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  1. #1
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    Default Step by step on making a Square to Round transition

    As I am building my cyclone and duct work http://www.woodworkforums.ubeaut.com...ad.php?t=31169 some people have asked how I go about making bits and pieces, I thought I would post some pics of a step by step on how to make a square to round transition. Sorry its not on video,

    For this exercise I will be making a 150mm x 150mm (square) to 150mm Dia (round) x 150mm High as per the drawing in Pic
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    Al .

    You don't know, what you don't know, until you know it.

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  3. #2
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    I start out by marking a straight line vertically and horizontally 90deg to each other

    Then I mark out plan view of the transition, as its all equal (Not offset) I only need draw up a quarter plan view.
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    Al .

    You don't know, what you don't know, until you know it.

  4. #3
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    After drawing the quarter circle and without adjusting the dividers I divide the quarter circle into 3 equal parts.

    I then number each point and label the top right and left hand corners,

    I then mark the height the transition will be on the vertical line thatís on the left hand side. In this case its 150mm.
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    Al .

    You don't know, what you don't know, until you know it.

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    With the dividers I start from point A and get the distance from each of the points on the arc transferring the measurements on the horizontal line, Labeling each mark as I go.
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    Al .

    You don't know, what you don't know, until you know it.

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    Once I have transferred all the measurements onto the horizontal line I am ready to start developing the pattern.

    I begin by drawing a horizontal line and marking out the width of the square side of the transition (In this case its 150mm). At each end of the line I label it with the letter A

    Now with my dividers I get the measurement from transition height point to the point 1 And transfer this measurement over to the pattern. From point A on the right side of the line I draw an arc and the do the same on from point A on the left side of the line crossing the two arcs. This now is point 1 on the pattern.
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    Al .

    You don't know, what you don't know, until you know it.

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    Next with the dividers I get the measurement from the quarter circle, as its divided into 3 equal parts the measurement should be the same from point 1 to 2 - 2 to 3 and 3 to 4.

    Then over to the pattern I mark an arc either side of point 1
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    Al .

    You don't know, what you don't know, until you know it.

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    Next with my dividers I get the measurement from transition height point to the point 2 and transfer this measurement over to the pattern. From point A on the right side of the line I draw an arc and the do the same on From point A on the left side of the line crossing the two arcs. This now is point 2

    Repeat each step until you have all 2,3,4 points marked out on the left and right side of point 1 on your pattern.
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    Al .

    You don't know, what you don't know, until you know it.

  9. #8
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    more pics
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    Al .

    You don't know, what you don't know, until you know it.

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    and more pics
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    Regards
    Al .

    You don't know, what you don't know, until you know it.

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    Next with my dividers I get the measurement from point A to the point B and transfer this measurement over to the pattern. From point A on the right side of the line I draw an arc and the do the same on from point A on the left side of the line.
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    Regards
    Al .

    You don't know, what you don't know, until you know it.

  12. #11
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    Now with the dividers I get the measurement from transition height point to the point B and transfer this measurement over to the pattern. From point 4 on the right side of the pattern I draw an arc and the do the same on From point 4 on the left side of the pattern crossing the two arcs. This now is point B
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    Al .

    You don't know, what you don't know, until you know it.

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    I now draw a line from point 4 to point B and from Point A to Point B on both sides of the pattern.

    Now join the points at the top of the pattern, find something flexible that will enable you to get a smooth line through each of the points.
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    Al .

    You don't know, what you don't know, until you know it.

  14. #13
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    now add a lap on one side I usually add a 12mm lap on the right hand side
    Note that I have not added any flanges on this transition. If you require a flange add it on as shown in pic.


    Now you ready to cut pattern out and copy on to your sheet metal.
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    Al .

    You don't know, what you don't know, until you know it.

  15. #14
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    Once you have cut out your patterns your ready to start folding (break)
    For this exercise I will use the paper pattern
    I have added some red lines to show how its going to be folded. As its only light folds this can be done over the edge of a bench, angle iron edge, or use a sheet metal folder.
    The degree of folding will vary on what size and diameter you transition will be.
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    Al .

    You don't know, what you don't know, until you know it.

  16. #15
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    After both half patterns have been folded join them together and add your collar. If you have flanges fold them to suit.

    Thats it!!!
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    Al .

    You don't know, what you don't know, until you know it.

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