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Today I continued work on drawing the backbone lines on the lofting floor. I finished drawing 7 station lines.

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Comment by Ricardo Aráoz on September 24, 2017 at 4:24pm

How to check that your station lines are perpendicular to the plywood edge:

- fix a length of string, with a pencil tied to the other end, to point where the station line crosses the ply edge (the station point) and mark the ply edge on both sides of the station point (both marks are the same distance from the point)
- fix a larger length (about twice as long or more), with a pencil tied to the other end, to one of the marks you just drew and draw a semicircular line nearby where you think the perpendicular should lie. Do the same with the other mark so that the semicircular line intersects the previous one. The perpendicular is determined by a line crossing both the station point in the edge of the ply and  the intersection of both semicircles.

The longer the strings, you'll get better precission.

Comment by Building Wharrams on September 25, 2017 at 12:25am
Hello Ricardo,
Thank you very much for your advice. I am going to follow your instructions to check the station lines.


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