3DoF Leg Assembly Instructions v2.0

Last modified by Eric Nantel on 2026/04/02 16:14

3 DOF A Leg Assembly Instructions v2.0

Updated August 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 or plastic.

Important! You need to build a right leg for every left leg by mirroring these instructions!

3 DOF A Leg — Assembly
Step 1 / 9

Attach a ball bearing to the Multi-Purpose bracket as shown. See the figure below for detailed information.

Ball bearing assembly diagram
Figure 1-2.
3 DOF A Leg — Assembly
Step 2 / 9

Attach the Multi-Purpose bracket from step 1 to another Multi-Purpose bracket as shown, using two 2-56 x .250 screws and 2-56 nuts.

2x
2-56 x .250" Phillips screw
2x
2-56 nut
Figure 2.
3 DOF A Leg — Assembly
Step 3 / 9

Attach two "C" brackets together, using two 2-56 x .250 screws and 2-56 nuts.

2x
2-56 x .250" Phillips screw
2x
2-56 nut
Figure 3.
3 DOF A Leg — Assembly
Step 4 / 9

Attach the "C" bracket to the Multi-Purpose bracket from step 2 as shown. See the figure below for detailed information.

Bracket assembly diagram
Figure 4-2.
3 DOF A Leg — Assembly
Step 5 / 9

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

2x
2-56 x .250" Phillips screw
2x
2-56 nut
Figure 5.
3 DOF A Leg — Assembly
Step 6 / 9

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.

2x
2-56 x .250" Phillips screw
2x
2-56 nut
Figure 6.
3 DOF A Leg — Assembly
Step 7 / 9

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

Bracket assembly diagram
Figure 7-2.
3 DOF A Leg — Assembly
Step 8 / 9

Install the servos as shown, using the included 3mm hardware and #2 tapping screws.

4x
#2 x .250" tapping screw
12x
3mm servo hardware set
Figure 8.
3 DOF A Leg — Assembly
Step 9 / 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.

Be sure to mirror the other leg for symmetry. Once complete, you can move on to the body assembly instructions.

1x
4-40 x .250" socket head screw
Figure 9-2.
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Created by Eric Nantel on 2024/07/03 09:20

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