Precision linear scales - JSC "Precizika Metrology" - #1

Text version of the page

Magnetic linear encodersi.pdf table.main {} tr.row {} td.cell {} div.block {} div.paragraph {} .font0 { font:6.00pt "Arial", sans-serif; } .font1 { font:10.00pt "Arial", sans-serif; } .font2 { font:47.00pt "Arial", sans-serif; } .font3 { font:7.00pt "Times New Roman", serif; } .font4 { font:15.00pt "Times New Roman", serif; } KEY SPECIFICATION Precizika Metrology Glass scale gratings are available in a variety of configurations. They are intended for applications where the user provides the scanning unit and the electronics to create a customized measuring or détection System. Glass gratings are available as linear scales up to 3400 mm length, as disco shaped scales with diameters of up to 400 mm, or in spécial géométrie configurations. The scale gratings are made of vacuum deposited chrome on a glass substrate. This process guarantees high accuracy and renders the scales extremely résistant to chemical and mechanical abrasion. In addition to the main incrémental track a second track with one or more référence marks can be applied. Thèse are used to establish référence positions along the main track. Absolute track with spécial grating patterns can be added also. Glass substrates are available in a variety of lengths, widths, diameters and thickness. Material Substrate material Thickness of substrate Tolérance of glass thickness Length/ width / diameter / tolérance Planarity Coefficient of thermal expansion selected float glass 1;1,5; 2,0; 2,5; 3; 4; 5; 6 mm. ±0,1 mm ±0,1 mm 10/im /100 mm 8x10-6/K Automated glass cutting machine Coating vacuum deposited chrome - Transmission - Reflection Clean room < 1%at 400-900 nm <60%at 400-900 nm Light transmission of incrémental scale pattern 45-55% ± 3% Acceptable defects in the graduation/référence mark area: - pinholes <02OO fjm or several smaller defects whose total area does not exceed this; - dots <02OO /jm or several smaller defects whose total area does not exceed this; - defects visible to the naked eye on the illuminated table are not critical; Acceptable defects in the surrounding area: - dots <0O,3 mm; llllllll! Illllllllllllll lil