3 DOF Leg Assembly Instructions.

Updated 08/30/2007.

Safety first! Wear eye protection and never touch a powered robot!

Note: Do not use Loctite or thread locks on the assembly. They are not necessary and may cause damage to the Lexan.

Important! If you are building legs for the EH3-R using the Bot Board / Basic Atom 28, and SSC-32, then you need to build three right legs and three left legs. This is also true if you are building for a standard insect looking hexapod such as the EH3. However, if you are building for the EH3-R using the ServoPod then you need to make 6 right legs.
Image of completed Right (robot's right) leg.
 
Step 1.
Attach an "L" connector bracket to a Multi-Purpose bracket as shown, using two 2-56 x .250 screws and 2-56 nuts.
 
2 x 2 x

Figure 1.
 
Step 2.
Attach a Multi-Purpose bracket to the "L" bracket as shown, using two 2-56 x .250 screws and 2-56 nuts.
 
2 x 2 x

Figure 2.

Step 3.
Attach the ball bearing that comes with the Long "C" bracket or Lexan chassis to the Multi-Purpose bracket as shown. See the diagram below for detailed information.


Figure 3-1.
Figure 3-2.
 
Step 4.
Attach the "C" bracket to the Multi-Purpose bracket as shown. See the diagram below for detailed information.


Figure 4-1.
Figure 4-2.
 
Step 5.
Attach another "C" bracket to the "C" bracket already there, using two 2-56 x .250 screws and 2-56 nuts.
 
2 x 2 x


Figure 5.

Step 6.
Attach the "C" bracket to a Multi-Purpose bracket as shown, using two ball bearings. See the diagram below for detailed information.


Figure 6-1.


Figure 6-2.
 
Step 7.
Attach a Tubing Connector Hub to an "L" bracket as shown, using two 2-56 x .250 screws and 2-56 nuts.
 
2 x 2 x


Figure 7.
 
Step 8.
Attach the other side of the "L" connector bracket to the Multi-Purpose bracket as shown, using two 2-56 x .250 screws and 2-56 nuts.
 
2 x 2 x

Figure 8.

Step 9.
Connect a 3.0" tube to the hub using a 4-40 x .250" screw. Attach a rubber foot to the end of the tube.
 
1 x  
 

 
Figure 9-2.
 
Step 10.
Install the servos as shown, using the included 3mm hardware, and two #2 tapping screws. Note, for quick prototype assembly, you can use rivet fasteners as shown in the image (sold separately: NSRF-01).
 
2 x 12 x


Figure 10.
 
Step 11.
If the chassis you are building the legs for looks like design "A", then you must remove the round servo horn from the servo, rotate it 90°, and reinstall it onto the servo. If the chassis looks like design "B", then no further action is required.

You can now move on to the body assembly instructions.
Figure 11.