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  1. DrMetal

    Masters in Metallurgy

    Va. Tech too. Guess where I went. Maybe also, Colorado School of Mines, OH State, RPI, Purdue, Case Western, etc.
  2. DrMetal

    CWI Benefits

    This forum caught my attention in regards to gtaw's comments on the "buzz box welding engineer" ... does anyone know if it correct to tell a company or an individual these days that it is unlawful to use the word "Engineer" in your title or company name unless you have an Engineering degree from...
  3. DrMetal

    D1.5 WPS/PQR

    MalinQC, - Good luck on this. There is WAAAAY too much info in AWS D1.5 to address in this forum. Even very specific questions can get extremely involved in this spec. See my earlier thread on the PQR questions. The best advise I can give you is to study the Code in great detail to learn...
  4. DrMetal

    AWS D1.5 Bridge Code: PQR question

    Gents, - Sorry for the delay ... been up to my beltline on this CALTRANS project. BTW ... still no official reply from AWS on this issue ... this project may be complete before we hear from them. I uploaded the excel spreadsheet for the WPS attachment. It is fairly self explanatory, but let...
  5. DrMetal

    AWS D1.5 Bridge Code: PQR question

    - Still waiting for AWS to reply. They have acknowledged the inquiry, but no official response as of Aug-31-2009. From a practical standpoint, we resolved the "restrictive" weld parameter situation by adding an excel chart to the WPS showing Volts vs. Amps and calculating the min and max...
  6. DrMetal

    Find circle radius & circle center in 3D from (3) XYZ pts

    Doug, - Thanks again for postings. Most helpful. - By any chance do you have a couple of related formulas? 1) After determining the circle radius and center point, do you have an Excel solution to determine the coordinates of any other point on the circle given any one of the X-Y-Z...
  7. DrMetal

    Find circle radius & circle center in 3D from (3) XYZ pts

    RB, - I agree .. I think we have beat this one to death. But to answer your question ... we have to define it before we can make it ... and making this shape is not a big problem ... we have bent the 1st two short pipes and can make them lay on a true cut template within 1/16". Accuracy is...
  8. DrMetal

    Find circle radius & circle center in 3D from (3) XYZ pts

    Doug, - On the error issue ... this is actually what we are dealing with. We are given the 3 pts by an outside Engr party. When checking first for both tangent lines being equal, they are not equal (in all 4 cases for us). What we did was to move the point of intersection (POI) in the...
  9. DrMetal

    Find circle radius & circle center in 3D from (3) XYZ pts

    Hi Doug, - Quick question ... I must be doing something wrong ... when I plug in new numbers into the points for XYZ in your spreadsheet, the results all return the "#NAME" error, as if it can't read my inputs. Do I need to format the numbers that I enter a certain way? Or something else...
  10. DrMetal

    Find circle radius & circle center in 3D from (3) XYZ pts

    Hi Doug, - See what I got you into! Heck-of-a thread on this subject. I had no idea that it would be this "intriguing" to all the posters. Thanks for all of your input on this, and your emails too, and everyone else for the postings. We are getting ready to do the original PIPE developments...
  11. DrMetal

    Find circle radius & circle center in 3D from (3) XYZ pts

    RB, - I thought that since we can solve for R and V, that the numbers could be used in the simultaneous equations to find the center point coordinates, but maybe not. Again, maybe my rusty math at work. I still haven't been able to put the solution together yet. Some related to time to work...
  12. DrMetal

    Find circle radius & circle center in 3D from (3) XYZ pts

    Williedawg, - I have not finished going thru all this to solve for the circle center. But I believe the answer is here. I have an Excel SS set up to solve for Xc,Yc in 2D ... using 3 simulataneous equations, it works fine to solve for the 2 points (Xc,Yc) ... so I assumed I need 4 equations...
  13. DrMetal

    Find circle radius & circle center in 3D from (3) XYZ pts

    Chicopee ... thanks for the attachment too. I think this works, but I think there was an error in Eq 4, to find "R". Shouldn't that formula be: T/R = TAN(I/2) ... therefore, R = T / TAN(I/2)? I plugged these formulas into Excel. When I ran it this way, it seems to come out correct. But...
  14. DrMetal

    Blunt start thread/Higbee cut

    - We have our machine vendors do this type of thread end cuts routinely on large ACME threaded parts to remove the knife edge. - No diagram, but we describe it as ... "Mill or cut back thread ends to the FIRST FULL CROSS SECTION of thread (i.e. Higbee Cut). The removed portion of the thread...
  15. DrMetal

    Find circle radius & circle center in 3D from (3) XYZ pts

    Gents, - Sorry for the delay to say thanks to all for the great responses to this thread. I have not completed this yet, but am very confident that we have sufficient information to complete the solution I was after. So thanks again to all. Very nicely done! MWP
  16. DrMetal

    Find circle radius & circle center in 3D from (3) XYZ pts

    Gents .. lots of responses here ... all good info. Just to clarify on some of the issues / questions. 1) I know we need 4 points to define a sphere. But we are not looking for anything spherical. We are only looking for a radius and the ceenter of that radius, as determined by the three...
  17. DrMetal

    Find circle radius & circle center in 3D from (3) XYZ pts

    GIVEN: X-Y-Z coordinates of 3 points in 3D space. FIND: Radius of circle on those 3 points & Circle center co-ordinatesBookmark: Question: Can someone provide a mathematical step by step procedure to calculate and determine a circle radius and the center point coordinates from three GIVEN 3D...
  18. DrMetal

    AWS D1.5 Bridge Code: PQR question

    Hg ... No, I agree with you. Within a single weld pass, we would not except hardly any variation in the PQR or in production. And within a production WPS weld joint, we would also expect the welder to choose his power settings within the WPS allowances, that allow the process to run the best...
  19. DrMetal

    AWS D1.5 Bridge Code: PQR question

    Thanks Again Hg ... I agree with all you've said here. Since my last posting, our customer's Engineer has contacted several other people, includng someone at AWS on this issue. Verbally, the AWS guy restated the average heat input theory ... but also stated that there are NO limits in AWS...
  20. DrMetal

    ALUM WELD BEVEL, 60 OR 45 DEGREES

    TM ... I don't want to sound ignorant here, but can you "flip" the plate over to saw cut a reverse 30 degree bevel, and then have a 60 degrees when you flip it back? I had that "simple" problem too on a band saw until a "through the eyes of a baby" employee suggested it. Just a suggestion, but...

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