Where did I see compass drawing of 5 pt star?

Discussion in 'Tutorials and Tips' started by twoodsmith, Sep 9, 2008.

  1. twoodsmith

    twoodsmith

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    Does anyone know where I saw the videos on compass drawing things like a 5 pointed star or pentagon? there were other videos like this. I have searched fruitlessly. Thanks Terry!
     
  2. Joe Greiner

    Joe Greiner

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    No offense intended, but I doubt that anyone could know where you saw a video. Just because a video can be produced for such an effort, doesn't mean a video should be produced. Google [layout pentagon compass] provides several step-by-step instructions, including this one: http://www.hyperflight.com/pentagon-construct.htm

    As I said, no offense intended.;)

    Joe
     
  3. James McClure

    James McClure

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    6th Grade

    I remember taking a drafting class in the 6th grade and we did a 5 point star with a compass and straight edge. I had to do some googling, but this is the method we used:

    Draw a circle with two lines at 90 degrees to each other crossing in the centre. We'll use clock face directions here. 12 means towards the top, 3 means to the right, 6 means to the bottom, and, guess what, 9 means to the left. The lines you've drawn are from 12 to 6 and from 9 to 3.

    Divide the line from centre to 3 in half. This can be easily done by setting the compass at over half the distance and then drawing an arc from both the centre and 3 points. A line between the two crossings of the arcs, above and below the centre-to-3 line, will divide it in half.

    Place the point of the compass on the half way point of the centre-to-3 line and set the radius to reach the 12 point. Draw an arc through the 9-to-centre line.

    Draw one more arc with the centre at 12 and the radius set at the point were the last arc intersects the 9-to-centre line. Draw this arc through the initial circle. This radius is 1/5 of the circle.

    Use the above intersections as centre to find the other two points on the initial circle (the fifth is at 12).

    Connect the five points, each one with a point not neighbouring it, and there you're done!

    http://www.bbc.co.uk/dna/h2g2/A13083202

    Good luck!
     
  4. Ron Sardo

    Ron Sardo Guest

  5. CTutor

    CTutor

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    Star

    Ron. Draw a circle. Set your compass to the radius. Then put one point on the drawn circle and scribe and arc. Then put the pencil on the point where the arc crosses the circle and scribe another arc. Do the same thing again moving the pencil to the point where the arc intersects the circle. You'll end up with the star with rounded arms. I think that is ehat you wanted.
     
  6. Joe Greiner

    Joe Greiner

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    That produces a six-point star, not five point. But it's useful for laying out a hexagon.

    Joe
     
  7. pencheff

    pencheff

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    I think you saw that on the Wood Magazine site. It was the video companion to the article "No Math Geometry for the woodshop" from the September 2008 issue.

    I know I watched several of those videos when the magazine was still current, but I just tried to find them again and had no luck.
     
  8. derek atkins

    derek atkins

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    Have you tried google SketchUp ?

    I use this free program to work out quite a few of my segmented designs and using it to draw any size of N pointed star would be very easy. If you want to give a go you can download it from:-

    http://sketchup.google.com/

    Derek
     

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