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To cut a large diameter round hole, make a glass disc or a ring, this simple tool will help.

It consists of only three parts. The dimensions of the steel rod Ø 5 mm depend on the size of the cut hole. For small radii, you can use a nail without a hat. A hole Ø 2,4 mm is drilled in its end face and an M3 thread is cut to a depth of 10 mm. The second part - a steel sleeve Ø 10 mm and a height of 5 mm is turned on the machine (it is permissible to use an M6 nut with an inner diameter of about 5 mm). Drill a radial hole in the middle of the side face and cut an M2,5 thread. And finally, the third, smallest part - the central stop - is made from a piece of the M2,5 screw. Sharpen its end and cut two flat flats with a needle file.

To install a conventional glass cutter with carbide rollers on a fixture, you will need to replace the M3 screw with a longer one - so that after assembly it protrudes by 5-7 mm.

Glass cutter-compass
Tool for cutting round holes in glass (click to enlarge): 1 - glass cutter, 2 - M3 screw, 3 - rod Ø 5 mm, 4 - central stop (M2,5 screw), 5 - sleeve (M6 nut), 6 - cardboard, 7 - glass

Having screwed the rod onto the screw of the glass cutter, put a sleeve on it and fix it at the required distance with the M2,5 screw, turning it with pliers by the flats. Then glue a square piece of cardboard to the workpiece, put the tip of the screw on it, and the glass cutter-compass is ready to work.

Author6 A.Kochanov, V.Kochanov

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