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  1. Hammer335i

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

    This is the DC/DC converter I bought: https://a.co/d/cqE37cr
  2. Hammer335i

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

    Oh and one more question: since this is a 63 Ah battery and I am burning 4 x 10A LED, does that mean this thing will only run for an hour and a half?
  3. 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...
  4. Hammer335i

    AISC Safety Factor for Tested Connection

    Thanks, but I am looking for something a little more definitive than that.
  5. 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...
  6. 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...
  7. Hammer335i

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

    The parts are in the design process so I don't know if they would loosen up and I don't have any pictures. I am looking to see if I get a warning like "holy cow that is the dumbest thing I've ever heard of! don't do it!
  8. 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...
  9. Hammer335i

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

    Thanks for the response. I am just wondering about the flattened end, which will also be punched with a slot/hole for a bolted connection, designed to not be scary per AISC. This is a part for a solar application that will have minimal risk to life. Attached is a drawing of the part...
  10. 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...
  11. Hammer335i

    Corrosion of Galvanized Steel in Soil

    Rconner: I had previously found that circular but it was the wrong one, it deals with magnetism. I did some research on google scholar and found it located here: http://babel.hathitrust.org/cgi/pt?id=mdp.39015077295122 This thread can be closed and archived since I have answered my own...
  12. 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...
  13. Hammer335i

    Steel Beam - Bending Safety Factor

    BA - yes, I am trying to reduce the member. JS - higher strength steel is a option. Just to give an idea, each structure is about 30' long by 15' wide, monosloped open to the air. The beam in question is a 4" round tube that I would like to reduce the wall thickness of in order to reduce the...
  14. Hammer335i

    Steel Beam - Bending Safety Factor

    Thanks for all your input! I suppose I will not move forward with that design modification. I actually work for a company that does little structures like this all the time and they are also pressuring to lighten the system as well (in this case the client is pushing harder than my company)...
  15. Hammer335i

    Steel Beam - Bending Safety Factor

    I am using ASCE 7-10 for wind and snow loading, etc and it is true that that there are reductions in the loads due to risk/importance. There are no building codes governing this installation and the client is looking to reduce the steel and this is one way I can see a possibility. It is the...
  16. 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...
  17. Hammer335i

    Faying Surfaces

    Thanks for the best response with actual help! Just so you know - I did use google, but I found a lot technical data, not relevant to the actual preparation of the surfaces.
  18. Hammer335i

    Faying Surfaces

    Just to clarify, I am looking for help on how to prepare the faying surfaces. Do they need to be roughed up? if so with what kind of tool? Are there any techniques that you've used to prepare them, or are they simply just not painted/coated and/or have any coatings removed? Also, for all...
  19. Hammer335i

    Faying Surfaces

    Any help would be greatly appreciated!
  20. Hammer335i

    Faying Surfaces

    In reading the AISC manual, I am given to understand that slip critical bolted joints have faying (fayed) surfaces and that special care must be taken to keep the surfaces rough, with mu=0.5 or so. I have read that galvanization tends to creep from these tensioned connections. Maybe I am...

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