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Accuracy of processing

Repeatable accuracy (error) Δ of the sizes with the same name in a kit of parts for ET–technology reaches 2 micron.

di (Pi, Ni) — the size measured in conjugate points

Δ = max di – min di <2 micron

Fig. 1 Dimensional variation

The error of copying of the form with ET-technology is carried out at small face (3... 10 micron) and lateral (10. 30 micron) interelectrode gaps that allows not to carry out in most cases labour-consuming iterative correction of the form and the sizes of a working part of the tool in the course of technology elaboration.

Fig. 2 Small holes in stainless foil

Accuracy at copying of a regular relief from the end face of the electrode to a part is in a submicron range and reaches 0,5... 3 micron

 

 

Fig. 3. The general view of a face surface of the electrode from brass with regular lines of micro-irregularities (Ra 0,8... 1,25), left by a grinding wheel (a) and the general view of the processed surface of the part (b) from the tempered chromium steel on which a microprofile of the end face of electrode was copied after processing.

Formation of functional edges of grooves, apertures and cutting edges of tools with radius less than 1 micron is possible by copying.

Fig. 4. The general view of a knife (scalpel) for eye microsurgery (a) and a profile of a cutting edge of a scalpel for microsurgery from chrome-molybdenum steel (corner radius of a cutting edge 300. 500 nm), a surface roughness of the cutting edge Ra is 0,00174 micron (b)

High accuracy of locating is provided by using at the machines of the “ET” series of unified machining attachments for locating and workholding of a blank and instrument by “EROWA” system. (http://www.erowa.com) The setting error is 2 micron.