Increasing the reliability of the grinder. Drawing, description

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Increasing the reliability of the grinder. home workshop

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Many home-made craftsmen working with metal have in their arsenal an angle grinder, colloquially referred to as a "grinder" (the name arose in the old "stagnant" times due to the fact that this power tool in the USSR was exclusively Bulgarian-made). With undoubted positive qualities (high productivity, ease of use, versatility, etc.), angle grinders wear out quickly and even break the teeth of the bevel gear pair. Buying the right set of gears and sorting out the gearbox is not a problem. However, this will not save you from re-repair in the future. It's all about lubrication, or rather, its insufficiency. During operation, the thick grease is distributed under the action of centrifugal force along the walls of the housing, divided into sectors by stiffening ribs, and thus is out of work.

It turns out that in order to improve the lubrication of the gear pair engagement zone, it is necessary to reduce the free volume in the gearbox housing. In this regard, I propose to make a simple but effective refinement of the housing: fill with epoxy resin the zones between the stiffeners in the housing, with the exception of the sector occupied by the drive gear. In order to prevent epoxy from shrinking and cracking, it will be useful to use it with a filler, however, to obtain a clean, smooth surface, the resin must be free of impurities here. Before pouring the compound, the surfaces of the housing should be degreased and cleaned with sandpaper. The distance between the driven gear of the reducer and the pouring surface should be 3 - 4 mm for normal operation. The proposed revision will improve the conditions for lubrication of a loaded assembly and simplify the replacement of lubricants in products and even compensate for some losses if you have to use another one instead of a regular lubricant, for example, Litol-24.

The proposed method of finalizing the gearbox housing unambiguously increases the service life of its gear pair - it has been tested on our own experience, so I safely recommend it for repetition.

Increasing the reliability of the grinder
Filling the gearbox housing "Bulgarian" with epoxy glue

It's funny, but in the same way, moderately worn out shoe soles of a honeycomb structure can be repaired. For a pair of shoes, you will need a quarter to a third of a tube of rubber sealant and an extrusion gun. Before repair, you need to clean and degrease the honeycomb in the heel area with a solvent. Adding a filler to the glue when working with a gun is problematic, and not necessary: the shrinkage of the sealant is not critical here.

And the last advice: it is advisable to time such improvements to the end of larger works with adhesives and sealants in order to fully use their residues from the packages.

Author: S.Kavaderov

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