Strange squeaky sound from the hand piece inside interrupted me from the grinding and polishing work on the desk, so disassembled I it so carefully as not to destroy precision parts, the origin of the noise was the core less motor driving shaft supporting bearing, very small miniature bearing was mounted there! It was clear that the mechanical capacitance is far from enough to support it, the lack of lubrication in the moving bearing dictates the life of the motor hand piece unit. Basically the ball bearing construction requires oil lubrication in wet condition, motor driving shaft supporting circumstance dose not fulfill the requirement at all. The designer should prepare the oiling way to be reachable to the bearing point from the outside without disassembling mechanically.
Any machinery and device were so designed to be continued long by some adequate maintenance at least before the WW2, but nowadays, all of the civilian's good are mass produced to be broken after 5 to 6 years use, intentionally, so constructed and flowing in the commercial distribution economy as a matter of fact. This is the resulting conclusion of the mass production and mass consumption.
I do not agree this kind of tendency at all, something should be wrong? I should replace the motor supporting bearings by myself, if possible.
Consequently, found out a very cheep, 1/10 price, hand piece Korean made in the Web site, just only replacing hand piece is my intention, so did I.
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