I was trying to draw an arc with a radius of around 2.4m and thought there has to be an easier way.
The usual method is to bend a metre rule but I was a little obsessed with it being symmetrical and a true arc.
I came up with this and hope it helps others. It involves very little maths and is ideal for situations where you have two endpoints AB and the offset CD from the centre of the curve to the line running between the points.
Once I clamped two rules together with a T bolt to lock the angle, I then slid the rules over two nails .
The pencil sits in the nock between the rules or straight edges, the straight edges ride on the nails.
Next challenge is to do it as a router jig.
The usual method is to bend a metre rule but I was a little obsessed with it being symmetrical and a true arc.
I came up with this and hope it helps others. It involves very little maths and is ideal for situations where you have two endpoints AB and the offset CD from the centre of the curve to the line running between the points.
Once I clamped two rules together with a T bolt to lock the angle, I then slid the rules over two nails .
The pencil sits in the nock between the rules or straight edges, the straight edges ride on the nails.
Next challenge is to do it as a router jig.
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