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  • #46
    Originally posted by USFASME View Post
    Hi All,

    We are a student organization, the American Society of Mechanical Engineers, at the University of South Florida. We will be receiving a Miller 140 MIG this week. Our first projects will be to construct two work tables, one a large conference like welding/general use table, and the other a cutting and tool station.

    The plans can be found attached. The conference table PDF is too large, so one is PDF, and both are in the .zip file.

    Our general questions are, what is everyones overall thoughts on the designs? Also, the top is 3/8" thick, and the legs are 1/8" wall 2x2 square tubing. What are good settings for the welder to weld this differential thickness joint? Shield gas will be 75/25, and I think the wire is .035".

    According to our analysis, the projects can support significant loading, limitations are included in the drawings.

    This will be our first welding project, so any advice is greatly appreciated. We have not started this project yet, so there is still time to make design changes.

    Thank you,
    ASME @ USF
    Before I look at the table plans I want to say something about PDF files.
    PDF files (portable document files) were designed just for business people to send large files worldwide over the internet at high speed. That IS the purpose of a PDF file. But you must select WEB use quality.

    You will notice when you save the file there are 3 choices. Files for PRINT. High quality. And files for the INTERNET USE Lower quality
    (WEB quality) but still look just fine.

    Choose the WEB high speed file for internet use.
    If you use a ZIP file then not all computer users can view them. Remember some of us use MAC's

    The PDF was expressly designed so that ALL computer users can view the document no matter what computer or program they have.

    All computers sold come with Acrobat reader to view the Acrobat PDF files.
    You do not need to zip a file that is only 38.1KB. But if it was 38.1MB you would need to reduce the file size.

    Now about the tables.

    FIRST TABLE
    The first one 5 feet by 30 inches.

    You will not be able to weld the 3/8 plate OR the 1/2 inch plates for the feet with a Miller 140.
    If you weld anything to the table top the table top will be WARPED. BAD DESIGN.
    The .035 wire does not run well in the Miller 140 . The .024 wire runs better.
    The 1/8 thickness wall 2 inch tubing you can weld if the Miller 140 is turned all the way up.
    BUT you will not be able to weld the 1/8 thick 2 inch square tubing to the 1/2 inch thick foot plates.
    You will only be able to use the Miller 140 for welding the 2 inch tubing to 2 inch tubing if the Miller 140 is turned all the way up.

    Here is what I would do.

    Make the frame of the table independent of the table top. The table will stay flat if you do not weld it on.
    Do-able with the Miller 140 turned all the way up using .024 wire.

    Then weld on feet to the bottom legs but you do not need 1/2 thick material.
    Just use 1/8 plates because the purpose of the foot is to be in shear and keep the leg from moving on the concrete floor.

    Then attach the table top with counter sunk SCREWS drilled and tapped into the 1/8 thick 2 inch square tubing.
    The top of the table is 3/8 inch on your drawing. Think about how many people will be required to lift that table top.
    Last edited by Donald Branscom; 02-10-2011, 10:37 AM.

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    • #47
      Originally posted by Donald Branscom View Post
      Before I look at the table plans I want to say something about PDF files.
      PDF files (portable document files) were designed just for business people to send large files worldwide over the internet at high speed. That IS the purpose of a PDF file. But you must select WEB use quality.

      You will notice when you save the file there are 3 choices. Files for PRINT. High quality. And files for the INTERNET USE Lower quality
      (WEB quality) but still look just fine.

      Choose the WEB high speed file for internet use.
      If you use a ZIP file then not all computer users can view them. Remember some of us use MAC's

      The PDF was expressly designed so that ALL computer users can view the document no matter what computer or program they have.

      All computers sold come with Acrobat reader to view the Acrobat PDF files.
      Definitely helpful comments. Thanks.

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      • #48
        Photo of a welding table.
        Sorry double post.
        Last edited by Donald Branscom; 02-13-2011, 03:23 PM.

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        • #49
          Go BACK to Post #2.

          Look at the miller welding tables.

          Also I think a 5 foot table really does need 6 legs NOT 4 legs.



          The height of the table is really important since different height people will be using the table.
          Better get that worked out and discuss that amongst yourselves..
          Last edited by Donald Branscom; 02-10-2011, 06:03 PM. Reason: photo

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          • #50
            If any one is going to be working on a motorcycle building project the best height for a table is 22 inches because you can sit down while working, AND those hydraulic lift tables can go up to 22 inches. It makes it easy to lift the engine up to that height and scoot it over on to the table. Then you can lower the engine back down when the frame goes out for paint if needed.

            30 inches wide is perfect because that is as far as a person can reach.

            Length=depends on the motorcycle design.

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            • #51
              Set your welder for the thicker metal, annd then when you weld it, concentrate more of the weld on the thicker plate so as not to burn through the lighter guage stuff.
              A very common mistake made is to set the machine for the lighter of the 2 materials which leads to cold-lap or non fusion in the joint.
              Big Blue 400D
              Trailblazer 302
              Miller S-32 suitcase
              12VS suitcase
              Lincoln LN-7 (BIG suitcase)
              Victor torches
              Lincoln 350MP with 35' push-pull gun
              Lincoln PrecisionTIG 375
              Spectrum 1000 plasma cutter

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              • #52
                Originally posted by USFASME View Post
                Thanks. We saw that and looked it over. Does anyone have any thoughts on the cutting section and tray? I guess that's for plasma cutting? Is it necessary? We don't have one right now, but are hoping to get one in the next 12-18 months.

                ASME@USF
                Keep the cutting /burning table separate.

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