T-Hex 4DoF Leg Assembly Instructions

Last modified by Eric Nantel on 2026/04/02 17:08

4 DOF T-HEX Leg Assembly Instructions

Updated November 11, 2010

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

Important! If you are building legs for the T-HEX robot, you will need to build three right legs (following the pictures on the right) and three left legs (by following the pictures on the left)!

4 DOF T-HEX Leg — Assembly (All Legs)
Step 1 / 16

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

12x
2-56 x .250" Phillips screw
12x
2-56 nut
Figure 1. (Left Leg)
Figure 1. (Right Leg)
4 DOF T-HEX Leg — Assembly (All Legs)
Step 2 / 16

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. Make three of each.

12x
2-56 x .250" Phillips screw
12x
2-56 nut
Figure 2. (Left Leg)
Figure 2. (Right Leg)
4 DOF T-HEX Leg — Assembly (All Legs)
Step 3 / 16

Connect a 1.5" tube to each hub using a 4-40 x .250" screw.

6x
4-40 x .250" socket head screw
Figure 3. (Left Leg)
Figure 3. (Right Leg)
4 DOF T-HEX Leg — Assembly (All Legs)
Step 4 / 16

Attach an offset "C" bracket to an "L" bracket as shown, using two 2-56 x .250 screws and 2-56 nuts. Create six of these.

12x
2-56 x .250" Phillips screw
12x
2-56 nut
Figure 4. (Left Leg)
Figure 4. (Right Leg)
4 DOF T-HEX Leg — Assembly (All Legs)
Step 5 / 16

Attach the other side of the six "L" connector brackets to a Multi-Purpose bracket as shown, using two 2-56 x .250 screws and 2-56 nuts. Make three for each side.

12x
2-56 x .250" Phillips screw
12x
2-56 nut
Figure 5. (Left Leg)
Figure 5. (Right Leg)
4 DOF T-HEX Leg — Assembly (All Legs)
Step 6 / 16

Attach the offset "C" bracket to the Multi-Purpose bracket as shown. See the diagram below for detailed information. You should have three of each of these assemblies at the end of this step.

—
Bracket assembly diagram
Figure 6. (Left Leg)
Figure 6. (Right Leg)
4 DOF T-HEX Leg — Assembly (All Legs)
Step 7 / 16

Connect a long "C" bracket and an offset "C" bracket as shown, using two 2-56 x .250 screws and 2-56 nuts. Create six of these.

12x
2-56 x .250" Phillips screw
12x
2-56 nut
Figure 7. (Left Leg)
Figure 7. (Right Leg)
4 DOF T-HEX Leg — Assembly (All Legs)
Step 8 / 16

Attach the "C" bracket to the Multi-Purpose bracket as shown. See the diagram below for detailed information. Make three of each.

—
Bracket assembly diagram
Figure 8. (Left Leg)
Figure 8. (Right Leg)
4 DOF T-HEX Leg — Assembly (All Legs)
Step 9 / 16

Attach a ball bearing to the Multi-Purpose bracket as shown. See the diagram below for detailed information. Make three of each.

—
Ball bearing assembly diagram
Figure 9. (Left Leg)
Figure 9. (Right Leg)
4 DOF T-HEX Leg — Assembly (Front & Middle Legs)
Step 10 / 16

Attach two multi-purpose brackets as shown, using two 2-56 x .250" screws and 2-56 nuts. Make two for each side.

8x
2-56 x .250" Phillips screw
8x
2-56 nut
Figure 10. (Left Leg)
Figure 10. (Right Leg)
4 DOF T-HEX Leg — Assembly (Front & Middle Legs)
Step 11 / 16

Attach the "C" bracket to the Multi-Purpose bracket as shown. See the diagram below for detailed information. Create two of each.

—
Bracket assembly diagram
Figure 11. (Left Leg)
Figure 11. (Right Leg)
4 DOF T-HEX Leg — Assembly (Front & Middle Legs)
Step 12 / 16

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

24x
#2 x .250" tapping screw
64x
3mm servo hardware set
Figure 12. (Left Leg)
Figure 12. (Right Leg)
4 DOF T-HEX Leg — Assembly (Rear Legs)
Step 13 / 16

Attach the two multi-purpose brackets as shown, using two 2-56 x .250" screws and 2-56 nuts. Make one for each side.

4x
2-56 x .250" Phillips screw
4x
2-56 nut
Figure 13. (Left Leg)
Figure 13. (Right Leg)
4 DOF T-HEX Leg — Assembly (Rear Legs)
Step 14 / 16

Attach the "C" brackets to the Multi-Purpose bracket as shown. See the diagram below for detailed information.

—
Bracket assembly diagram
Figure 14. (Left Leg)
Figure 14. (Right Leg)
4 DOF T-HEX Leg — Assembly (Rear Legs)
Step 15 / 16

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

12x
#2 x .250" tapping screw
32x
3mm servo hardware set
Figure 15. (Left Leg)
Figure 15. (Right Leg)
4 DOF T-HEX Leg — Assembly Complete! (All Legs)
Step 16 / 16

Slide a rubber foot over the end of each 1.5" tube, and you're finished!

Figure 16. (Left Leg)
Figure 16. (Right Leg)
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Created by Eric Nantel on 2024/07/03 09:20
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