Hi so I came across this gearmotor: Nema 17 Stepper Motor Bipolar w/ 51:1 Planetary Gearbox - RobotShop
but the backlash doesn’t seem to be on there, I am wondering what would be the number for that? Also what would be the weight for this item? These are important for the robot arm I am making
Thanks
1 Like
HI @zhangzk
You can find the backlash info under “Gearbox Specifications” and the total weight under “Physical Specifications”:
Electrical Specification
- Manufacturer Part Number: 17HS19-1684S-PG51
- Motor Type: Bipolar Stepper
- Step Angle: 0.035 deg
- Holding Torque without Gearbox: 52Ncm(73.6oz.in)
- Rated Current/phase: 1.68A
- Phase Resistance: 1.8ohms
- Voltage: 2.8V
- Inductance: 3.2mH ± 20%(1KHz)
Gearbox Specifications
- Gearbox Type: Planetary
- Gear Ratio: 50.9: 1
- Efficiency: 73%
- Backlash at No-load: <=1 deg
- Max.Permissible Torque: 4Nm(566oz.in)
- Moment Permissible Torque: 6Nm(850oz.in)
- Shaft Maximum Axial Load: 50N
- Shaft Maximum Radial Load: 100N
Physical Specifications
- Frame Size: 42 x 42mm
- Motor Length: 48mm
- Gearbox Length: 42.7mm
- Shaft Diameter: Φ8mm
- Shaft Length: 20mm
- D-cut Length: 15mm
- Number of Leads: 4
- Lead Length: 500mm
- Weight: 620g
1 Like