Petrol sawing machine. Drawing, description

BUILDER, HOUSEHOLDER
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Petrol sawing machine. Tips for the home master

Builder, home master

A joyful event - the acquisition of a garden plot - is often overshadowed by the lack of an electrical network in this undeveloped territory. It was in such a situation that I made a gasoline-powered sawing machine, which makes it possible to speed up the process of building a house.

One more function of the machine - work in the mode of the generator of the electric power. I think that such a universal installation will be of interest to many amateur builders.

Technical characteristics of the sawing machine-generator:

Engine: D-6
Power, l. p.: 1,2
Maximum cutting depth, mm: 90
Feed speed (when sawing pine boards 50 mm thick), m/min: 1,5
Fuel consumption: when sawing, l/h: no more than 0,5
when working on a G-424 generator with a power of 150 W, l / h: up to 0,25 (depending on the load)
Voltage, V: 12
Dimensions, mm: 850х400х550
Weight, kg: 26

The basis of the design is a frame from a road bike, cut off from above. It is fixed with M8 screws on two long steel supports made of profiles of the "corner" type, installed parallel to each other. These supports, in turn, are attached with M6 screws to the tabletop of the workbench. A saw blade with a diameter of 250 mm is mounted on a hub from a bicycle front wheel using four M4 screws. On the other side, an asterisk (Z=10) is soldered to the bushing, made from the drive sprocket of the D-6 engine.

The power plant of the machine is the D-6 engine. The clutch control mechanisms have been removed from it. Starting is done with a starter from a Druzhba chainsaw. To do this, a Ø 21 mm hole was drilled in the engine cover covering the magneto - a ratchet passes through it and is screwed onto the shaft of the crank mechanism. To install the starter, a bracket-spacer made of a 28 mm thick board is used. Four M4 mounting screws also pass through the holes in the magneto cover.

The throttle control handle and gas tank are mounted on wooden racks. To fix the position of the throttle valve, a steel plate with an M5 thread for the lamb is brazed on the outer sleeve of the handle. The transmission of torque from the engine to the saw blade is carried out by a chain drive.

Rice. 1. Petrol-powered sawing machine-generator (click to enlarge): 1 - muffler, 2 - bicycle frame, 3 - cross link (board 20x180x400 mm, 3 pcs.), 4 - throttle control handle, 5 - handle lock plate ( steel), 6 - M5 screw, 7 - saw blade, 8 - sprocket bracket (2 pcs.), 9 - workbench tabletop (plywood, 16 mm thick), 10 - longitudinal connection ("corner" 50x50 mm, 2 pcs.) , 11 - chain, 12 - drive sprocket (Z=10), 13 - spacer bracket, 14 - chain, 15 - saw blade groove, 16 - gas tank, 17 - restrictive board (40x200x400 mm), 18 - D-6 engine , 19 - bicycle hub, 20 - generator mounting clamps, 21 - G-424 generator.

Rice. 2. Mounting unit of the bicycle hub (click to enlarge): 1 - driven sprocket (Z=10), 2 - longitudinal link, 3 - hub, 4 - M6 screw, 5 - countertop, 6 - bracket, 7 - saw blade

Petrol sawing machine
Rice. 3. Drive sprocket fastening unit: 1 - drive sprocket, 2 - key 2x2, 4x4,5 mm, 3 - segment key, 4 - shank of the crank mechanism, 5 - M8 screw, 6 - drive gear

Petrol sawing machine
Rice. 4. Mounting unit of the driven sprocket on the generator: 1 - M12 nut, 2 - driven sprocket, 3 - segment key, 4 - generator shank, 5 - bushing

Petrol sawing machine
Rice. 5. Ratchet for starting the engine with a starter

Petrol sawing machine
Rice. 6. Bracket-spacer: 1 - pad (steel, thickness 2 mm), 2 - screw 3x2 mm (6 pcs.)

Petrol sawing machine
Rice. 7. Schematic diagram of the generator connection

The frame of the circular is completely wooden: the tabletop is made of a sheet of plywood 16 mm thick, the legs are made of bars with a section of 50x50 mm. The rigidity of the frame is provided by braces. The required sawing width is set by a restrictive board (40x200x400 mm) with two transverse grooves for wing screws. During cross cutting, the limit board is removed and the bevel tooth blade is replaced with a straight tooth saw blade.

The transfer of the machine to the generator mode is carried out in the following way. The G-424 generator from the Dnepr motorcycle is fixed with clamps to the transverse boards between the legs of the workbench. A drive sprocket (Z=10) is mounted on the key on the shank of the engine crankshaft using a screw. A chain is stretched between it and the generator sprocket. The clutch cover is then removed. For the operation of the generator, it is necessary to use a relay regulator, and connect a battery or a battery of series-connected elements with a total voltage of 12 V to the excitation winding. If a battery is used, it will be recharged when the generator reaches nominal speed.

It is necessary to operate the sawing machine outdoors, orienting the gasoline-powered unit in such a way that the wind carries the sawdust away from the air filter. Installing a protective screen would reduce clogging.

More than five years of experience on such a machine proves its reliability, but the absence of a fan and deflector on the engine causes overheating under heavy load. Therefore, in order for the engine to have time to cool, it is necessary to work in an intermittent mode. When paired with a generator, the load is much less and overheating does not occur.

Author: V.Soloviev

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