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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

    EMI from forklift charger

    Hi All, Thanks for the feedback, and I thought I'd give an update. First we just tried to schedule the forklift charging to off times from the engraving, but a better filter was needed too. The UPS helped a little, but but was really needed was a filter with more attenuation. The Furman unit...
  4. 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...
  5. 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...
  6. 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...
  7. Bob_3

    Recommendations for 3D printer

    Josef, You should also look at product specs, namely nozzle diameter, and as mentioned, material choice, to get what you're looking for. Some of the units cited here may be better suited for hobbyists, and others are more geared towards professional use. I think the adage "You get what you pay...
  8. Bob_3

    Recommendations for 3D printer

    We just got a Dremel 3d45 FDM machine and I can't believe how well this machine works. https://digilab.dremel.com/products/3d45 The cost is roughly $1900 US, and it takes PA, ABS, & PET materials, the tolerance seems typical for this type of machine although I haven't really run it through it's...
  9. Bob_3

    loctite adhering to aluminum

    These are threaded assemblies with no abutting shoulder to induce tension, so we rely on loctite only. As stated earlier, #638 was chosen for being far and above the highest strength. Yes, it is more viscous, and the gap filling capabilities rate at .010 in, but that is the maximum gap, not...
  10. Bob_3

    loctite adhering to aluminum

    Thank you all for your comments, so here's an update to what we've been able to find out. It seems our overseas supplier is applying a corrosion inhibitor to the aluminum parts since they sit on the water for a month, so the loctite won't cure properly in the presence of nitrates. The short...
  11. 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...
  12. Bob_3

    Grain direction of sheet steel

    Thanks Ed!
  13. 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...
  14. Bob_3

    case-hardening C-1018 versus A36

    Thank you for the feedback. Yes, I'd likely overthink it, but I suppose that's what we all do...and why these forums are so nice to have an on-line peer review. But I came here for answers and I got them. I guess it comes down to the classifying bodies calling essentially the same material...
  15. Bob_3

    case-hardening C-1018 versus A36

    Here's the compositions I found: A36 Carbon, C <= 0.25 % Copper, Cu 0.20 % Iron, Fe 98 % As Remainder Manganese, Mn 1.03 % Phosphorous, P <= 0.040 % Silicon, Si 0.28 % Sulfur, S <= 0.050 % 1018 Carbon, C 0.14 - 0.20 % Iron, Fe 98.81 - 99.26 % As remainder...
  16. 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...
  17. Bob_3

    Chart for benefits to heat treating tool steels

    You should look at the steel suppliers websites and look for hardenability curves and such. https://files.engineering.com/getfile.aspx?folder=9ec352c7-e75a-4f0d-b1e8-e87cd6900d49&file=a1.png
  18. Bob_3

    Non-destructive measurement of case depth

    And I stand by my statements. Investigate the problem and hypothesize. Anticipate needs. Samples being evaluated by a lab. Samples be sorted by apparent differences. Short and long term solutions developed. Hypothesis verified. Short and long term solutions implemented. There are 6 or 7...
  19. Bob_3

    Non-destructive measurement of case depth

    I think this is a great example of trying to fix the problem before you understand what is wrong. Be interested to find out the result of the metallurgical examination. I never said I was trying to fix. I said I was trying to sort.
  20. Bob_3

    Non-destructive measurement of case depth

    Thanks all for the replies. You've given me some things to look into. Have you had the case depth measured on one of the cracked parts to see what the case depth is? It doesn't really help being able to sort if that is not the root cause of the problem. We are having this done as I write, but...

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