Scrapers are made up of tool steel or alloy steel and the cutting edge of the scraper is hardened and tempered. They are mainly used to scrap metal surfaces by rubbing the work surface. They also produce a bearing surface, which has been filed or machined earlier.
The scrapers are used as hand-cutting tools for removing metal from surfaces in the form of thin slices or flakes to produce smooth and delicate textures. The scrapers are made in a variety of lengths from 100 mm upwards and have many shapes depending upon the type of work to be done.
Some types of scrapers according to the shape are commonly classified as follows.
Engineer’s Flat Scrapers
Flat scrapers are commonly used for removing slight irregularities on a flat surface. When the surface has been scraped with strokes in one direction, it must be scraped with strokes at 90° to the first ones.
Hook Scraper for Metal
If the tip of a flat scraper folds at 60°, then it makes a hook scraper. It has its cutting edge inside, i.e. we use it for the scraping by the pull. Hook scrapers are widely used for scraping minor job work in fitting shops.
 Triangular Scraper
These are generally used to finish bearing in the same way as the half-round scraper, but since they come to a sharp point at the tip. They remove the burrs at the edge of small holes, where a half-round scraper could not enter. The faces of the scraper are hollow grounded to give the tool three cutting edges, which are simpler to -sharpen than the edges of the half-round scraper.
Engineers Hand Scrapers Half-Round
These types of scrapers are widely used for scraping internal cylindrical surfaces. They are used to remove high spots in the bore and bearing to give the right type of fit to the mating shaft or journal.
Scrapers are stored carefully to protect cutting edges from damage.