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You can cut a perfectly round rubber gasket of any size or a belt for the tape drive mechanism of a tape recorder from a sheet of rubber using this simple device. In addition, it can be used to cut large diameter holes in plywood, plastic, plexiglass, cardboard and other similar materials.

Making it yourself is quite easy. From a sheet of plywood 10 mm thick, cut out three squares measuring 300x300 mm. Drill a hole d 8 mm in the center of one of them, and d 25 mm in the other two. By gluing the blanks, as shown in the drawing, we get the base of the fixture. In its central hole, fasten the M8 bolt with a nut.

Turn the central post from a brass bar d 12 mm and 80 mm long. Cut an external M12 thread at one end, and an M8 internal thread at the end hole on the other side.

The rotary sleeve has an axial hole d 12 mm and a threaded M10 perpendicular to it.

The carrier is a brass bar d 10 mm. At one end, a M10 thread 10 mm long is cut, and a radial hole M3 at the other end is made after reassembling the carrier with a rotary sleeve: it must be parallel to its hole d 12 mm.

The slider in the form of a corner is cut out of a duralumin bar. In its vertical wall, two holes d 10 mm are made - one under the carrier, the second, perpendicular to it and shifted down by 5 mm, - for the latch - a threaded pin with a semicircular groove. A groove with a section of 14x3 mm is sawn in the horizontal wall - under the knife. The material for its manufacture is a fragment of a hacksaw blade. In the vertical groove of the slider, the knife is fixed with a Mb screw.

The pressure plate is cut on a lathe from a metal plate 2 mm thick or a thicker sheet of plastic. Its central hole should have d 8 mm, and the outer diameter should be slightly less than the cut one.

The lock nut of the sleeve with M12 central thread has an outer diameter of 0 25 mm and a height of 15 mm. Saw a half-diameter transverse groove in it and make a longitudinal hole in this part. Then cut the M4 thread in its lower half, and drill out to d 5 mm in the upper half. Now tighten the halves of the nut with a screw, this way you can lock it in any position on the B-pillar.

Round cutter-universal
Device for cutting large diameter holes (click to enlarge): 1 - handle, 2 - carrier, 3 - M6 screw, 4 - slider, 5 - knife, 6 - center post, 7 - lock nut, 8 - swivel sleeve, 9 - spring, 10 - M8 bolt, 11 - pressure plate, 12 - workpiece, 13 - base, 14 - threaded pin-clamp

The order of assembly of the device is as follows. Screw the carrier with a threaded shank into the swivel sleeve until it stops. Insert the locking pin into the slider so that its cylindrical recess coincides with the longitudinal hole. Putting the slider on the carrier, insert a knife into its groove and tighten with a screw. Attach a rotating handle to the end of the carrier.

A workpiece is put on the bolt rod protruding from the base. A pressure plate is installed on it, and then a central rack. You can tighten the thread with a wrench - a radial hole d 5 mm is intended for this. A spring is put on the rack, followed by a carrier assembly and, finally, a lock nut.

Having adjusted the position of the slider on the carrier and the bushings on the rack (in height), you can get to work.

The dimensions of the main parts allow you to cut holes with a diameter of up to 240 mm on this fixture, however, if you need a larger size, it is enough to replace only three elements: carrier, base and pressure plate. And for quick adjustment of the device to a given size, vernier risks can be applied to the carrier.

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