628

    Effects of Isoprep 35 (Caustic Etch) on Aluminum 6061

    Thanks very much for your reply! My main challenge is selling this idea to program team members that need to be convinced that the aluminum 6061-T651 will not be harmed in any way. The concentration of the isoprep 35 when I did the samples was between 7.7 oz/gal and 7.2 oz/gal. I maintained...
  9. rocketscientist628

    Effects of Isoprep 35 (Caustic Etch) on Aluminum 6061

    I am experimenting with using caustic etch to aid with deburring some otherwise difficult to deburr parts. This has yielded some encouraging results, but I need to know if there will be any effects on the material properties. Our manufacturing procedure calls for on a one minute soak (max)...
  10. rocketscientist628

    Deburring

    I am currently composing an MP on deburring brazed waveguide components. In doing this I need a conclusive definition of what a "burr" is. Does anyone know where I might find a formal definition for "burr"??

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