Page 343 - Robot Builder's Bonanza

312 BUILD ROBOTS WITH WHEELS AND TRACKS

In addition to the base material you need:

1 Tamiya Track and Wheel Set (#70100)
2 Tamiya 3-Speed Crank- Axle Gearbox kit (#70093), or equivalent
8 4-40 1″ machine screws
8 4-40 nylon insert locking nuts
18 #4 washers
6 4-40 1/2″ machine screws, nuts
4 3/4″ 1/2″ wide corner angle brackets

Begin by cutting out the base deck and side rail pieces as shown in Figure 26- 17. Refer to
Figure 26- 18 for the drilling details for the two side rails (make two of these). Drill the holes
using a 1/8″ bit. Hole placement is fairly critical, especially the distance between the two
mounting holes for each motor, so use care.
G Note the alternative mounting holes. These holes are for providing a higher tension for the
treads. See the section “Tread Assembly” for more info.

6"

Alternative motor
mounting holes;
adjust for best
tension
5-1/4"
Deck 3"

1-1/8" 3"
1-1/16"
3/8"

5"

1/2" 5/8"
Side rails
(make 2) 1-1/4"

1-1/2" 7/8"
Figure 26- 17 Cutting and drilling guide for the All- Purpose Tracked Robot Base. All holes
are 1/8″.

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