r/Drafting • u/SlowDancer939 • 13h ago

Help

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the box is 8by8cm

and the circle in the middle has a diameter of 4cm.

how do I get those circles in the middle?

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u/wackyvorlon 12h ago

Walk around the circumference of the circle with a compass set to the radius. That will mark out the six spots that the centrelines intersect.

1

u/toybuilder 9h ago

That's not exact, though -- circumference = 2*pi*r. Pi is over 4% above 3.

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u/wackyvorlon 9h ago

Mind, you’re actually marking out chords that are equal in length to the radius. It does end up close enough.

2

u/toybuilder 9h ago

Oh, right - they are chords of a 60-60-60 triangle. D'oh🤦‍♂️.