Web Site: www.parallax.com Office: (916) 624-8333 Forums: forums.parallax.com Fax: (916) 624-8003 Sales: sales parallax.com Sales: (888) 512-1024 Technical: support parallax.com Tech Support: (888) 997-8267 Boe-Bot Tank Treads ( 28106) Treaded Addition for the Boe-Bot Robot Introduction Treads let the Boe-Bot access more varied terrain such as carpet, small rocks or imperfect surfaces. This kit involves the removal of the Boe-Bot wheels and addition of a treaded drive train. Packing List Part Description Qty 700-00002 4-40 Machine Screw, 3/8 6 700-00003 4-40 Nut 700-00003 22 700-00007 8 4-40 Machine Screw, 7/8 700-00028 4-40 Machine Screw, 1/4 8 700-00059 4 Lock Washer 8 710-00008 2 1.5 Screw 713-00003 1.25 Standoff 2 720-28106 Metal Sides 2 721-28106 Plastic Wheel and Rubber Tread set 1 725-00013 Servo Horns may be standard or round disc 2 Tools Needed You will need a 2 Philips screwdriver, wrench, and a 3/32 drill (or hobby knife like an X-acto knife). Assembly Step 1: From the set of wheels, cut out the following and trim off any burrs: (2) large wheels (with teeth) (2) large wheels (no teeth) (6) medium-sized wheels (no teeth) The remaining wheels are not used for this application. However, the wheels with sprockets can be modified and used if there is a tread alignment problem for details refer to the Troubleshooting the Tread section on page 4. Copyright Parallax Inc. Product Name ( 28106) v2.1 5/5/2009 Page 1 of 4 continuousrotation www.parallax.com Step 2: The servo horn will need four of the holes enlarged for the 4-40 screws. The holes need to be smaller than the screw so that when the screws are inserted they will make their own threads. You can drill the holes using a 3/32 drill bit, or use an X-acto knife to enlarge the holes as shown below, depending on which servo horns were included in your kit. If you are using the knife, be sure not to over-enlarge the holes. By reaming with the knife a little from both the top and bottom, the hole will be more uniform in size. 3/32 (2.2 mm) 3/32 (2.2 mm) Enlarge the Middle Holes Enlarge Inner Holes if using Disc Servo Horns if using Standard Servo Horns Step 3: Using the Step 4: Attach the 7/8 length screws and nuts to length screws, attach the remaining wheels (2 large and 6 medium in size) the two large wheels as shown below, and set aside. (with teeth) to the servo horns. Step 5: Remove the wheels from your Boe-Bot. The servos should be mounted with the head toward the rear ball wheel as in Figure 5. The servo mounting tabs need to be on the outside of the Boe-Bot chassis. Confirm that the servos are mounted correctly. If your servos are mounted the opposite way, or are mounted from inside the chassis, remove them and remount as shown. Wrong Way Right Way Servo head is mounted Servo mounting tabs are toward tail wheel outside of chassis Copyright Parallax Inc. Product Name ( 28106) v2.1 5/5/2009 Page 2 of 4 continuous rotation www.parallax.com