Hands On Physics

Haze
Core Project
Installing the Hardware

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Overview.

Installing the Hardware

Figure C4

Sun Photometer

1. Use four 4-40 screws and hex nuts to mount the solderless breadboard inside the case as shown above in Fig. C4. (Two different sizes of screws and hex nuts are used. The 6-32 screws are thicker than the 4-40 screws.)
   
   
2. The rows and columns of holes in the breadboard are numbered. Align the breadboard so that column number 1 is closest to the rigid side of the case. Insert the screws through the bottom side of the case. Tighten the screws and hex nuts with a screw driver and pliers.
   
   
   1. Use a file to remove 1 mm from the end of an angle bracket. Mark the filed end with a colored marker or pencil.
      
      
   2. Place the angle bracket in front of the breadboard as shown in Fig. C4. Adjust the bracket until it is 2.25 cm from the inside of the rigid side of the case. The holes in the bracket will then be aligned with columns 2 and 3 of the breadboard.
      
      
   3. With the bracket pushed flush against the breadboard, mark a drill guide in the bottom of the VHS case at the center of the hole in the bracket.
      
      
   4. Use a 5/32-inch bit or its metric equivalent to drill a hole at the drill guide you just marked. Hold the case firmly while drilling. Carefully use a hobby knife to remove any plastic attached to the edge of the hole.
      
      
   5. Insert a 6-32 screw through the back side of the case and the hole in the unfiled end of the angle bracket. Place a 6-32 hex nut over the screw.
      
      
   6. Make sure the filed end of the angle bracket faces up. Then press the bracket flush against the breadboard and tighten the screw and nut with a screw driver and pliers.
      
      
   7. Refer to Fig. C2 and measure the exact distance of the center of the upper hole in the angle bracket from the inside of the rigid side of the case (2.25 mm in the prototype) and the bottom of the case (1.7 cm). Then mark a drill guide in the front of the case that exactly matches these dimensions.
      
      
   8. Double check the drill guide you just marked to make sure it is centered directly over the hole in the angle bracket installed inside the case. Then use a 9/32-inch bit to drill a hole at the drill guide. If you don't have this drill bit, drill a smaller hole and carefully enlarge it with a reamer or hobby knife.
      
      
   9. Install the two 9-volt battery clips on the inside of the flexible side of the case using 6-32 screws and hex nuts at the locations shown in Fig. C4. Be sure to insert the screws through the battery holders and then through the inside of the flexible side of the case. Tighten the screws and hex nuts with a screw driver and pliers.
      
      
   10. Install two angle brackets on the outside of the case using 6-32 screws and hex nuts. Orient the brackets as shown in Fig. C3. Be sure the edges of these brackets are flush with the shoulder that protrudes along the bottom edge of the case as shown in Fig. C3. (If one or both brackets are not flush, enlarge the hole slightly so the bracket can be pushed against the shoulder.) Make sure the lid of the VHS case closes properly. Then tighten the screws and hex nuts with a screw driver and pliers.
       
       
   11. Remove the hex nuts and lock washers from the two binding posts. Insert the threaded ends of each binding post into the holes shown in Fig. C4. Install the black binding post nearest the end of the case. Replace the locking washers and hex nuts and tighten with pliers.
       
       
   12. Place the solderless breadboard over its mounting holes so that the row of holes designated 1 is next to the rigid side of the case. Insert four 4-40 screws through the back of the case and hold them in place with 4-40 hex nuts. Tighten the screws and hex nuts with a screw driver and pliers.