After reading about using a sector in regards to woodworking layouts...I wanted to learn to work with one. They are measurement and layout tools, from the 1700s, used in conjunction with a compass or divider. After checking for sectors to buy...and finding very little available...I looked for info on how to make a sector from scratch, I ran into Christopher Schwarz' short video about making a sector from a "crappy folding rule"...
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I had an old folding rule...a vintage Rabone 1380...I decided to convert it. |
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Secured the Rabone on the MFT3... |
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Used Rotex 90 with 80x paper... |
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...an sanded off all of the Rabone markings. |
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The sanded unit ready for layout... |
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I laid out and centered a circle over the hinge pin in the brass joint hardware. |
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Drilled a 1/16 inch hole in the pin...very shallow... |
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Used the hinge pin hole to start my layout with a pair of calipers...continued out and marked lines with a knife. |
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The halfway point hinge hardware had to be passed over with a doubled distance... |
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After running a pencil line in the knive slices to help with the visual, I numbered the divisions, I had read that more than 13 divisions is not necessary...I had 15 divisions... |
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First use...to find the halfway point on a piece of wood...grabbed a napkin box, laid out the sector so that the 10 marks were at the edges of the board... |
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then, without moving the sector, set my divider to the 5 marks...proportionally 1/2... |
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Then stepped that divider distance out on the board...giving me the halfway point...confirmed in the opposite direction... |
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