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  1. rd400guy

    Quick connect/disconnect keychain

    I need help finding out who manufactures the quick connect assembly used on keychains like this one: I don't want to make keychains, I don't need the connection to have the holes drilled for keyrings. I am looking for this type of quick disconnect mechanical coupling device for use on a...
  2. rd400guy

    "Colder" air vs. larger intake area

    Since this is an engineering forum, I'll pose the question this way: Is there more benefit to having a colder charge air source, with a smaller inlet area, or engine compartment temperature air (with some outside air) and a larger inlet area? Here's the scenario, two modifications to a stock...
  3. rd400guy

    Carbon nanotubes

    Does anyone here have any knowledge of, or know where I can find any information regarding the decomposition of carbon nanotubes (CNT's)? A quick search found many papers regarding CNT production, and some properties of CNT's, but I'm interested in how, if, and when they fall apart. I know...
  4. rd400guy

    Torque Sticks: Why only pneumatic?

    I understand what a torque stick is: limits the amount of torque applied to a fastener (an "impact-torque wrench"). I understand how they work: http://www.procutinternational.com/html/torqstik/how_torqstiks.html (good explanation) Why can torque sticks only be used on pneumatic tools and not...
  5. rd400guy

    Another engine oil question

    Yesterday I had the oil changed in my 2000 VW Passat, 2.8L V6. (I don't own a garage yet and don't want to change my oil on the street in front of my apartment). The tech "mistakenly" put conventional Wolf's Head 15W-40 oil in instead of synthetic (they carry Pentosyn 5W-40) which I asked for...
  6. rd400guy

    Effect of weather on mileage?

    Am I going nuts here? This is something I've noticed recently: A few months ago (July, August) I was getting 29-30 mpg on my commute to and from work, which unfortunately is 104 mile round trip. They were dry, sunny days with temps around 85-90°F. The past few weeks, we've had a good deal of...
  7. rd400guy

    Shading coil material?

    What are shading coils on contactors typically made of? (please see my other post: thread237-137527)
  8. rd400guy

    Shading coil material?

    We have an OLD CH motor controller on a Tocco motor-generator for induction furnace. Nameplate shows: 500HP 60Hz 440V 520A 3ph. From time to time, the shading coil on one of the contactors burns out. We have some spare coils on hand, and also have some "new" ones that were made in house a...
  9. rd400guy

    Camshaft coatings?

    I've heard speculation that performance engine builders are using wear-resistant (TiN, etc.) coatings on camshafts. Anyone have any info or insight on this?
  10. rd400guy

    Coefficient of Thermal Expansion in High Temp. Regime?

    Does anyone have or know where I can find CTE values in high temperature ranges? Particularly RT to 2200°F for 300 series stainless, 400 series stainless, tool steels, and high-speed (M series) steels. Matweb and other online sources only seem to go to 500°C (~930°F) for the steels I'm...
  11. rd400guy

    Cored wire ladle treatment

    I'm looking for the impact of different cored wire compositions on inclusion content/morphology during ladle treatment. We're currently using Cal-Sil, and I'm wondering about aluminum calcium wire, or possibly magnesium wire. Google search was fruitless, only cal-sil info.
  12. rd400guy

    Density of molten (stainless) steel?

    In the steel industry, we generally use 0.26 pounds per cubic inch as the density of molten steel. After designing a prototype mold and casting a few ingots using it, it has become apparent that 0.26 pci is not the correct density. Specifically, we're casting stainless steels (T-304L, T-303+...
  13. rd400guy

    Weld gas mixer / manifold system

    In the next few years, I'll be putting together my own weld shop, and was wondering about the possibility of building a gas manifold so I could selectively run argon, helium, CO2, oxygen, or nitrogen, or any mixture thereof. I'd probably use mass flow meters to control ratios. I imagine it the...
  14. rd400guy

    Welder certification

    Can anyone give me a list of possible certifications for welders? I've been looking around all over the net, and found basic certifications (AWS), but everthing I seem to find essentially covers SMAW. In addition to being a metallurgist, I'm currently enrolled in the last stage of welding...
  15. rd400guy

    Columbium (Niobium) in Nuclear Quality Stainless

    We make a nuclear quality stainless (T-316L) that requires very low columbium levels (niobium to those outside the U.S. steel industry). What detrimental effect would high (above 0.01%) columbium have in a nuclear power plant enviornment? TIA.
  16. rd400guy

    AutoSketch vs. AutoCAD LT

    I'm trying to convince my boss to buy me AutoCAD LT. I've used it before (as well as many full versions of AutoCAD). He doesn't want to pony up the licensing fee, and wants to buy me AutoSketch. I've looked at reviews of AutoSketch, and I've seen compelling arguments for and against it...
  17. rd400guy

    Welding aluminum honeycomb sandwich panels?

    If I have an aluminum skinned, aluminum honeycomb sandwich panel, can I weld a part to the skin? I'm not interested in a full length bead, just a few tack beads to locate a support beam. I'm concerned that the heat of welding (probably GTAW or GMAW) might be deleterious to the adhesive used to...
  18. rd400guy

    Graphite mold release agent, suppliers?

    I'm having some concerns with non-metallic incusions entrapped during teeming of stainless steels. I'm considering replacing our standard powdered mold flux with a spray applied mold release, and purging with argon to prevent reoxidation during teeming. I've looked into boron nitride coatings...
  19. rd400guy

    Brush pigs - suppliers?

    I work in a steel mill, and we're noticing buildup of mold powder and scale on the interior of 18.75" circular molds. The molds are 110" tall. Since I can't find a wire wheel brush that diameter, I started looking at pipeline cleaning pigs as an alternative. Can anyone direct me to...
  20. rd400guy

    Need supplier info for SMAW electrodes

    I work in a steel mill, and we received a shipment of scrap listed as "Monel plus flux". Upon inspection, it was obvious they were SMAW electrodes, of various diameters and suppliers. Our concern is that the flux covering may adversely affect our slag chemistry in our electic arc...

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