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  • Users: rnd2
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  1. rnd2

    soldering 304L st/st to copper plumbing pipe

    We always used minimum 45% silver solder for braise-welding copper pipe to stainless steel. The flux was a liqid-paste containing borax and flouride compounds. As I recall the brazing temp was about 600 deg. C. The application was to pipe oxgen gas at 2,000psi. Fortune favours the bold and...
  2. rnd2

    PTFE machining properties

    Machining PTFE is a black art and those that know rarely divulge their hard won knowlege for free. We sometimes make seals from PTFE but generally avoid using the stuff. It has a low modulus, low resilience, practically no compressive nor tensile strength and because it has high thermal...
  3. rnd2

    Stainless Blades

    nornrich in addition to the information supplied by unclesyd. I strongly suggest you look at the Kolsterising process or one of its clones. Choose 316L or a duplex type stainless, but preferably a ss with plenty of chrome, and Mo. The process allows carbon to form carbide compounds with Fe and...
  4. rnd2

    Polymer capable of steel/aluminum strength with same thickness ?

    Could this be he? Electro Adapter Sales Reps NJ, Tom Saxe Electro Adapter, Inc. 20640 Nordhoff Street Chatsworth, CA 91311, Tom Saxe, Ph: 818.998.1198 Fx: 818.709.5773 TSaxe@electro-adapter.com ... www.electro-adapter.com/website/eacrepdata/rep.cgi - 14k - Cached - Similar pages Fortune...
  5. rnd2

    Polymer capable of steel/aluminum strength with same thickness ?

    My project is a rectangular box of sorts that will be injection molded and I need to know what polymer will give me the equivalent properties of 1mm of steel or aluminum. I know that in most cases a "thicker" polymer is used to make up for the loss of strength. This is not an option for me. I...
  6. rnd2

    Functional or chronological resume?

    When you send your resume in, assume at least three people will expect a copy. Send in three clearly separated, but original copies. That way you may just have the little edge needed.
  7. rnd2

    Ball/roller temperature

    "........Although the ball diameter is much smaller than the ring radius, its contribution to thermal problems could be also signaficant due to higher temperature. This way I explain to myself the superiority of oil-air lube in high-speed applications." Assuming other factors to be equal and...
  8. rnd2

    Acetone Extraction Test on Phenolics

    Part cured phenolic resin dissolves into most alcohols and acetone is one of the more agressive solvents. We use acetone only for cleaning solvent. To test a phenolic part for cure, we rely on a special hot compression test developed in-house. Properly cured and partially cured phenolic resin...
  9. rnd2

    Acetone Extraction Test on Phenolics

    I would also like to say that while acetone may be useful for extracting unreactants, over time and above acetone also attacks perfectly cured phenolic. IMO it is a destructive test therefore the test part should be isolated from and not returned to the batch.
  10. rnd2

    Acetone Extraction Test on Phenolics

    'Standard Test Method for Acetone Extraction of Phenolic Molded or ... This test method covers the determination of the amount of. webstore.ansi.org/ansidocstore/ product.asp?sku=ASTM+D494-04 - 23k - Cached - Similar pages D494-04 Standard Test Method for Acetone Extraction of Phenolic ... 1.1...
  11. rnd2

    Galvanising protection

    It may be just as practical to ream them after galvanising.
  12. rnd2

    What is the best engineering advice you ever received?

    Another take on TheTick's superb quote: "Decision is clean cut, easily mended, blended, repaired or removed. Indecision is ragged edged with loose threads and jams everything associated with it.
  13. rnd2

    Attaching metal brackets to carbon fibre layup

    As long as carbon fibers are prevented from being in electrical contact with the metal part it should be OK. Longer term chafing might be worth considering.
  14. rnd2

    Attaching metal brackets to carbon fibre layup

    It will be a "battery" only if it gets wet. Even if you use ss, if does get wet, it won't help if salt is present and can accumulate. Isolate the two materials with a creep resisting electrical insulator such as epoxy grp, heavy film Mylar from Dupont. Electrical insulation specialist suppliers...
  15. rnd2

    PVC Pipe rated temperatures

    I would not use PVC pipe for carrying water where ambient temperature is more than 50 deg. C. What does the supplier recommend?
  16. rnd2

    EPDM rubber and NaOH

    According to my copy of Schweitzer's Corrosion Tables, Nordel (EPDM) is resistant to concentrations of NaOH between 10% and 70% through to "concentrated" while enduring temperatures up to 300 deg. F. As was swall's experience, it really depends what else is present in the liquor.
  17. rnd2

    Practical load calculation method

    skoggs Yes, pretty much. The idea to replicate in static mode the maximum force the device might need to operate. I thought it might be easier and safer to measure the force as well as deflection with the spindle stationary.
  18. rnd2

    Practical load calculation method

    I think skoggs is right in that it is just too difficult. Here is maybe a compromise. With the spindle running maximum, apply also the maximum operational load and somehow and record it. Turn the thing off and apply the same load but this time in static. Measure the deflection before and after...
  19. rnd2

    Nitronic 60 sleeve and bushing

    haze10 Why not consider attaching a zinc anode so that it is in electrical contact with the universal joint? That should alleviate galvanic corrosion which is probably occurring between the submerged part of the 304 auger and the 4140 universal joint, and at least let you select mechanically...
  20. rnd2

    SS to CS, type of electrode ???

    Try this thread: http://www.eng-tips.com/viewthread.cfm?qid=107465

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