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Discussion History

Three-Roll Wrist

Assembly

Compact wrist providing pitch, yaw, and roll of the tool. A full specification article for this item is being written. Meanwhile its bill of materials and connections are below.

Three-Roll Wrist parts and their functions

3 top-level parts · 165 parts in total · full bill of materials below
Three-Roll Wrist parts diagram: 1 servo joint, 2 wrist housing, 3 helical gear pair. 165 parts in 3 assemblies.
Three-Roll Wrist parts diagram. Numbers match the table below; each box is one top-level part or assembly with what it contains.
#PartQtyWhat it does
1 Servo Joint 5 parts 3× One rotary axis with motor, reducer, brake, and feedback.
2 Wrist Housing 1×
3 Helical Gear Pair 2× Two meshing helical gears forming one reduction stage that steps torque up and speed down between parallel shafts with quiet, continuous tooth contact.

3D model

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Build & assembly graph

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Bill of materials for Three-Roll Wrist

3 top-level lines · 18 rows shown · 165 parts total · indented to 3 levels
# Item / sub-assembly Part no. Qty/assy Ext. qty Parts Type
1 Servo Joint 5 parts vision-guided-robot-joint 3× 3 54 assembly
1.1 Servo Motor 4 parts servo-motor 1× 3 24 assembly
1.1.1 Stator Assembly 3 parts + deeper › stator-assembly 1× 3 3 assembly
1.1.2 Rotor Assembly 4 parts + deeper › rotor-assembly 1× 3 19 assembly
1.1.3 Encoder encoder 1× 3 · part
1.1.4 Motor Housing motor-housing 1× 3 · part
1.2 RV Reducer 4 parts vision-guided-robot-reducer 1× 3 6 assembly
1.2.1 Gearbox Housing gearbox-housing 1× 3 · part
1.2.2 Cycloidal Disc vision-guided-robot-cycloid-disc 2× 6 · part
1.2.3 Eccentric Cam vision-guided-robot-eccentric-cam 1× 3 · part
1.2.4 Ball Bearing ball-bearing 2× 6 · part
1.3 Holding Brake vision-guided-robot-brake 1× 3 · part
1.4 Absolute Encoder 2 parts vision-guided-robot-encoder 1× 3 21 assembly
1.4.1 Bare PCB pcb-bare 1× 3 · part
1.4.2 SMD Passive (R/C/L) smd-passives 20× 60 · part
1.5 Ball Bearing ball-bearing 2× 6 · part
2 Wrist Housing vision-guided-robot-wrist-housing 1× 1 · part
3 Helical Gear Pair gear-pair 2× 2 · part

Where the three-roll wrist is used

1 product across 1 domain contain it, directly or inside a sub-assembly

Used in 1 assembly

Six-Axis Arm

Sourcing: possible vendors

Prices, MOQ, and lead times are algorithmic estimates, not quotes, and not claims about these companies. Company mappings are curated by keyword; est. price band $0.50–$100. How estimates work
VendorHQSpecialtyMOQLead time
🇨🇳Foxconn
foxconn.com ↗ 		Shenzhen, CN Electronics contract mfg 1,000 pcs 6–10 wks
🇸🇬Flex (Singapore)
flex.com ↗ 		Singapore Electronics contract mfg 1,000 pcs 6–10 wks
🇮🇳Dixon Technologies
dixoninfo.com ↗ 		Noida, IN Electronics contract mfg 1,000 pcs 6–10 wks
🇨🇳BYD Electronics
bydelectronic.com ↗ 		Shenzhen, CN Electronics contract mfg 1,000 pcs 6–10 wks
🇸🇬Venture Corp
venture.com.sg ↗ 		Singapore Electronics contract mfg 1,000 pcs 6–10 wks