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Scraping is fine finishing of largely rough-finished in order to smooth them, to correct defects of the form or to provide them with a pattern.
Scraping is highly qualified manual work and is applied only if the respective material cannot be fine-finished by machines.
Figure 1 - Scraping
Normally, plane surfaces should be finished by surface grinding, curved surfaces and bore holes by precision boring or honing. By scraping mainly sliding parts of machines are worked such as carriages and slide bearings which must show a high surface quality. With sliding surfaces, the recesses achieved have a positive effect since they enable an accumulation of lubricating oil.
An even lubricant film is required to reduce friction at these surfaces. By scraping also oil grooves are placed in domed brasses.
What kinds of workpieces are mainly treated by
scraping?
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When is the method of scraping
applied?
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