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Nicolás Correa Service, S.A. Blog

Do you know what scraping adjustment is and what is it for? NC Service shows you in this example.

August 2018
Author: NC Service
Company: Nicolás Correa Service, S.A.
Do you know what scraping adjustment is and what is it for? NC Service shows you in this example.

The scraping process is an adjustment, manually carried out by means of a tool called “scraper”, which aim is to adapt two flat or curved parts for them to slide each other with the most perfect contact possible. This is a very delicate and important process in the refurbishment of a milling machine since during its use, the constant movement of axes and other elements produces a damage that eventually may cause machining problems.

In the particular case of guides’ saddles wear in each axis (X,Y,Z), this adjustment process carried out during the retrofitting of a milling machine, becomes an essential work bound to prevent possible plays that may affect the accuracy of the machine. Thus, during the refurbishing phase, the grinding of guides’ saddles of all structural elements is performed in first place, seeking a surface as flat and uniform as possible in each one of them. However, performing a manual scraping of all these elements becomes necessary in order to obtain their total adjustment and to assure that all axes meet geometry. The main purpose of this manual scraping of two pieces that have to slide together is, on one hand, to ensure a perfect sliding and adjustment necessary for each function. On the other hand, making small cracks so that the oil could flow through these two pieces in continuous friction will prevent them from being completely smooth and end up seizing.

To carry out this scraping process, the surface where the piece to adjust slides is painted with a fluid paste (Prussian blue) by NC Service’s experienced technicians. This paste is ideal to check adjustments of moulds and dies, among others, and marks the irregularities of the surfaces with a micrometric thin layer. The parts are assembled in the milling machine to make them slide together, and after dismantling, the paint remaining on the surface of the part to be adjusted will mark those areas with the greatest friction. This will allow the technician to determine the need for adjustment and, if necessary, will show him where to make it, focusing in the most prominent areas marked in blue. If these parts have a uniform contact, except in the oil drain zone, and allows displacement, then we can say that they are well adjusted.

In this video we show you the scraping and adjust the Z-axis iron plate at NC Service.

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