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I became frustrated with traditional circle cutters so I came up with this & thought I would share it. With this design you don’t have to repeatedly adjust the position of the blade in relation to the pivot to adjust the diameter of the circles, instead of the blade moving the pivot moves along a line of pivot holes, the distance between the holes & the blade tip is pre-set to the radius of the circles to be cut. Instead of having to remove, turn around & adjust the depth of the blade to have the flat side of the blade on the correct side of the cut (to have a 90 degree “cliff“cut on either the outside or inside of the circle) you turn the whole cutter around 180 degrees & use the holes on the other side of the blade, then spin the cutter in the reserve direction. Each pivot hole is numbered in the order I use them for each rosette.
Great idea. One of the things that makes me nervous is not being able to see the blade while cutting but you mitigate that with the preset holes for the most part. Sneaking up on the line with a Dremel just makes me more comfortable.
Hi Jason, I draw a line 30mm either side of centre on the top were I want the channel to stop. If you look at the 3rd picture you can see faintly numbered cuts along the edge of the cutter. I turn the cutter & stop once the numbered cut on the side that corresponds with the hole the pivot is in reaches the line on the top (the either side of centre lines), its unimportant but it prevents the blade from cutting under the fingerboard (If that’s the line your concerned about cutting past?) As for keeping the cuts to the correct radius, so long as you don’t choose the wrong hole there is no need to creep up with the dremel. The cuts are every bit precise as the placement of the holes, it works without any need to see the blade & it eliminates any margin of error with setting up a cutter or dremel. PS-Some of the presets are just to cut lines between the furthest inner & outer cuts of the rosette making it easier when routing with the old Woman’s tooth, thanks for looking!.
genius thanks for sharing, i was thinking to make a purflin/ rosette rim cutter in one but now i see this it is less effort to make this one separate stefan how your cutting binding channels? Thanks in Advance
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