The drum is a small stationary machine tool for grinding, sharpening, stripping and polishing. (Non-contractual photo, does not necessarily reflect the drawing)
For this work, it is placed at the end of an axis, sometimes with a mandrel,
- either a grindstone,
- a wire brush,
- a polishing disc made of felt or cotton.
The axis carrying the accessory is rotated by means of a small central motor supplied with 220 V or 380 V.
Motor of the drum
An electric motor with a power of 1/2 hp and rotating at 3,000 rpm drives the axis, at the end of which can be attached grinding wheels, variable grain size, metal brushes or polishing discs. Choose the grain of the wheel according to the work to be done and according to the grinding precision you want:
- a coarse grinding wheel is used for deburring,
- a very fine grain, allows to finish sharpening, operation that must be completed most often by hand - especially for wood chisels, chisels and gouges - with a stone oil.
Among the accessories also exist polishing discs, which will allow you to easily revive the shine of metal or light alloy objects, after having stripped them. Use a special paste, called polishing paste presented in pot or bread, which will be coated disc, it being rotated.
Turning on the grinding drum
First attach the drum to a worktop near the workbench (or on the workbench). The support must be stable, possibly consolidated.
On the base of the device are four dwellings to receive the screws that will hold it securely. Also, choose a definitive place, and double, if necessary, the worktop of a piece of wood to screw the reel.
The starting and stopping of the machine is done by means of a light switch. Provide a power outlet near the machine for avoid extensions, always cumbersome and dangerous in a workshop. Always unplug the machine after use.
Precautions for use
Before changing accessories, always disconnect the plug from the device, the switch does not provide sufficient security. Starting the engine during such an intervention could cause a serious accident, especially if the machine is at that time a wheel or a wire brush.The mounting of an accessory is done by screwing on a left thread, this to prevent the tool from loosening when it is rotating, or by locking in a mandrel.
Before sharpening a tool, mount the protective glass and wear special glasses; it is imperative to observe these safety instructions It is impossible to avoid splashes of metal particles and grinding wheel grains, which cause serious eye injuries.
Present the tool to sharpen on the sharpening support, whose inclination will be adjusted to about 25°. Gently press the blade of the tool into contact with the grinding wheel.
The sharpening support must not be too far away from it, as the tool to be sharpened may then be driven into the housing of the machine, causing the wheel to burst and possibly causing a serious accident.
Never try to stop the wheel with an object (Of course not with the hand, even if the machine is running at low speed): thinking about stopping it faster, you would actually cause the wheel to be off-center, which would distort your sharpening work.
After use, store the accessory to protect it from dust and shock.
Maintenance and repair
Well used, this machine does not pose any particular problem. Clean it regularly and, if it is not to be used for a certain time, cover it with a little cover.
We find in the trade a special stone which will allow you to straighten the wheel if it has been deformed as a result of misuse.
When the wheel is oval, or its diameter falls below the rating tolerated by the manufacturer, replace it.
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