I received these for cutting circles not knowing that it is geometrically incorrect for cutting small circles as the center of the rod would have to go through the cut to be geometrically correct its edge saw blade, which is obviously impossible. If you want to cut small circles with a jigsaw, you'll need a geometrically correct template, but it's so easy to shape that no one bothers to make it. Bosch used to make one for one of their expensive jigsaw puzzles and you can still find it online for over $100, but it clearly didn't sell well enough to keep making it. 1/4" plywood 1.5" wider than the bottom plate of the jigsaw and about a foot long (enough to cut circles about 20" in diameter) and a few sticks (e.g. pieces of plywood with a width by 3/4"). Make a "fence" to hold the jigsaw on one end of the plywood. (There are several websites with photos of variations on this type of jig, so I won't include photos here. ) You'll also need to make a hole (about 1/2 inch) for the blade to go through the plywood and draw a line from the bottom going through the cutting edge, saw blade and perpendicular to the "fence" side. a blade equal to the radius of the desired circle, so you can see that the jig holds the cutting edge of the blade a distance from the axis of rotation equal to the desired radius, and perpendicular to the radius passing through the cutting edge, or in other words, tangent to the circle metrically correct. Some people glue sticks in place, but I chose to bolt them together with #8x1" pan head screws inserted from the bottom. To do this, I had to clamp each stick individually with a C-clamp and drill all the pilot holes the way through the stick and plywood on top then put the screws through the bottom then remove the clamp and move on to the next stick Put the front and sides of the "fence" in place and it's so tight I didn't once had to attach the backing - I just press the jigsaw in place and it stays in place. Once the "fence" is in place drill a hole for the saw blade. I used a 1/2" "Used a wood drill bit and drilled part of the way from the top and the rest of the way from the bottom to avoid splinters on the bottom. Then below draw a line that passes through the cutting edge of the saw blade and is perpendicular to Toron"Fence". Pivot holes are placed on this line at the desired radius from the disc. The rest should be obvious.
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