Chapter Nine - Bridges, Braze-ons, and Final Touches

THE ALIGNMENT TABLE METHOD

Slide the bottom bracket over the shaft of the alignment table and tighten the large nut of the shaft to hold the frame tightly in place with the dropouts directly over the bed of the table. I would recommend about 80 to 100 foot-pounds of torque to hold the frame securely onto the inspection table. The frame itself can be used as a wrench to tighten the large nut and washer against the bottom bracket faces. Figure 9-21 shows the frame being placed on the alignment table.

Figure 9-21: Placing the frame onto the alignment table

Figure 9-22: Installing hub width cylinders on the dropout centering gauge

The plans for the Paterek alignment table include plans for a dropout-centering gauge. This gauge also comes with sets of different length cylinders. The cylinders should be marked with the width of the hub that they will simulate. Install the set of cylinders that match the desired rear hub width for this frame. Figure 9-22 shows these cylinders being installed. There is a V-shaped notch in this gauge that is placed against the seat or down tube close to the bottom bracket shell. The setscrew on the gauge is loosened so the top of the gauge is able to easily move up and down the shaft. When both faces of the V-shaped notch hit the seat or down tube, tighten the setscrew to prevent any further up and down travel. Setting the level of the gauge this way, transfers the centerline of the frame to the gauge. In turn, the ends of the hub width cylinders will be the desired distance from that centerline and can be used to determine dropout spacing. Figure 9-23 shows the height of the dropout-centering gauge being adjusted. (Several manufacturers of alignment tables provide a dropout-centering gauge with their tables.)

Figure 9-23: adjusting the height of the dropout centering gauge

Figure 9-24: Using the dropout centering gauge on the rear dropouts

The dropout-centering gauge can be moved toward the rear dropouts to see if it will slip between them. If the dropouts are not in a good position above the table to do this, loosen the large bottom bracket nut, shift the frame one way or the other to put the dropouts above the table, and tighten the large nut again. If the dropouts are not the correct distance from the centerline of the frame, the gauge will have trouble slipping between them. Figure 9-24 shows how the gauge is used to check for dropout width and centering.

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