I do a decent amount of production work on my Shapeoko so while taking a ruler and marking the center using the corner to corner technique is not very time consuming, I’m looking to optimize.
Does there exist a ruler that has a right angle that can lay in the corner of the stock and a pivoting ruler that can quickly swing to the other corner? I tried googling for this with no avail. Perhaps I just need to make this?
I like where your mind’s at - that would work well potentially to find the center line, but for the center point I would need apply a center line both horizontally and vertically. It might work on some smaller applications, but for longer ones doesn’t make sense.
That tool looks like it bisects the angle to find the center of a larger angle. If I have a rectangle that would give me a 45deg which is not the diagonal to the opposite corner.
I use a folding ruler as you describe — does that not work for you? Just have to put the pivot point of the rule at the corner — easy if you get one which has a hollow hinge:
I use a center finding ruler and the corner method. The first corner I use the center finding scale with zero about the center and draw a 2 inch mark and the other corner aligned to the corners and draw short line to define the center.
First pass at designing what I want. I ordered some “Chicago Screws” from amazon to connect to two pieces. This is the bottom view so the rabbited corner will fit on the stocks top corner and the ruler will pivot on the hole in alignment with the corner.