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  1. eromlignod

    Sliding VS Rolling linear slides for machinery

    Hard ways are cheaper and handle a larger load. Ball bearings have much less friction. Don Kansas City
  2. eromlignod

    Best way to bus many cirucuit boards?

    Hi: I have an application where I have many (50+) individual, very small circuit boards, each with its own independent microcontroller. Each circuit takes more power than would be practical for batteries, so I have to run a power bus to all of them (+24, +5 and ground). I also have synchronous...
  3. eromlignod

    Oxidation as in situ insulation?

    The objects are actually in contact with each other with about 75 lbs force. There is no gap for a coating. That's why I'd like to chemically change the outermost surface of one or both to another compound that insulates. The contact spot is small, so I'm hoping some sort of oxidation could...
  4. eromlignod

    Oxidation as in situ insulation?

    Hi guys: I am a mechanical engineer with an application where I have steel and brass contacting each other at a point (think of two spheres contacting each other). I need to electrically insulate them from one another, but it is impossible to add a physical insulator between them in this...
  5. eromlignod

    Angular Value in Europe

    Most new calculators don't even have grads on them anymore. It's some sort of metric that never caught on. Don Kansas City
  6. eromlignod

    Thermal expansion on weld coated bar

    Yeah, I guess you're right, Fox. The diameter would undergo linear expansion in all directions just like the length. All these years I've been doing it the hard way! Don
  7. eromlignod

    Thermal expansion on weld coated bar

    First of all, if you're concerned about the diameter, make sure you're using the VOLUMETRIC coefficient and formula, not the linear one. Calculate the expansion of the inner cylinder first. Then calculate what the thickness change would be for the outer "hoop" by calculating the change in...
  8. eromlignod

    How do I know what thread pitch I can use?

    You can use any pitch you want. It depends on your application. For a non-standard, unified thread you can calculate the appropriate dimensions using the chart in the Machinery's Handbook. To designate the thread on a drawing you give the major diameter followed by the tpi, the class, and...
  9. eromlignod

    Design for multi-country manufacture - Metric vs. inch stock

    Steve wrote: "Oops, I sound like I'm goading. I'm not. I'm just interested. As I mentioned before, the idea that Volts*Amperes gives the same (W) as N*m/s thrilled me as a kid." I wasn't trying to say that the Metric System isn't superior in some ways. I'm only saying that it's overrated...
  10. eromlignod

    Design for multi-country manufacture - Metric vs. inch stock

    The imperial system is based on feet, slugs and seconds. Force is a derived unit, just like in metric, and is in pounds. Using pounds-mass is as stupid as using kilogram-force (which you do see sometimes). As long as you use slugs for mass you can use all the same, simple mechanics formulas...
  11. eromlignod

    Grit finish

    You need a profilometer. Don Kansas City
  12. eromlignod

    Design for multi-country manufacture - Metric vs. inch stock

    "I never heard of a slug in thermodynamics, it was all in lbm or kg. I've seen that in a few old books, but never used in school. I think it went out of style along with dynes, poises, etc. Unlike kg-f, bars, calories, and other non-SI units which I still see." "lbm" are strictly...
  13. eromlignod

    Design for multi-country manufacture - Metric vs. inch stock

    I started learning the metric system in fifth grade (1974). It has been shoved down my throat my entire life. I know it forwards and backwards and so do all the engineers I have ever worked with (I have been in industry for 22 years). I can think in metric all I want. When I estimate the...
  14. eromlignod

    5&3/16" -16UN thread

    Interpolate. Don Kansas City
  15. eromlignod

    Design for multi-country manufacture - Metric vs. inch stock

    Contrary to what most of the world seems to believe, the United States is not "non-metric". We are both metric and imperial equally. Any American engineer under the age of about 60 is utterly bilingual with regard to measurement systems. You can get virtually any metric part you want here...
  16. eromlignod

    How to ensure smooth engagement of moving pinion with fixed rack?

    Can you link it with another pinion that is already on the rack (like with a timing belt) and synchronize it? Don Kansas City
  17. eromlignod

    #12 screws

    You see them specified from time to time. I personally always jump from 10-24 to 1/4-20. I also jump from 3/8 to 1/2, skipping 7/16, but that's just me. In the old-timey times there used to be a #14 machine screw as well, but I haven't seen one of those for a long time. Don Kansas City
  18. eromlignod

    Material and Heat Treat condition of a Flexible Blade

    1095 was probably a pretty good choice. Did you temper after hardening? Don Kansas City
  19. eromlignod

    D shaped bore in timing pulley

    Sounds like you need to administer regular beatings to your assemblers. Don Kansas City
  20. eromlignod

    Troubleshooting Air Valve Failures

    Direct solenoid or poppet/pilot spool? Don Kansas City

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