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  1. engtiuser2

    Axis alignment detection

    The only down side is computer vision system can be expensive.
  2. engtiuser2

    Axis alignment detection

    Computer vision, yes, is there any particular system which can be used in my application.
  3. engtiuser2

    Axis alignment detection

    The shaft length is about 5 ft long and they will be fed into the work area continuously, hence, there is no possibility to mounting anything on the wood. i don't think digital vernier can measure moving object. I was thinking about remote sensing through optical measures (e.g. laser...
  4. engtiuser2

    Axis alignment detection

    I image the detector will be calibrated to setup the perfect plane (say X) as reference. The shaft came in will be checked against the plane for displacement and rotation as store the misalignment value. The detector should be able to measure linear displacement of +/-10mm and angular...
  5. engtiuser2

    Axis alignment detection

    I am looking for a fast and easy to detect the alignment (misalignment w.r.t horizontal plain) of the wood shaft (10mm diameter, 20cm long) which enters a work area. The shaft is to be fed along the its axis direction with feed rate of around 10 ft/s. The accuracy should be within 0.2 mm per ft.
  6. engtiuser2

    GTAW (TIG) weld is known to be able

    Thanks everyone. We still use GTAW for 1/8" and 1/4 sheet and the weld is just unmatched by MIG. It has good penetration and low distortion. In my opinion, it should still worth to be part of pre-qualified weld.
  7. engtiuser2

    GTAW (TIG) weld is known to be able

    GTAW (TIG) weld is known to be able to produce high quality weld. However, it is not part of the pre-qualified weld for steel. That means, each and every TIG weld needs to be qualified. Is there any known reason for this?
  8. engtiuser2

    Repair of damaged steel structure

    Thanks R13, the article also mentioned 5% strain, but again, there is no reference to any specification.
  9. engtiuser2

    Repair of damaged steel structure

    The bar or pipe is typically failed by overloading by cantilever action (one end fixed while other end support a load). It typically bent the shaft in curve shape. The steel is made out of of AISI1030. There is typically yielding but no cracks. The parts are zinc plated and we do not want to...
  10. engtiuser2

    Repair of damaged steel structure

    I am looking for a simple guideline to help the production to determine whether a damaged part can be straightened. There are publication mentioned 5 percent permanent strain should not tolerable for any damage but the rationale can never be found. If 5% limit is true, I can come up with...
  11. engtiuser2

    Repair of damaged steel structure

    I am looking for reference to help creating a guideline for assessing the damaged steel member and develop criteria for cold straightening. The steels (mild steel) are typical in the sheet and bar form and damages by bending. I am looking for a best practice/industrial standard/ rule of thumb...
  12. engtiuser2

    Calculation for beam orientation

    Hi Hturkak, Thanks for sharing the idea. I am still digesting your calculation. There are couple of thing that puzzling this rusty old man and would appreciate if you can shed some light. 2nd line: Assuming R1 is the upward force at first support created by P, should it be simply P/4? Not...
  13. engtiuser2

    Calculation for beam orientation

    Friction was mentioned to prevent the beam from sliding. Please refer to the attachment for the schematic. https://files.engineering.com/getfile.aspx?folder=702ad2be-7bad-4990-9ac1-b8b3e2d96de8&file=20200501_160435.jpg
  14. engtiuser2

    Calculation for beam orientation

    I am not sure if the beam will be rotated at the center of the support (along the centroid) although I tend to think that way.
  15. engtiuser2

    Calculation for beam orientation

    I am old enough to be somebody's grand father, unfortunately I got rusty in this kind of problem (may be statistical indeterminate).. love to go to school again but have no luxury. This is a problem that I see from work. The springs are compressed by the weight of the beam (I used the term of...
  16. engtiuser2

    Calculation for beam orientation

    I am trying to predict the position of the beam after it is pushed (vertically up) on one end to a known displacement. The beam was originally supported by 4 compression springs with identical spring constant. The springs are equally spaced under the beam (supported at 1/5, 2/5, 3/5, 4/5 of...
  17. engtiuser2

    Square Butt Weld

    Great, thanks for the clarification.
  18. engtiuser2

    Square Butt Weld

    Are you refering to D1.6? Section 7 is for stud weld. My copy of D1.6 is 2007 version.
  19. engtiuser2

    Square Butt Weld

    If I grind flat (remove reinforcement)the weld, would that still conform to code as the code doesn't mentioned the reinforcement can be removed.
  20. engtiuser2

    Square Butt Weld

    The service load is low, estimated 50 lb max applies perpendicular to the weld axis. The weld length is about 40mm (all around the end cap plate). It is sort of like an end cap welded on to a square tube where the butt joint formed between the inner surface of the tube to the edge of the cap...

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