branikita (Nikita Bragin)

reacted to their post with 🚀 5 days ago

Post

1223

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!

posted an update 5 days ago

Post

1223

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!

reacted to their post with 🚀 8 days ago

Post

3257

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.

posted an update 8 days ago

Post

3257

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.

reacted to their post with 🔥 9 days ago

Post

2119

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.

posted an update 9 days ago

Post

2119

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.

reacted to their post with 🚀 18 days ago

Post

2915

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?

posted an update 18 days ago

Post

2915

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?

reacted to their post with 🚀 19 days ago

Post

2295

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

posted an update 19 days ago

Post

2295

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

reacted to their post with 👍 20 days ago

Post

2255

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

posted an update 20 days ago

Post

2255

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

reacted to their post with 👀 26 days ago

Post

1248

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.

posted an update 26 days ago

Post

1248

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.

reacted to their post with 🚀 29 days ago

Post

2886

With

Robonine team we recently verified the rotational speed of the Feetech STS3250 servo motor (12 V, 50 kg·cm torque, magnetic encoder) to compare measured performance with the official specification.

According to the datasheet:
- Rated speed: 0.133 s per 60°

Calculation:
- 0.133 s × 6 = 0.798 s per full rotation
- 1 / 0.798 = 1.253 revolutions per second
- 1.253 × 60 = 75.2 RPM

This confirms the official specification of approximately 75 RPM at 12 V under no load.

Our measurement:
- Encoder output: 5,300 values per second
- Encoder resolution: 4,096 counts per revolution

Calculation:
- Revolutions per second = 5,300 ÷ 4,096 = 1.294 rev/s
- RPM = 1.294 × 60 = 77.6 RPM

Result:
The measured value differs by only about 2–3% from the datasheet specification, confirming that the STS3250 performs very close to its rated no-load speed. This close agreement validates both the servo’s performance and our measurement approach.

Video: https://youtube.com/shorts/_O_mVZvYQlQ?feature=share

#servo #robotics #automation #motioncontrol #mechatronics #Feetech #STS3250 #engineering #datasheet #precision #hardwaretesting #roboticsengineering

posted an update 29 days ago

Post

2886

With

Robonine team we recently verified the rotational speed of the Feetech STS3250 servo motor (12 V, 50 kg·cm torque, magnetic encoder) to compare measured performance with the official specification.

According to the datasheet:
- Rated speed: 0.133 s per 60°

Calculation:
- 0.133 s × 6 = 0.798 s per full rotation
- 1 / 0.798 = 1.253 revolutions per second
- 1.253 × 60 = 75.2 RPM

This confirms the official specification of approximately 75 RPM at 12 V under no load.

Our measurement:
- Encoder output: 5,300 values per second
- Encoder resolution: 4,096 counts per revolution

Calculation:
- Revolutions per second = 5,300 ÷ 4,096 = 1.294 rev/s
- RPM = 1.294 × 60 = 77.6 RPM

Result:
The measured value differs by only about 2–3% from the datasheet specification, confirming that the STS3250 performs very close to its rated no-load speed. This close agreement validates both the servo’s performance and our measurement approach.

Video: https://youtube.com/shorts/_O_mVZvYQlQ?feature=share

#servo #robotics #automation #motioncontrol #mechatronics #Feetech #STS3250 #engineering #datasheet #precision #hardwaretesting #roboticsengineering

reacted to their post with 🔥 about 1 month ago

Post

793

Robonine team created a HEX mesh and started analyzing our 6DOF robotic arm model's stiffness. Our goal is to achieve a maximum displacement of 0.3 mm under full load!

posted an update about 1 month ago

Post

793

Robonine team created a HEX mesh and started analyzing our 6DOF robotic arm model's stiffness. Our goal is to achieve a maximum displacement of 0.3 mm under full load!

reacted to their post with 🚀 about 1 month ago

Post

2463

We’re preparing an in-depth review of the Feetech STS-3250 servo motor — exploring its performance, features. One of the top serial bus servo for hobby robotics compatible with SO-ARM 100 manipulator.

1 reply

·

posted an update about 1 month ago

Post

2463

We’re preparing an in-depth review of the Feetech STS-3250 servo motor — exploring its performance, features. One of the top serial bus servo for hobby robotics compatible with SO-ARM 100 manipulator.

1 reply

·

Nikita Bragin

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Nikita Bragin

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