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  1. DonLeffingwellPE

    True Length of Spline Curve

    Is there a command in Autocad that lets you measure the "true" length of a spline curve? Don Leffingwell dleffingwell@snet.net
  2. DonLeffingwellPE

    ME PE Exam

    Here is a URL for this site with more information. http://www.eng-tips.com/faqs.cfm?spid=731&sfid=3&CFID=16647063&CFTOKEN=71076716 Good Luck Don Leffingwell
  3. DonLeffingwellPE

    PE Question - take the FE exam or petition???

    I would suggest you look at the FAQ at the top of this forum in particular. Don Leffingwell
  4. DonLeffingwellPE

    Service Problem

    Thank you to all who responded. We did get a licensed electrician to look at the panel. The problem was a corroded main breaker, which of course we couldn't see without taking the panel apart. Don
  5. DonLeffingwellPE

    I was at my brother-in-laws for din

    Thank you to all who responded. We did get a licensed electrician to look at the panel. The problem was a corroded main breaker, which of course we couldn't see without taking the panel apart. Don
  6. DonLeffingwellPE

    Service Problem

    I was at my brother-in-laws for dinner Sunday night and he told me of a problem he had been having with his lights. He said they keep flickering, sometimes fast, sometimes slow. It doesn't happen all the time, and it seems to be random. And it only happens in part of the house. While I was...
  7. DonLeffingwellPE

    I was at my brother-in-laws for din

    I was at my brother-in-laws for dinner Sunday night and he told me of a problem he had been having with his lights. He said they keep flickering, sometimes fast, sometimes slow. It doesn't happen all the time, and it seems to be random. And it only happens in part of the house. While I was...
  8. DonLeffingwellPE

    Joint Industrial Council

    Thanks Reddog. I have purchased the NFPA 79 Electrical Standard for Industrial Machinery based on posting this same question in the electrical controls forum and the response I got there. Thanks anyway. Don
  9. DonLeffingwellPE

    machine frame design

    Below is the Lincoln Electric Site. I would also recommend this book. Don Leffingwell dlefffingwell@snet.net http://navigation.helper.realnames.com/framer/1/0/default.asp?realname=Lincoln+Electric+Company&url=http%3A%2F%2Fwww%2Elincolnelectric%2Ecom&frameid=1&providerid=0&uid=30021287
  10. DonLeffingwellPE

    Heat tranfer coefficients of steel???

    The above posters are exactly right. However, if you know the fluid involved, and the geometry, there are some published charts for ranges of heat transfer coefficients. Some books that have these charts: Mark's Handbook, Handbook of Heat Transfer, etc. These type of charts are useful for...
  11. DonLeffingwellPE

    Boiler Bottom Blow Down

    I'm sure you can find the answer at the site below, if not at this particular URL. Don Leffingwell dleffingwell@snet.net http://www.asme.org/bboard/main-frame.tcl?topic=Pressure%20Vessel%20and%20Piping
  12. DonLeffingwellPE

    steam trap replacement

    I don't know about the ultra sound but you can use an infrared temperature sensor to measure the temperature up stream and downstream of the trap. If the temperature is the same, the trap needs repair or replacing. Don Leffingwell PE
  13. DonLeffingwellPE

    Wood/Plastic Composite

    Thank you Steve. I will contact these people after the Holidays. This project most likely has been dropped. I have read about the wood flour and polymer twin screw extrusion technique at the Forest Products Lab site back in April. I sent them a letter and didn't receive a response. I am still...
  14. DonLeffingwellPE

    Obtaining PE License

    Look at the FAQ under Mechanical Engineer's. On source of possible references is consulatants you may have worked with. Don Leffingwell PE
  15. DonLeffingwellPE

    formula for tube bending

    I would take a length of tubing long enough to make the part, start bending at one end, and then finish by cutting off the excess at the other end. Tehn I would measure what I cut off. Since I know what I started with, I would have an exact answer. Otherwise: S = r*theta s = Arc Length r = bend...
  16. DonLeffingwellPE

    schematic or ladder diagram numbering methods

    Send me your e-mail address and I'll mail you one. Put JIC Drawing in the subject. Don Leffingwell dleffingwell@snet.net
  17. DonLeffingwellPE

    What is the definition of a "Pinion Gear"

    Main Entry: 3pinion Function: noun Etymology: French pignon, from Middle French peignon, from peigne comb, from Latin pecten -- more at PECTINATE Date: 1659 1 : a gear with a small number of...
  18. DonLeffingwellPE

    Templates

    MikeMilburn, There is something wrong with your URL link. Don Leffingwell dleffingwell@snet.net
  19. DonLeffingwellPE

    Welded Pipe Patches

    Nelson, The link below is for the Pressure Vessel and Piping Design Forum at the ASME site. These are the people who have standards for this kind of repair. I suggest that to place your question there. Don dleffingwell@snet.net...
  20. DonLeffingwellPE

    Pressure Build up in sealed vessel

    Power =Current x Voltage Power = Current^2 x Resistance for DC circuits You need to tell us the voltage and if its AC or DC In the same system of units, Power =Heat Heating of water, q (heat) = m x cp x (T1-T2) m = mass of water cp = specific heat for water T1 and T2 are starting and stopping...

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