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  • Users: btrueblood
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  1. btrueblood

    BOOM lives up to its name

    Boom Supersonic takes its XB1 demonstrator above Mach 1.
  2. btrueblood

    Older drivers drive older (less safe) cars, and die more often as a result - IIHS study

    https://www.iihs.org/news/detail/retirement-vehicles-raise-the-risk-of-crash-fatalities-for-older-drivers
  3. btrueblood

    Acetoxy- curing silicone used on circuit boards.

    So, sometime before the holidays our company received a batch of new circuit boards, to the tune of several hundred dollar per board. These have several large electrolytic caps on them, which the board shop glued to the board using silicone rtv. Not until a couple of days ago did I realize...
  4. btrueblood

    What do you do?

    Face palm? Head shake? We moved our production and test facility down the road a bit several months ago. The large test stand took the longest to get back up to speed, partly because it has low demand right now, and partly because we were modifying the tank (welding on another vertical...
  5. btrueblood

    Ideas for trade show demo unit shipping case

    I've been tasked with the lucky job of designing the next trade show "demo. unit" for our sister company. The demonstration unit itself is mostly designed already, and will break down into two roughly 30 inch cubes. Easy enough. But the boss wants the units to be easily moved, and easily...
  6. btrueblood

    How not to dry wet sand...

    Electric charcoal lighter plunged into a metal bucket containing wet sand...a colleague learned why you don't walk away from something like this. Luckily nobody was hurt (well maybe one person's ego), nothing burned down. A tech I work with heard the wiring rattling in the conduit just before...
  7. btrueblood

    Maple burl

    Probably a lousy time to mention this, as I leave tonight for a 1.5 week vacation ... My brother is actively managing my Dad's farm, as he is in the last stages of Alzheimer's, and Mom is suffering from senility/dementia as well. To keep some income coming in for them, he rents the pasture for...
  8. btrueblood

    Any experience with inert gas purge or evacuated molds for rubber

    Has anyone had any experience with the subject matter, and could you point me towards a reference that talks about this matter? We are having trouble with air inhibition of cure in molding and bonding (to primered bronze substrate) of a peroxide-cured EPDM. I have seen one referenced paper...
  9. btrueblood

    Best nylon for fabrics under hot/wet environments

    Doing some research, again, to find a fabric that can withstand 220-230 deg. F, wet (pressurized hot water) environment. The pH condition of the water can be assumed neutral (rare) to fairly strongly alkaline (to pH of 10, but could be limited to less than that if it improves the longevity of...
  10. btrueblood

    Tech Pubs report, submitted for peer review

    Some time ago, our colleague Skogsgurra posted a report on the results of some external ballistics research, involving cans of pressurized fluid and fast-moving lead projectiles. In the spirit of his efforts to advance scientific knowledge, and to help him stave off recent grumpiness, I offer...
  11. btrueblood

    AutoCad and Inventor imports to Revit

    I have been asked to provide models of our company's devices in a Revit-compatible format (we make piping system components, FWIW). From the Autodesk website, it would appear that 3d solid model files (e.g. Inventor .ipt files, or .step "dumb solid" exports from Inventor) should import "just...
  12. btrueblood

    ASTM F1941 - zinc plating high-strength cap screws?

    Ok, it may have been done to death, but I had not heard of the ASTM F1941 and its cohort spec. F1940 before. A quick search failed to deliver a succinct answer. If zinc plating is applied per F1941, can an ASTM A574 alloy socket head cap screw be reasonably said to be free of hydrogen...
  13. btrueblood

    Polyethylene(?) fluorescent dye quenching

    I think I know the answer to this, but want to ask. Lots of fleece clothing on the market these days, it's cheap and warm. Makes good hunting clothing. But most of it also has optical brighteners or UV dyes (OBA's) added, and I assume it's added to the melt prior to being extruded to fibers...
  14. btrueblood

    For BigInch: "Syphons" in zero G

    For BigInch, I decided to start a new thread to discuss propellant tanks in zero G. More than he wanted to know, probably: Propellant management for spacecraft, or the art of keeping gas bubbles out of the engine intakes, is done by a variety of methods. See...
  15. btrueblood

    Nylon as a moisture barrier

    I have some extruded Nylon 6 tubing that became surplus from our shop. I'd like to use it for making some waterproof containers (that I could dye to an appropriate color for its use), sealing the ends with an O-ring plug. Somehow I got the idea that the hygroscopic (moisture absorbing)...
  16. btrueblood

    More puzzles...this time solved.

    I've seen a lot of science/nature type TV shows talk about the mysterious moving rocks (they leave trails in the dirt) on dry lake beds in California. This video gives a dang plausible explanation, the first and best I've heard: http://www.youtube.com/watch?v=u1hoiHvOeGc
  17. btrueblood

    EcoBrass castings - any experience?

    A foundry sent me an email stating they would like to change the metal they will be pouring for one of our parts from a leaded brass, C83600, to "EcoBrass", C87850. We aren't making potable water system parts, so the low lead content isn't a big seller for us, but the higher strength and...
  18. btrueblood

    Coil spring stress equation for tubular (vs. solid) wire?

    Looked through my Wahl's Mechanical Springs text on how to compute the shear stress in a coil spring when the "wire" is actually a coiled tube. I finally decided to take the "J" (torsional area moment) in the standard spring equation, and replace it with a (Do^4-Di^4) term. More specifically...
  19. btrueblood

    203 vs. 303 galling/wear

    Have an application for a stainless shaft operating in a brass plain bearing (C37700 forged brass, 38-40% zinc, 1-2% lead, Cu rem.). Looking at a screw-machined shaft piece of either 203 or 303 stainless, it looks like they are roughly equivalent for corrosion resistance, but I'm not sure if...
  20. btrueblood

    Magnetic flowmeter calibration

    Our company owns a 12" magnetic flowtube and transmitter from the Rosemount company, but it's pretty old. The meter is installed in a flow test system for cast iron valves, and may be subject to erosion from sand and rust particles. We (I) am now in the process of trying to update the...

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