Fixing Pistons and Cylinders

Sandpaper and sandcloth were things dedicated to polishing tools, and even in Luo Chong's technologically advanced past life, there was still nothing that could replace their function.

The problem they now faced was that although the Han Tribe already had a pedal-powered grindstone, this kind of tool was fine for sharpening blades or polishing the outer surfaces of objects, but trying to polish inner bores and similar parts was very difficult.

The sand-slurry agitation method used by the researchers was similar to modern sandblasting technology, but after all, it was not actual sandblasting, so he urgently needed a soft polishing tool like sandcloth to grind the inner bores of cylinders.

Even without knowing the manufacturing method, the structure of sandcloth was not hard to analyze. First, it needed a carrier, either paper or cloth, then a layer of glue brushed onto its surface, and finally a layer of fine sand stuck on and left to dry. In truth, it was just that simple.

Next came analyzing the materials for the carrier and the fine sand. First of all, no matter what this thing was, it definitely could not be elastic; otherwise, the grit stuck to it would inevitably break off due to stretching, and almost none of the Han Tribe's existing cloth could achieve this, so they had to use paper as the carrier.

Following that was the abrasive, meaning what kind of sand to choose. First, since they wanted to use this thing to grind steel, the abrasive had to be harder than steel. Searching among materials that met this criterion, it had to be easy to obtain, inexpensive, and have a hardness that reached the standard. After thinking for a long time, Luo Chong felt that only clay seemed to meet these standards.

Clay was everywhere, completely worthless,