How to Polish Glasses Frames: Acetate, Plastic and Sunglasses (DIY vs Factory) Glasses and sunglasses frames are polished for one of two reasons: to bring a dull or scuffed frame back to something wearable, or to produce frames at scale where every unit has to reach the same finish. Those are different problems with different […]
How to Polish Titanium Parts Without Discoloration Titanium does not simply get “hot” and change colour. What happens is more specific: the surface reacts with oxygen at a temperature the metal reaches easily during mechanical polishing, and the oxide that forms has a colour. That colour is a process signature, not a cosmetic defect you […]
A connector contact is often a formed strip of copper alloy with a plated layer measured in microns, made in quantities measured in millions per month. Two facts follow from that. First, almost any mechanical removal process removes the plating before it removes the burr. Second, the parts are small, light and numerous enough that […]
A watch case is not one surface. It is usually two or three — a brushed flank, a polished bevel, and often a plated or coated area — and the value of the part depends on the boundary between them staying sharp. Mass finishing removes material everywhere the media touches, so the decision that matters […]
Surgical instruments are the hardest category to finish well with mass finishing, because the two things the process is good at — removing material evenly and reaching into geometry — are the two things that ruin an instrument. A cutting edge that is rounded by a fraction of a millimetre stops cutting cleanly. A hinge […]
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