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  • Users: tbuelna
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  1. tbuelna

    Poor durability of black oxide on 17-4PH stainless

    I have some parts made from 17-4PH cond H1025 stainless steel that require a black surface finish for cosmetic purposes only. I have been using MIL-DTL-13924 class 4 black oxide, but this black oxide coating is very easy to damage. I appreciate that black oxide coating is not intended to provide...
  2. tbuelna

    Cost of DLMS part in titanium

    I just got quotes for having a part made in 6Al-4V titanium using DLMS. I was a bit shocked when I saw the two vendor's quotes, both of which were right around $4K for a single part. The part volume is around 6 cu.in. (~1lb), the part dimensions are around 3.5"x2"x2.5", the shape of the part is...
  3. tbuelna

    Black Oxide Coating of Nitronic 60

    I am considering using moderately strain hardened (160ksi uts) Nitronic 60 bar for a shaft design. The shaft body will be loaded in shear and may experience a very small amount of sliding at the contact with the mating bore surface. The mating part is 17-4PH H1150 cres. I need a cosmetic black...
  4. tbuelna

    Saving a .cgr file as a .igs file

    I have a .cgr file I would like to save as a .igs file. How is this done? I tried inserting the .cgr file into a .CATProduct, but when I save the .CATProduct as a .igs file, the .igs file is empty. Can anyone help? TIA
  5. tbuelna

    2005 DEER Conference papers

    http://www.eere.energy.gov/vehiclesandfuels/resources/proceedings/2005_deer_presentations.shtml#session1
  6. tbuelna

    Dyno Service in My Area

    I have a piston engine I designed and built from scratch. I would like to run it on a dyno and get some baseline performance data (torque, HP, BSFC, maybe some emissions data?) and do a few hours of durability testing. The engine will (hopefully) make about 200HP max and run between 1000 and...
  7. tbuelna

    Production cost of auto engines?

    Does anyone have a valid figures for production costs of automotive engines? I've seen figures for a typical DOHC in-line 4 cylinder of about $700 to $800 (US$). I'm curious if this number is correct- it seems a little bit low. And how much more would a V6 or V8 engine be? Thanks in advance. Terry
  8. tbuelna

    Varying main rotor speed

    Please forgive my ignorance on the subject of helicopter aerodynamics, but I have a question: Is there any value in being able to vary the main rotor speed in relation to the engine speed? I have a design for a CVT that can handle high levels of torque. The CVT is (fairly) light weight, has a...

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