How to deal with and repair rust or slight scratches on the working surface of the fixed plate?

For rust treatment, anhydrous ethanol (industrial alcohol) or specialized precision instrument cleaner should be used immediately in conjunction with non-woven fabric for wiping. For stubborn rust spots, a small amount of precision rust removal paste can be applied and gently wiped off with a ultra-fine scouring pad (grade 0000) in one direction. After that, it must be cleaned thoroughly and immediately coated with anti rust oil to prevent the regeneration of rust. Remember to avoid using rough sandpaper for direct polishing to avoid enlarging the damaged surface.

For minor scratches, it is necessary to first determine the depth. If it is a hair like shallow scratch (without feeling when scratched by nails), natural oilstone or fine-grained grinding paste can be used in combination with engine oil for directional polishing repair. If the scratch is deep and touchable, it is forbidden to polish it deeply by oneself to avoid damaging the overall integrity of the plane. Professional manufacturers should be contacted to evaluate whether local scraping or machine tool reprocessing is needed to restore accuracy.

The core principle of repair is "maintenance first, repair as a supplement". After any processing, it is necessary to use a level or ruler to check the local flatness. Repair is just a remedy, the key lies in daily prevention: clean and apply oil after use, use protective pads when moving workpieces, and prevent dragging by hard objects. For high-precision calibration, it is recommended to have professional metrologists operate or return to the factory for processing.