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  • Users: Hammer335i
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  1. Hammer335i

    36V step down to 12V/20A for two pairs of LED’s

    I am not an electrical engineer but I took a few circuit classes in college 20 years ago 😂. Before I burn up some very expensive LED’s can someone please check my work? Here is the situation: I have a 36V/63Ah LifFePo deep cycle marine battery that I need to connect to four 12V/10A LED’s on my...
  2. Hammer335i

    AISC Safety Factor for Tested Connection

    Friends, My company developed a clamp that fits around a vertical pipe to allow a connection to wind brace member (acts in tension and compression) that comes in at an angle. This clamp uses a single thru-bolt to close the clamp and secure the wind brace to the clamp/vertical pipe. We had this...
  3. Hammer335i

    ASCE 7-05/10 Monoslope Free Roof Question

    Friends, I work for a firm that designs canopies and solar structures and we exclusively use ASCE 7 to design them as monoslope free roofs (Fig 6-18A in 7-05 and 27-4-4 in 7-10) . This works great for tilt angles ranging from 0 to 45 degrees, but I have a client that wants us to design a solar...
  4. Hammer335i

    Serrated Flange Hex Nut with a Slot - A good idea?

    Friends, I am looking at designing a grade 5 3/8" bolt assembly that needs a 1"x7/16" slot for horizontal adjustability (force will be in tension, perpendicular to the slot). I prefer the bolt to be secured with a standard serrated flange hex nut, but I am wondering if the limited amount of...
  5. Hammer335i

    Flattened Tube - Resulting Strength - Finite Element Analysis (FEA)

    I am looking at flattening the end of a tube for an easier mechanical connection, but I want to make sure the resulting shape is strong enough to handle the applied design loads. I can make the part in Autodesk Inventor and run it through the program's FEA application, but with my limited...
  6. Hammer335i

    Corrosion of Galvanized Steel in Soil

    I found this thread: http://www.eng-tips.com/viewthread.cfm?qid=191227#post and I am looking for this reference: M. Romanoff, Underground Corrosion, National Bureau of Standards Circular 579, 1957 Any ideas on where I can find it? I am looking to obtain corrosion rates of galvanized steel...
  7. Hammer335i

    Steel Beam - Bending Safety Factor

    I am designing an agricultural greenhouse type structure that will never be inhabited or be used for shelter by anyone (fenced off and presents minimal risk of danger to anyone). AISC defines the safety factor against yield in beams in bending as 1.67. Since this structure has an estimated life...
  8. Hammer335i

    Faying Surfaces

    I am engineering a galvanized or powder coated steel car port parking canopy product that uses a pinned frame system to support a lightweight deck. I would like each connection to be a single 1/2" thru-bolt, but my colleague is arguing that due to the lack of redundancy, he would prefer either...

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