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  1. karthur

    Controlling the size of S7 parts during heat treating

    Here is a view of the part. I want to finish the Ø2.438 hole and have it on size when it comes back from heat treating. This is S7 material that will be 48-52 Rc. I will have to find out exactly how the heat treater does the temper. Thanks...
  2. karthur

    Controlling the size of S7 parts during heat treating

    When I have my parts heat treated, they always come back either undersized or oversized. Is there something that will tell me how much the dimensions will change. If I had something that would tell how much per inch of length that would be great. I am mostly concerned with S7 material. Would...
  3. karthur

    What caused this to fail

    Interesting site. Thanks
  4. karthur

    What caused this to fail

    This is not a bolt. It was never under any preload. The threaded portion on the end was to secure tooling to the end of this (a punch). This part is made from tool steel, heat treated and then drawn down to 50 to 55 Rc.
  5. karthur

    What caused this to fail

    I need it to withstand 130ksi. With the heat treatment, S(y)= 200ksi to 230ksi. Without the heat treatment,it would would be less than 100ksi.
  6. karthur

    What caused this to fail

    I got the broken part back from our customer today. This part was on a new 125ton press that has only been in service for a couple weeks. The part was supposed to be heat treated to 50Rc. Somehow this part got past our QC dept without being heat treated. Since it was not heat treated, it...
  7. karthur

    What caused this to fail

    Yes. The shaft is threaded Ø1 9/16-12UN. This shaft is the working end of a punch ram where the tooling is connected. Under "normal" conditions, the shaft would only see axial compression loading.
  8. karthur

    What caused this to fail

    Here is a larger pic. Hopefully it will come thru. Thanks
  9. karthur

    What caused this to fail

    Would anyone want to list their best guess as to why this shaft failed? Shear, tension or compression? Was it a cyclic load or an abrupt failure? What can you tell from just this picture? Thanks
  10. karthur

    Blodgetts "Design of Welded Structures" question

    On page 8.1-2, Beam #5, there is a 5Da and 5Db shown in the chart. I can find 5B, 5C, and 5E on page 8.1-18. Can anyone tell me where to find 5Da or 5Db?
  11. karthur

    Deflection due to water

    "It is critical to know how the tank is supported. If the tank is supported on the short ends, or hung from the holes in the sides, there will be significant changes to the analysis." The tank rests on the floor. The holes are access and drain holes.
  12. karthur

    Deflection due to water

    aggman, I got the books in over the holidays. I started by working throught my problem using problem 1, page 6.5-1 as a guide. The first thing that I ran into was that my a/b=40/444=.09. This is off the chart in Table 1,4D. From this chart, if the length is more than twice the height...
  13. karthur

    Blodgetts "Design of Welded Structures" question

    JAE, "In these examples, the stiffener determination is not shown. What you have to do is determine the reaction at the top of the plate (the little arrow reaction symbol shown in condition 4C, Table 1). This would be a uniform load of X lbs/ft. This then would be a simple beam design...
  14. karthur

    Blodgetts "Design of Welded Structures" question

    JAE, "So I think that his formula on page 8.1-8 is incorrect and should be .0652 - not .00652." I thought that it should have been .00652 because he has the same equation for ?(max) on page 6.4-2, figure 3, condition B and on page 8.1-8. Also, in the formula for condition 3Da on page 8.1-7...
  15. karthur

    Blodgetts "Design of Welded Structures" question

    Thanks Drej, That is what I thought too. Going to the next example, "Considering Plate Section as a Beam", Blodgett calculates the maximum deflection on page 6.5-5 except for the (12) in the numerator and the (.5)^3 in the denominator of the calculation. Are these two values part of the...
  16. karthur

    Blodgetts "Design of Welded Structures" question

    I have just got a copy of this book and have a question that I hope someone can help me with. I am trying to design a water tank. I think that I need a stiffener around the top. On page 6.5-2 of this book, Blodgett shows an example "Tank with top edge stiffener". Nowhere in the formulas is...
  17. karthur

    Deflection due to water

    aggman, Thanks for the suggestion. I read his column in Welding Design and Fabrication every month. I just ordered both the Design of Welded Structures and Design of Weldments. Got both of them new for about $45. Can't wait to get them now. Thanks
  18. karthur

    Deflection due to water

    >Another simplification that may help- treat the sides as >vertical slats, design them as simply supported beams then >design the top stiffener to carry the reactions from the >top. The flat-plate equations approach this approximation >as the width becomes much larger than the height. How do I...
  19. karthur

    Deflection due to water

    ...will this "Rim Beam" reduce the stress and deflection in the side plates? From what I calculated, the force on the side walls are given by F=wL*d^2 where w=62.4lb/ft^3, L=440in(36.7ft), d=depth of water 40in(3.3ft). I get this to be 12,697lb I am still looking for a rectangular simply...
  20. karthur

    Deflection due to water

    I have an open top,rectangular water container. It is constructed with a bottom and four sides. The containter is 40" deep x 110" wide x 440" long. The walls are 1/4" thick. I need to know how to figure what the deflection will be on the sides of the tank. Thanks

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