Sixi 2 robot arm
2. Picasso Box Assembly
Step 1 Tools and Parts Required for This Chapter
Step 2 Hand Gearbox - Input Shaft & Rotor Parts
- Note:
Prepare the following components:
[3D] - 6Da Hand GB Rotors
[3D] - 6Da Hand GB Eccentric Cams
[3D] - 6Db Hand GB Bevel Gear
Brass Tube [5/16' x 19.5mm]
6701 Bearing [12x18x4mm] (x4)
M3x4mm SetScrew (x3)
- Note:
Rotors are Labelled "T" and "B" for Top and Bottom according to Eccentric Cams' Top and Bottom, Thick Piece = Bottom and Thin Piece = Top
Step 3 Hand Gearbox - Input Shaft 1
Step 4 Hand Gearbox - Input Shaft 2
Step 5 Hand Gearbox - Rotors
Step 6 Hand Gearbox - Input Shaft & Rotor
Align the Thick Eccentric Cam {Bottom} and use the M3 Set Screw to secure its location
- Warning:
Make sure the Set Screw goes in just enough for the bearing to slide over NO MORE!!
Place the "B" Rotor onto the eccentric cam with the "B" label facing the Bevel Gear
Repeat with the Thin Eccentric Cam {Top} and "T" Rotor with "T" label facing up
Step 7 Hand Gearbox - Output Disks
- Note:
Prepare the following components:
[3D] - 6Da Hand GB Output Disks
Thicker Output Disk is considered "Top"
6706 Bearing [30x37x4mm] (x1)
M3x20mm Screws (x8)
M3 Hex Nuts (x11)
Insert M3 Hex Nuts in the nut inserts of Both Output Disks
Align the 3 middle holes of Top and Bottom Disks. Clamp the 6706 bearing with the Output Disks using M3x20mm Screws
Step 8 Hand Gearbox Housing - Parts
- Note:
Prepare the following components:
[3D] - 6Da Hand GB Housing {Top & Bottom}
[3D] - 6Da Hand GB Magnet Holder
8x2.5mm Neodymium Magnet
M3x35mm Threaded Rod
- Warning:
Since February 2020, this is replaced with Brass Tube [1/8'x35mm]
M3x4mm Set Screws (x2)
M3x20mm Screws (x4)
Step 9 Hand Gearbox Housing - Rotor Alignment
- Warning:
Rotor Alignment is very IMPORTANT! Follow the pictures carefully!
- Note:
Make sure there are sharpie marks on the side of the Rotors where it lines up with "T" and "B" on the rotors
Align the Side Mark of "T" Rotor to the "T" on the Housing, and only insert Top Rotor into the housing.
Align the Side Mark of "B" Rotor to the "B" on the Housing, and insert the Bottom Rotor
When aligned properly all 8 holes made by 2 rotors intersecting should have equal spacing
- Note:
Verify that you can manually turn the eccentric shaft in the center and that the rotors smoothly turn inside the housing. Tight printing and misaligned rotors can cause the gearbox to jam.
Step 10 Hand Gearbox Housing - Top Housing
Insert M3 Set Screw on the side of the Output disk
Insert the Assembled Output Disk pins through the Rotors
Slide in the Top Housing to 6706 Bearings on the Output Disk and align the Top & Main Housings along the alignment markers
Secure its position using M3x20mm Screws. ONLY screw in until it's flushed to the face of the housing
Step 11 Hand Gearbox Sensor Magnet
Insert the Neodymium Magnet in the Hand Sensor Magnet Holder, if you haven't yet.
Insert M3 Threaded Rod in the Magnet Holder. Secure the Rod using the M3 Set Screw
Feed the other end of the Rod to through the Input Shaft Tube all the way to Output Disk
Secure that end with a M3 Set Screw in the Output Disk
Step 12 Side Bevel Gear - Parts
Step 13 Side Bevel Gear
Step 14 Sensor Shaft - Parts
Step 15 Sensor Shaft - Hand Sensor Holder
Step 16 Sensor Shaft - Hand Sensor Cable
Step 17 Picasso Wrist Magnet Holder - Parts
Step 18 Picasso Wrist Magnet Holder
Insert the the cable end of the Brass Tube {Sensor Shaft} through the Assembled Side Bevel Gear
Insert Picasso Magnet Holder on the Brass Tube and align the set screw holes
- Warning:
When aligned properly, "Half Moon Cut" on the Brass Tube should line up with the opening on the Magnet Holder
Secure the Magnet Holder using M3 Set Screw
Push the Magnet Holder into the 6701 Bearing that's in the Pulley Gear
Step 19 Picasso Box Clamp - Parts
Step 20 Picasso Box Clamp - Hand Gearbox
Step 21 Picasso Box Clamp - Side Bevel Gear
Align the 6706 Bearing closer to Bevel Gear to the Picasso bearing insert of 6Aa Picasso
- Warning:
Hand Sensor Chip should be facing the Hand Gearbox
Clamp the 6Ab Picasso and secure it by tightening the M3x20mm Screws on the Hand Gearbox
Use M3 Set Screw to secure the Sensor Shaft to the Picasso Box
Insert M3x45mm Screws on one side and M3 Nuts on the other, to clamp the Picasso Box
Step 22 Gearbox test
Hold the picasso box with one hand and turn the input pulley of the Side Bevel Gearbox with the other.
The input pulley and the hand should turn smoothly at different ratios, with little or no play.
If the gearbox refuses to turn, it is very likely the 3D printed gears are too tight. Now is the time to reprint them before continuing with assembly.


![[3D] - 6Da Hand GB Rotors](images/originals/image-1217.jpg)











![[3D] - 6Da Hand GB Output Disks](images/originals/image-1250.jpg)

































![[LSR] - Acrylic Picasso Cover Plates (x2)](images/originals/image-1330.jpg)




