3 Use the 1/4-20,hex-head screws that are included with the bench couplers to attach the couplers to the legs of the benches,as shown.Do not yet tighten the screws. 4 Insert one of the leveling screws,rubber foot down,through the threaded hole in each coupler. 5 By adjusting all five leveling screws(one on the laser alignment bench,two on the optics bench,and two on the bench couplers),align the two benches so they are in a straight line.Use a meter stick or a long straight edge on top of the benches to check vertical alignment,and on the side of the bench to check horizontal alignment. 6When the benches are aligned,tighten the locknuts on all the leveling screws,and also tighten the four hex-head screws.After tightening the screws,recheck the alignment. To Align the Laser(so the laser beam is coincident with the optical axis of the bench): 1Place a piece of masking tape or tape a piece of paper over the square hole on the front of a component holder,as in Figure 6.Make a small dot on the tape or paper,in the center of the square hole (1-inch from the top of the component shelf and 1.5-inch from the edge of the component holder). dot 2Place the laser on the alignment bench,as in Figure 5.Center the laser on the bench,and make sure it is reasonably parallel with the bench. 3Place the component holder on the optics bench,about 10 cm from the laser aperture.Make sure that the component holder is flush against the alignment rail of the bench.The dot on the tape now marks the optical axis of the bench. 4 Turn on the laser,and move the aperture end of the laser Flgure 6:Locating sideways,as needed,so that the laser beam falls on the dot. the Optical Axis 5Move the component holder about 90 cm away from the laser aperture.Again,be sure the edge of the component holder is flush against the alignment rail of the bench. 6Without moving the aperture end of the laser,move the rear end of the laser as needed to recent the laser beam on the dot.(You may also need to adjust the leveling screws on the laser alignment bench in order to center the laser beam vertically on the dot.) 7 Repeat steps 3 through 6 until the laser beam is aligned with the dot for both positions of the component holder. The Component Holders Each optics system includes several of the standard component holders that attach magnetically to the optics bench,as in Figure 7.Components mount magnetically onto either side of the component holders.For proper alignment of the components along the optical axis of the bench: DMount the component holder flush against the alignment rail of the bench,as in Figure 7. >7 ③ Use the 1/4-20, hex-head screws that are included with the bench couplers to attach the couplers to the legs of the benches, as shown. Do not yet tighten the screws. ④ Insert one of the leveling screws, rubber foot down, through the threaded hole in each coupler. ⑤ By adjusting all five leveling screws (one on the laser alignment bench, two on the optics bench, and two on the bench couplers), align the two benches so they are in a straight line. Use a meter stick or a long straight edge on top of the benches to check vertical alignment, and on the side of the bench to check horizontal alignment. ⑥ When the benches are aligned, tighten the locknuts on all the leveling screws, and also tighten the four hex-head screws. After tightening the screws, recheck the alignment. To Align the Laser (so the laser beam is coincident with the optical axis of the bench): ① Place a piece of masking tape or tape a piece of paper over the square hole on the front of a component holder, as in Figure 6. Make a small dot on the tape or paper, in the center of the square hole (1-inch from the top of the component shelf and 1.5-inch from the edge of the component holder). ② Place the laser on the alignment bench, as in Figure 5. Center the laser on the bench, and make sure it is reasonably parallel with the bench. ③ Place the component holder on the optics bench, about 10 cm from the laser aperture. Make sure that the component holder is flush against the alignment rail of the bench. The dot on the tape now marks the optical axis of the bench. ④ Turn on the laser, and move the aperture end of the laser sideways, as needed, so that the laser beam falls on the dot. ⑤ Move the component holder about 90 cm away from the laser aperture. Again, be sure the edge of the component holder is flush against the alignment rail of the bench. ⑥ Without moving the aperture end of the laser, move the rear end of the laser as needed to recent the laser beam on the dot. (You may also need to adjust the leveling screws on the laser alignment bench in order to center the laser beam vertically on the dot.) ⑦ Repeat steps 3 through 6 until the laser beam is aligned with the dot for both positions of the component holder. The Component Holders Each optics system includes several of the standard component holders that attach magnetically to the optics bench, as in Figure 7. Components mount magnetically onto either side of the component holders. For proper alignment of the components along the optical axis of the bench: ①Mount the component holder flush against the alignment rail of the bench, as in Figure 7