Mounting Procedure

• Be sure to remove burr, dent and dust from the mounting surface of the machine to which the LM Guide is to be mounted before installing the LM Guide. ( Fig.6 )

  Note) Since the LM Guide is coated with anti-rust oil, remove it from the reference surface by wiping the surface with washing oil before using the guide. Once the anti-rust oil has been removed, the reference surface is prone to getting rusted. We recommend applying low-viscosity spindle oil.

• Gently place the LM rail onto the base, and temporarily secure the bolts to the extent that the LM rail lightly contacts the mounting surface (align the line-marked side of the LM rail with the side reference-surface of the base). ( Fig.7 )

  Note) The bolts for securing the LM Guide must be clean.When placing the bolts into the mounting holes of the LM rail, check if the bolt holes are displaced.( Fig.8 ) Forcibly tightening the bolt into a displaced hole may deteriorate the accuracy.

• Secure the set screws for the LM rail in order with a tightening force just enough to have the rail closely contact the side mounting surface. ( Fig.9 )
• Tighten the mounting bolts at the designated torque using a torque wrench. (See Fig.10 , and Table1 and Table2 onRecommended Tightening Torque for LM Rails)

  Note) To achieve stable accuracy when tightening the LM rail mounting bolts, tighten them in order from the center to the rail ends.

• Mount the other rail in the same manner to complete the installation of the LM rails.
• Hammer in caps into the bolt holes on the top face of each LM rail until the top of the cap is on the same level as the top face of the rail.

• Gently place the table on the LM blocks and temporarily fasten the mounting bolts.
• Press the master side LM blocks to the side reference surface of the table using set screws and position the table. (See Fig.5)
• Fully fasten the mounting bolts on the master side and the subsidiary side to complete the installation.

  Note) To evenly secure the table, tighten the mounting bolts in diagonal order as shown in Fig.11 .

This method saves time in establishing straightness of the LM rail and eliminates the need to machine securing dowel pins, thus to drastically shorten the installation man-hours.

After temporarily fastening the mounting bolts, firmly press the LM rail to the side reference surface at the position of each mounting bolt using a small vice and fully fasten the bolt. Perform this in order from either rail end to the other. ( Fig.13 )

Using a Straight-edge

Place straight-edges between the two rails, and arrange the straight-edges in parallel with the side reference surface of the master LM rail using a dial gauge. Then, secure the mounting bolts in order while achieving straightness of the subsidiary rail with the straight edge as the reference by using the dial gauge. ( Fig.14 )

Secure the two LM blocks on the master LM rail with the table (or a temporary table for measurement), and temporarily fasten the LM rail and the LM block on the subsidiary LM rail with the table. Place a dial gauge to the side face of the LM block on the subsidiary rail from the dial stand fixed on the table top, then fasten the bolts in order while achieving parallelism of the subsidiary LM rail by moving the table from the rail end. ( Fig.15 )

Place the table on the blocks of the correctly mounted master LM rail and the temporarily fastened subsidiary LM rail, and fully fasten the two LM blocks on the master rail and one of the two LM blocks on the subsidiary rail with bolts. Fully tighten the mounting bolts on the subsidiary LM rail in order while temporarily fastening the remaining LM block on the subsidiary LM rail. ( Fig.16 )

Use a jig like the one shown in Fig.17 to achieve parallelism of the reference surface on the subsidiary side against the side reference surface of the master side from one end of the rail by the mounting pitch, and at the same time, fully fasten the mounting bolts in order. ( Fig.17 )

You can temporarily set a reference surface near the LM rail mounting position on the base to achieve straightness of the LM rail from therail end. In this method, two LM blocks must be joined together and attached to a measurement plate, as shown in Fig.19 .

After temporarily fastening the mounting bolts, use a dial gauge to check the straightness of the side reference surface of the LM rail from the rail end, and at the same time, fully fasten the mounting bolts.(Fig.20)

The following procedure is recommended for assembling model HR.

• Remove burr or knots from the LM rail mounting surface of the base using an oilstone. ( Fig.21 )
• Use a small vice to press the two LM rails to the base so that they closely contact the reference surface, then tighten the mounting bolts to the recommended torque (seeRecommended Tightening Torque for LM Rails). ( Fig.22 )
  • Check if any of the bolts has a sinking.
  • Use a torque wrench to tighten the bolts in order from the center to both ends.
• Mount the LM blocks on the table, then install them onto the LM rails. Be sure the mounting bolts for the LM blocks are temporarily fastened.
• Tighten the clearance adjustment bolt alternately to adjust the clearance.If a relatively large preload is applied in order to achieve high rigidity, control the tightening torque or the rolling resistance.
  a. It is preferable to use three clearance adjustment bolts for each LM block as shown in Fig.23 .
  b. To obtain a favorable result of the clearance adjustment, set the tightening torque of the two outside screws at approx. 90% of that of the enter screw.
• Secure each LM block by gradually tightening the two LM block mounting bolts, which have temporarily been fastened, while slid-ing the table. ( Fig.24 )

The procedure for assembling model GSR is as follows:

• Align the table with the reference-surface of each LM block and fully fasten the mounting bolts to secure the blocks. Both ends of the table must have a datum surface. ( Fig.25 )
• Place LM rail A onto the base and align the rail with a straight-edge. Fully fasten the mounting bolts using a torque wrench. ( Fig.26 )
• Temporarily secure LM rail B onto the base, then mount the blocks on the rail by slidingthe blocks.Temporarily fasten LM rail B while pressing it toward the LM blocks. ( Fig.27 )
• Slide the table a few strokes to fit the LM blocks to LM rail B, then fully fasten LM rail B using a torque wrench. ( Fig.28 )

If there are more GSR units to be assembled, we recommend producing a jig like the one shown in Fig.29 first. You can easily mount LM rails while achieving parallelism of the LM rails using the jig.

When two LM rails are to be used in parallel as shown in Fig.30 , first secure one LM rail on the base, and place a dial gauge on the LM block. Then, place the pointer of the dial gauge on the side face and top face of the other LM rail to simultaneously adjust the parallelism and the level, thus to complete mounting the LM rails.

When two or more LM rails are to be jointed, a special metal fitting as shown in Fig.31 is available. For such applications, specify this fitting when ordering the LM Guide (the rail will be tapped for attaching a joint fitting).

Installation Procedure

• Temporarily fasten the rail presser bolt.
• Secure rail A and the joint fitting with bolts C and D.
• Apply a dial gauge to side G of the joint between rails A and B. Adjust the left and right level differences using bolt E and set screw F on rail B. If bolt E is tightened, rail B will move toward b side. If set screw F is tightened, rail B will move toward a side.
• When the adjustment using set screw F is finished, secure set screw F with the nut.
• Adjust and secure the vertical direction using the rail presser.

When welding the LM rail, it is best to weld the LM rail while clamping it at the welding point with a small vice or the like as shown in Fig.32 . For effective welding, we recommend the following welding conditions. (During welding the LM rail, take care to prevent spatter from contacting the LM rail raceway.)

Note) If the temperature exceeds 750°C, the LM rail may be hardened again.