Post
2125
Next week, we will release full documentation for the SO ARM 101 with a parallel gripper, featuring leader and follower arms and support for widely used stereo cameras.
Nikita Bragin PRO
branikita
AI & ML interests
Founder of Robonine. Robotics for research and education
Recent Activity
Organizations
reacted to
their
post with 🚀
12 days ago
posted
an
update
12 days ago
Post
2125
Next week, we will release full documentation for the SO ARM 101 with a parallel gripper, featuring leader and follower arms and support for widely used stereo cameras.
replied to
their
post
12 days ago
Thank you for your comment, William. I will defenetly publish all updates here.
reacted to
their
post with 🚀
13 days ago
Post
2063
Update: Our engineer Alan has received a batch of components for the manipulator assemblies — including clamps and metal bracket parts. Prototype assembly is planned for the beginning of next year.
-
- 2 replies
posted
an
update
13 days ago
Post
2063
Update: Our engineer Alan has received a batch of components for the manipulator assemblies — including clamps and metal bracket parts. Prototype assembly is planned for the beginning of next year.
-
-
- 2 replies
reacted to
their
post with 🚀
28 days ago
Post
1870
We've published a comprehensive evaluation of the Feetech STS3250 servo actuator.
Key Findings:
- Speed: 77.6 RPM (exceeds spec by 3.2%)
- Backlash: 0.43° (within 0.5° limit)
- Repeatability: ±0.02mm at 95mm radius
- Peak torque: 48 kg·cm
- Sustained torque: ~25 kg·cm after thermal protection
Full review: https://robonine.com/feetech-sts3250-smart-actuator-evaluation-of-accuracy-torque-and-backlash/
Key Findings:
- Speed: 77.6 RPM (exceeds spec by 3.2%)
- Backlash: 0.43° (within 0.5° limit)
- Repeatability: ±0.02mm at 95mm radius
- Peak torque: 48 kg·cm
- Sustained torque: ~25 kg·cm after thermal protection
Full review: https://robonine.com/feetech-sts3250-smart-actuator-evaluation-of-accuracy-torque-and-backlash/
- 1 reply
posted
an
update
28 days ago
Post
1870
We've published a comprehensive evaluation of the Feetech STS3250 servo actuator.
Key Findings:
- Speed: 77.6 RPM (exceeds spec by 3.2%)
- Backlash: 0.43° (within 0.5° limit)
- Repeatability: ±0.02mm at 95mm radius
- Peak torque: 48 kg·cm
- Sustained torque: ~25 kg·cm after thermal protection
Full review: https://robonine.com/feetech-sts3250-smart-actuator-evaluation-of-accuracy-torque-and-backlash/
Key Findings:
- Speed: 77.6 RPM (exceeds spec by 3.2%)
- Backlash: 0.43° (within 0.5° limit)
- Repeatability: ±0.02mm at 95mm radius
- Peak torque: 48 kg·cm
- Sustained torque: ~25 kg·cm after thermal protection
Full review: https://robonine.com/feetech-sts3250-smart-actuator-evaluation-of-accuracy-torque-and-backlash/
-
- 1 reply
reacted to
their
post with 🚀
about 1 month ago
Post
1270
Publishing our research on dual-motor backlash compensation for STS3215 servos. To complete our arXiv submission, we need a quick endorsement from someone who has published in robotics (cs.RO/eess.SY).
If you can help, here’s the code: L64QM3
Thank you!
If you can help, here’s the code: L64QM3
Thank you!
posted
an
update
about 1 month ago
Post
1270
Publishing our research on dual-motor backlash compensation for STS3215 servos. To complete our arXiv submission, we need a quick endorsement from someone who has published in robotics (cs.RO/eess.SY).
If you can help, here’s the code: L64QM3
Thank you!
If you can help, here’s the code: L64QM3
Thank you!
reacted to
their
post with 🚀
about 1 month ago
Post
3274
Proud to share the results of our engineering team’s recent work at
Robonine
:
• Together, we applied advanced topology optimization to redesign critical brackets of the manipulator, achieving a 57–76% reduction in structural deflection.
• Our updated model also demonstrated a major stress decrease — from 93 MPa down to 25 MPa — all while staying within the allowed weight increase.
• Although we didn’t fully reach the target tip deviation of 0.3 mm (best achieved: 0.41 mm), the project gave us valuable insights and a solid foundation for the next design iteration.
• Together, we applied advanced topology optimization to redesign critical brackets of the manipulator, achieving a 57–76% reduction in structural deflection.
• Our updated model also demonstrated a major stress decrease — from 93 MPa down to 25 MPa — all while staying within the allowed weight increase.
• Although we didn’t fully reach the target tip deviation of 0.3 mm (best achieved: 0.41 mm), the project gave us valuable insights and a solid foundation for the next design iteration.
posted
an
update
about 1 month ago
Post
3274
Proud to share the results of our engineering team’s recent work at
Robonine
:
• Together, we applied advanced topology optimization to redesign critical brackets of the manipulator, achieving a 57–76% reduction in structural deflection.
• Our updated model also demonstrated a major stress decrease — from 93 MPa down to 25 MPa — all while staying within the allowed weight increase.
• Although we didn’t fully reach the target tip deviation of 0.3 mm (best achieved: 0.41 mm), the project gave us valuable insights and a solid foundation for the next design iteration.
• Together, we applied advanced topology optimization to redesign critical brackets of the manipulator, achieving a 57–76% reduction in structural deflection.
• Our updated model also demonstrated a major stress decrease — from 93 MPa down to 25 MPa — all while staying within the allowed weight increase.
• Although we didn’t fully reach the target tip deviation of 0.3 mm (best achieved: 0.41 mm), the project gave us valuable insights and a solid foundation for the next design iteration.
reacted to
their
post with 🔥
about 1 month ago
Post
2133
We tested the mechanical backlash of the Feetech STS3250 servo.
Using an 86 mm lever arm, we measured a tip displacement of 0.64 mm, which corresponds to an angular backlash of approximately 0.43°.
According to the datasheet, the maximum allowable backlash is 0.5°, so our measured value of 0.43° falls within the specified limit.
Using an 86 mm lever arm, we measured a tip displacement of 0.64 mm, which corresponds to an angular backlash of approximately 0.43°.
According to the datasheet, the maximum allowable backlash is 0.5°, so our measured value of 0.43° falls within the specified limit.
posted
an
update
about 1 month ago
Post
2133
We tested the mechanical backlash of the Feetech STS3250 servo.
Using an 86 mm lever arm, we measured a tip displacement of 0.64 mm, which corresponds to an angular backlash of approximately 0.43°.
According to the datasheet, the maximum allowable backlash is 0.5°, so our measured value of 0.43° falls within the specified limit.
Using an 86 mm lever arm, we measured a tip displacement of 0.64 mm, which corresponds to an angular backlash of approximately 0.43°.
According to the datasheet, the maximum allowable backlash is 0.5°, so our measured value of 0.43° falls within the specified limit.
reacted to
their
post with 🚀
about 2 months ago
Post
2922
In November, with
Robonine
are starting work on the next version of the SO ARM 102 manipulator. The version will be open source and agreed upon with
@therobotbuilder
the creator of the original manipulator.
We are planning to:
- increase positioning accuracy by approximately 2x using Feetech STS 3250 motors
- increase working payload from 200g to 300g
- increase rigidity using parametric design optimization and stiffer plastic
- increase length to 550 mm
- increase folding angles
- use ISO 9409-1-50-4-M6 mounting standard for the gripper
- use a parallel gripper in the default version
- update the mounting plate for different camera types, M3 grid with 12.5 mm pitch
- add table mounting standard 80x80 M8
The number of degrees of freedom and basic kinematics will remain the same.
Are there other things missing for working with SO ARM 100?
- Any standard inputs/outputs, for example?
- Status indicators?
- Perhaps some types of mounting for third-party grippers are more preferable?
- Anything else?
We are planning to:
- increase positioning accuracy by approximately 2x using Feetech STS 3250 motors
- increase working payload from 200g to 300g
- increase rigidity using parametric design optimization and stiffer plastic
- increase length to 550 mm
- increase folding angles
- use ISO 9409-1-50-4-M6 mounting standard for the gripper
- use a parallel gripper in the default version
- update the mounting plate for different camera types, M3 grid with 12.5 mm pitch
- add table mounting standard 80x80 M8
The number of degrees of freedom and basic kinematics will remain the same.
Are there other things missing for working with SO ARM 100?
- Any standard inputs/outputs, for example?
- Status indicators?
- Perhaps some types of mounting for third-party grippers are more preferable?
- Anything else?
posted
an
update
about 2 months ago
Post
2922
In November, with
Robonine
are starting work on the next version of the SO ARM 102 manipulator. The version will be open source and agreed upon with
@therobotbuilder
the creator of the original manipulator.
We are planning to:
- increase positioning accuracy by approximately 2x using Feetech STS 3250 motors
- increase working payload from 200g to 300g
- increase rigidity using parametric design optimization and stiffer plastic
- increase length to 550 mm
- increase folding angles
- use ISO 9409-1-50-4-M6 mounting standard for the gripper
- use a parallel gripper in the default version
- update the mounting plate for different camera types, M3 grid with 12.5 mm pitch
- add table mounting standard 80x80 M8
The number of degrees of freedom and basic kinematics will remain the same.
Are there other things missing for working with SO ARM 100?
- Any standard inputs/outputs, for example?
- Status indicators?
- Perhaps some types of mounting for third-party grippers are more preferable?
- Anything else?
We are planning to:
- increase positioning accuracy by approximately 2x using Feetech STS 3250 motors
- increase working payload from 200g to 300g
- increase rigidity using parametric design optimization and stiffer plastic
- increase length to 550 mm
- increase folding angles
- use ISO 9409-1-50-4-M6 mounting standard for the gripper
- use a parallel gripper in the default version
- update the mounting plate for different camera types, M3 grid with 12.5 mm pitch
- add table mounting standard 80x80 M8
The number of degrees of freedom and basic kinematics will remain the same.
Are there other things missing for working with SO ARM 100?
- Any standard inputs/outputs, for example?
- Status indicators?
- Perhaps some types of mounting for third-party grippers are more preferable?
- Anything else?
reacted to
their
post with 🚀
about 2 months ago
Post
2302
FEETECH STS3250 Stall Torque and Repeatability Tests
We recently tested the FEETECH STS3250 servo, comparing actual performance with the official specifications. While the datasheet lists a stall torque of 50 kg·cm at 12 V, our real-world measurements showed:
- 25 kg·cm sustained torque after protection activation
- Up to 48 kg·cm peak torque for a split second
Although the built-in protection limits continuous stall torque, the servo demonstrated excellent stability and control precision.
Precision and Repeatability:
- Repeatability tolerance: ±0.02 mm at the end of a 95 mm arm
- Smooth motion response with PID control and 12-bit (4096-step) magnetic encoder
- Reliable performance for high-accuracy robotics and automation applications
#Feetech #STS3250 #ServoTest #Robotics #Engineering #PrecisionControl #HardwareReview
We recently tested the FEETECH STS3250 servo, comparing actual performance with the official specifications. While the datasheet lists a stall torque of 50 kg·cm at 12 V, our real-world measurements showed:
- 25 kg·cm sustained torque after protection activation
- Up to 48 kg·cm peak torque for a split second
Although the built-in protection limits continuous stall torque, the servo demonstrated excellent stability and control precision.
Precision and Repeatability:
- Repeatability tolerance: ±0.02 mm at the end of a 95 mm arm
- Smooth motion response with PID control and 12-bit (4096-step) magnetic encoder
- Reliable performance for high-accuracy robotics and automation applications
#Feetech #STS3250 #ServoTest #Robotics #Engineering #PrecisionControl #HardwareReview
posted
an
update
about 2 months ago
Post
2302
FEETECH STS3250 Stall Torque and Repeatability Tests
We recently tested the FEETECH STS3250 servo, comparing actual performance with the official specifications. While the datasheet lists a stall torque of 50 kg·cm at 12 V, our real-world measurements showed:
- 25 kg·cm sustained torque after protection activation
- Up to 48 kg·cm peak torque for a split second
Although the built-in protection limits continuous stall torque, the servo demonstrated excellent stability and control precision.
Precision and Repeatability:
- Repeatability tolerance: ±0.02 mm at the end of a 95 mm arm
- Smooth motion response with PID control and 12-bit (4096-step) magnetic encoder
- Reliable performance for high-accuracy robotics and automation applications
#Feetech #STS3250 #ServoTest #Robotics #Engineering #PrecisionControl #HardwareReview
We recently tested the FEETECH STS3250 servo, comparing actual performance with the official specifications. While the datasheet lists a stall torque of 50 kg·cm at 12 V, our real-world measurements showed:
- 25 kg·cm sustained torque after protection activation
- Up to 48 kg·cm peak torque for a split second
Although the built-in protection limits continuous stall torque, the servo demonstrated excellent stability and control precision.
Precision and Repeatability:
- Repeatability tolerance: ±0.02 mm at the end of a 95 mm arm
- Smooth motion response with PID control and 12-bit (4096-step) magnetic encoder
- Reliable performance for high-accuracy robotics and automation applications
#Feetech #STS3250 #ServoTest #Robotics #Engineering #PrecisionControl #HardwareReview
reacted to
their
post with 👍
about 2 months ago
Post
2262
Load test conducted on the Feetech STS3250 servo motor.
With a 2 kg load on a 100 mm arm, the motor operated near its limit. At higher acceleration settings, lifting performance decreased noticeably. The temperature increased from 40 °C to 70 °C within 8 minutes.
The test highlights the torque and thermal constraints under sustained load conditions.
#Robotics #Engineering #ServoMotor #Testing #Feetech #Automation #Mechatronics #Hardware
With a 2 kg load on a 100 mm arm, the motor operated near its limit. At higher acceleration settings, lifting performance decreased noticeably. The temperature increased from 40 °C to 70 °C within 8 minutes.
The test highlights the torque and thermal constraints under sustained load conditions.
#Robotics #Engineering #ServoMotor #Testing #Feetech #Automation #Mechatronics #Hardware
posted
an
update
about 2 months ago
Post
2262
Load test conducted on the Feetech STS3250 servo motor.
With a 2 kg load on a 100 mm arm, the motor operated near its limit. At higher acceleration settings, lifting performance decreased noticeably. The temperature increased from 40 °C to 70 °C within 8 minutes.
The test highlights the torque and thermal constraints under sustained load conditions.
#Robotics #Engineering #ServoMotor #Testing #Feetech #Automation #Mechatronics #Hardware
With a 2 kg load on a 100 mm arm, the motor operated near its limit. At higher acceleration settings, lifting performance decreased noticeably. The temperature increased from 40 °C to 70 °C within 8 minutes.
The test highlights the torque and thermal constraints under sustained load conditions.
#Robotics #Engineering #ServoMotor #Testing #Feetech #Automation #Mechatronics #Hardware
reacted to
their
post with 👀
2 months ago
Post
1253
At
Robonine
, we applied topology optimization to enhance the stiffness and efficiency of a robotic manipulator. Using HyperMesh with the OptiStruct solver, we defined the design space where each element had a pseudo-density coefficient (0–1) controlling stiffness. This allowed the algorithm to continuously redistribute material toward regions with higher strain energy — much like how a fluid naturally flows to balance pressure.
Results:
- Aluminum bracket: displacement reduced by 0.16 mm
- Steel bracket: displacement reduced from 1.05 mm → 0.63 mm
- Steel clamp: displacement reduced by 0.14 mm
- Final structure: optimized geometry with improved load distribution and reduced deformation
This project highlights how advanced structural optimization can significantly improve performance while minimizing material usage — shaping the next generation of robotic design.
Results:
- Aluminum bracket: displacement reduced by 0.16 mm
- Steel bracket: displacement reduced from 1.05 mm → 0.63 mm
- Steel clamp: displacement reduced by 0.14 mm
- Final structure: optimized geometry with improved load distribution and reduced deformation
This project highlights how advanced structural optimization can significantly improve performance while minimizing material usage — shaping the next generation of robotic design.