Profile Rail Design Recommendations/Guidelines

1. Mounting Shoulder Height and Corner Fillet

In order to provide a register to align the rail or the runner blocks, mounting surfaces should be machined according to the diagram (See Image 1.1 in Figure 1 Below) with shoulder height and corner radii dimensions as shown in the accompanying table.

MODEL NO. CORNER RADIUS R (MAX) RAIL TRACK SHOULDER HEIGHT H5 SLIDE UNIT SHOULDER HEIGHT H6 H1
NH-15 0.5 4 4 4.6
NU-15 0.5 4 4 4.6
NU-20 0.5 3 4 4
NH-20 0.5 4 4 5
NU-25 0.5 3 5 4
NH-25 0.5 5 5 6.5
NH-30 0.5 5 5 7
NU-30 0.5 5 5 7
NH-35 1.0 6 6 8
NU-35 1.0 6 6 8
NH-45 1.0 8 8 11
NU-45 1.0 8 8 11
NU-55 1.0 9 0 12
NH-55 1.0 10 0 12
NH-65 1.0 10 10 14

2. Indication of Reference Edge

Nook Precision Profile Rails have a reference edge on both the rail and the runner block. (See Image 1.2 in Figure 1 Below).

3. Installation of Rail and Runner Blocks

Use any one of the three methods shown in See Image 2 in Figure 1 Below.

The locking set screws should be positioned at the same location as the mounting bolts.

Better alignment is obtained by machining reference edges for both runner block and rail. For optimum performance, the accuracy of the mounting surface should equal that of the rail.

NOTE: Care should be taken when removing the runner block from the rail to avoid balls deflecting the ball retainers and thus falling out.

4. System Design Configurations for Nook Precision Profile Rails

Shown below in Image 3 in Figure 1 are various installations for profile rails systems. One through four are the most common. Five through eight are for limited height applications. Number nine is the least accurate.

Figure 1