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Homemade universal drilling machine made of photo enlarger

Photo enlarger drilling machine

Homemade universal drilling machine made of photo enlarger On this homemade drilling machine made from a tripod of a photo enlarger and the drive of an old sewing machine, in addition to drilling, it is possible to grind and polish, as well as mill with small disc cutters. Such wide possibilities are provided by turning the working mechanism of the drilling machine relative to the tripod at 90 or 180. The use of an electric motor with a rheostat (pedal) from a sewing machine allows you to adjust the speed from almost zero to 700 or 1400 rpm (the upper limit is due to the pulley used).

In addition, the tripod can rotate 360 around its axis, which further expands the capabilities of the machine.

This model uses a tripod with a lifting mechanism and a bracket from the UPA photo magnifier. The remaining parts of the magnifier are removed.

As a drive, an engine with a rheostat from a sewing machine TULA type SHE-1, with a power of 18 watts and a rotation speed of 4000 rpm, is used. The small engine power is compensated by a significant gear ratio on the pulleys, so the shaft torque is quite sufficient for drilling holes up to 6 mm in diameter in ferrous and non-ferrous metals. The drill chuck up to 6 mm is taken from a hand drill.

Details of a homemade drilling machine

Part Name Number Material
1 Shaft 1 Steel
2 Small driven pulley 1 Duralumin
3 Large driven pulley 1
4 Bushing 1 Steel
5 Nut 1
6 Bracket 1
7 Corner 1
8 Hairpin 2
9 Bracket 1
10 Housing 1
11 Bearing 60029 2
12 Key 3x4x20 1
13 Nut M8 1
14 Spring washer 8 1
15 Screw M6 1
16 BoltM8 2
17 Photo Enlarger Bracket 1
18 Support* 1 Tree
19 Drive pulley* 1 Duralumin
* not shown in the assembly drawing.

The drawings show the device of a homemade drilling machine. The corner (7) with studs (8) is bolted M8 (16) to the lifting mechanism of the photo magnifier (17) (instead of the removed parts of the photo magnifier).

Homemade drilling machine
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The housing (10) is inserted into the bracket (6) and fixed with a nut (5). Then bearings (11) are inserted into the housing on both sides. Please note that the bearings used have a protective washer. They should be installed in the housing with the washer out. Next, the housing is strung on the shaft (1), then the sleeve (4) and both pulleys (2, 3) are put on the shaft. All this is tightened with the M8 nut (13) until the backlash in the bearings disappears, while the shaft rotation should be easy, without jerks and passes. Excessive, as well as weak tightening are undesirable.

The assembled structure is bolted M8 (16) to the corner (7) at the required angle by combining a pair of corner pins (7) and the corresponding pair of holes in the bracket (6).

A pulley (19) is put on the motor shaft. A bracket (9) is attached to the engine housing on four MZ screws, which, in turn, is fixed with an M6 screw (15) to the bracket (6).

Photo enlarger drilling machine
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The slot in the bracket serves for the convenience of belt tension.

The motor and the rheostat are connected as in a sewing machine. A switch is connected in parallel to the rheostat, which allows you to turn on the machine by shunting the rheostat.

To increase the strength of the structure, a support (18) made of steel sheet is screwed to the inside of the suitcase lid on M5 screws.

The drilling machine is ready to work.

When disassembling the storage machine, it is only necessary to unscrew the bracket from the corner, remove the bracket with the motor and remove the tripod from the socket in the lid.

All the details fit perfectly in the suitcase. The use of a more powerful motor (90 W, 6000 rpm) will allow the use of drills with a diameter of up to 9 mm. At the same time, a cone is drilled on the shaft instead of the M10x1 thread for the corresponding cartridge.

Note: In the manufacture of drilling machine parts, special attention should be paid to the body and shaft, because the amplitude of the runout of the machine shaft during drilling and milling will depend on the quality of their manufacture. In order to minimize runout, it is necessary to install bearings with the minimum possible clearance or a small tension, and when processing the landing surfaces of the housing and shaft under the bearings, their alignment must be ensured.

For safety reasons, we recommend closing the belt drive with a removable protective cover.

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