DIY belt sander

A belt grinder performs the final processing of parts - their final grinding. The main area of ​​use of the tool is the furniture industry, the processing of wooden parts. But they can also process metal elements using the appropriate abrasive material.

Using a belt-type grinding machine, the surfaces to be treated are leveled, their roughness is brought to the level required before coating. They also eliminate minor defects: grooves, burrs, elevations of surfaces, influxes of varnish, primer. The tool can round corners. It is suitable for machining round and tubular parts.

The working tool in the grinding machine is a tape with abrasive powder deposited on its surface. It is made endless, placed on two rotating drums - master and driven.

The driving drum is driven by an electric motor, which transmits rotation to it due to a belt drive. The tape can be placed vertically, horizontally, at an angle. The machine has a device for controlling the speed of the tape.

Having decided to make a belt grinding machine yourself, you need to decide: with the maximum length of the surface to be machined in detail; which table to make (movable, motionless) or to prefer a free ribbon and refuse to make a table. In the design of the machine, it is necessary to provide an exhaust device to remove a large amount of dust that is generated during its operation.

The main parts of the belt-type grinding machine, which will have to be prepared or made, are: a bed, an electric motor, rollers. A motor, for example, comes from a washing machine that has already reached the end of its useful life.

The bed of the future machine can be made of sheet metal - its dimensions can be, for example, 50x18x2 cm. One side of the plate is made even - this is necessary due to the attachment of a platform with an electric motor to it. The platform for the motor is made metal in the form of a plate measuring 18x16x1 cm and attached to the bed with several bolts.

The electric motor used has a power of 2.5 ... 3 kW, is capable of providing a rotation speed of 1500 rpm. The speed of movement of the belt during grinding should be 20 m / s. On this basis, the diameter of the pulleys is made equal to about 20 cm. Under such conditions, in the craft, you do not need to arrange a gearbox, which makes it cheaper.

The shafts of the driving drum and shaft are connected directly; slave arrange free rotation, placing it on the bearings.

Pulleys for a home-made belt-type grinding machine can be made of square billets from chipboard. Central holes are drilled in them, combined, gluing, to a thickness of 24 cm. Then the bag is pierced, giving it a cylindrical surface with a diameter of 20 cm. In this case, the central part of the pulleys is convex, increasing the diameter by 2 ... 3 mm when grooving.

The latter will allow the tape to stay exactly on the pulleys and not slide off them. The slippage of the tape is eliminated by winding a layer of thin rubber onto the surface of the driving drum.

A sanding belt is made of a width of 20 cm from a sheet of sandpaper. Stripes are cut from the latter and glued back to back to the required length.

Watch the video: DIY Belt Sander Grinder Using Bicycle Hub (February 2020).

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