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  1. Bob_3

    Miami/Dade County product approval

    Hello, I'm in way over my head as I've been asked what it will take to get our product (metal/plastic fasteners)code approved in south Florida. I am a mechanical/manufacturing engineer and have no idea what building codes might be? I've found that the codes and test standards are a rabbit hole...
  2. Bob_3

    1000 hr salt spray coating

    We have some components that need to meet a 1000 hr salt spray test. Anything thicker than a G90 hot-dipped zinc will make the part not function in use. Other than redesigning the part to accommodate a thick coating, is there any alternative to hdg for a low cost thin coating that will pass...
  3. Bob_3

    rubber coated metal gasket

    Hello, Does anyone know of a brand-name or supplier of a rubber/metal shim/rubber type of laminated gasket material? I've seen them many times but don't know what that type of sandwich is called. Thanks...
  4. Bob_3

    EMI from forklift charger

    Hello, We have a benchtop engraving machine that was stalling and was erratic sometimes. We narrowed it down to EMI from a forklift charger on the other side of the cement block wall. This unit is supposed to run on 120V single phase, and this is a 60+ year old building that's running 123V...
  5. Bob_3

    Costs of Painting versus Grit blasting

    We currently have some aluminum die castings that are painted silver after machining solely for appearance. We're thinking it might be a cost reduction to grit-blast instead of painting as the end result would look similar, and in use the paint wears off in a short time anyway. Parts would...
  6. Bob_3

    loctite adhering to aluminum

    Were having issues with steel to aluminum loctited assemblies coming loose. Normally they'll withstand 40 ft-lbs. of torque, but when they fail, it's only at 5 ft-lbs. We clean and rinse parts, and use primer and #638 retaining compound for strength. When we take the failed assemblies apart...
  7. Bob_3

    Grain direction of sheet steel

    We have some sheets of S7 material and are unsure of the grain direction. Is there an industry standard which way the stencil lettering is oriented in relation to grain direction? Please see the attached photo, where all the smaller sheets have a constant W width, and vary in the L length...
  8. Bob_3

    case-hardening C-1018 versus A36

    Would there be a difference in hardening response to nitride case-hardening C-1018 versus A36? C1018 has a carbon range of .14-.18% whereas A36 is < .25%. Thanks...
  9. Bob_3

    Non-destructive measurement of case depth

    Has anyone had any success using ultrasonic (ASTM A1038) or Leeb hardness (ASTM A956) measurements for case hardened steel? Not just the hardness measurements, but we're looking for an indication of case depth. Thanks...
  10. Bob_3

    Case hardening steel processes

    I’m looking for some help with case hardened sheetmetal parts. We have some failed sheet metal parts – 1mm thick C-1018 steel – that have cracked in the corners, and I suspect a change in the process from a matte black Nitrotec (nitrocarburize) to some other hardening process may be the cause...

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