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@Make a groove along the guide rail axis. Press the rail against the datum surface strongly to correct it.  When two rails are used, parallelism is secured easily if grooves are made simultaneously. AAlternative procedures are as shown below:  Make the widths of the installation grooves roughly, insert drill rods and rails into the grooves, and fix the rails while pressing the drill rods. (See Fig. 1.) BOther procedures as shown below:  Install a rigid plate on a planar base, and install the rail to fit this plate. (See Fig. 2.) CMake stages on the mating base with a planer or milling machine, press the datum surface of the rail against the machined surface with a vice or bolts and auxiliary plate, and fix the rail. (See Figs. 3, 4 and 5.) The guide rail and shift table have their own datum surface for correct installation. The datum surface of the guide rail is the datum mark side (side B). That of the shift table is the opposite side (side D) to the mark. ●Stage machining of installation datum part and  corner dimensions ■Installation Datum Surface ■Guide Rail Installation Adjustment Example Parts No. GR20・GRE20 GR28・GRE28 GR38 GR48 h1 3〜4 4〜6 5〜8 5〜8 h2 4 6 8 10 h3 6 8 10 11 r R1 R1.5 R1.5 R2 R mating corner R0.5 or less or recess R1 or less or recess Ditto R1.5 or less or recess (Unit: mm) r R h1 h2 h3 Parts No. GR20・GRE20 GR28・GRE28 GR38 GR48 W h 2〜3 3〜4 4〜5 4〜5 19.5 28 38 48 +0.08 +0.05 +0.08 +0.05 +0.08 +0.05 +0.08 +0.05 It is recommended that the guide rail be corrected before installation. The product alone has a bend of not more than 0.2 mm/m, which also applies to both the S and SE types. When it is installed on a base, the bend is corrected below 0.03 mm/m. After correction, adjust bend of the S type rail by means of clearance adjustment of the shift table. The SE type has an automatic clearance adjustment function and adjusts clearance automatically. ■Installation of Guide Rails Decide the datum surface on either rail, when two rails are used. W h Datum surface (Fig. 1) Datum surface (Fig. 2) Datum surface (Fig. 3) (Fig. 4) (Fig. 5) 2〜4mm Recess ●The clearance between the shift table and guide rail of the S type need be adjusted. ●The shift table of the SE type has an automatic clearance adjustment function. Installation and Adjusting Methods of S and SE Types Datum surface Datum surface 285Selection Guide Product Air Bearings Metallic Bearing Multi-layer Bearing Plastic Bearing Information Technical Corporate Profi le Information Slide Shifter Clearance adjusting side mark side (S Type only) Guide rail datum surface Shift table datum surface Datum mark side