Portable Uploadable Problem Set 3
For Questions 2,3,4 &5 Please refer to Brainware 7
Question 1:
For design of bearings, rails and actuator, please refer Brainware 7
Slider and Actuator Preload:
Lead Screw Life and Loads:
The NEMA 17 motor has a rated power of 4.2W and a rated torque of 0.45Nm. Using the Leadscrew Design spreadsheet, I was surprised to see that my linear speed is only 3mm/s for the 2mm lead that I calculated earlier. My original prediction using velocity = Motor Power/ Load yielded 10mm/s. The losses due to thrust bearing as well as inefficiencies in raising and lowering the table are extremely important! I increased my lead to 4mm as was able to achieve a linear speed of 5mm/s for the NEMA 17 motor. However the required torque is marginally higher than the torque of the motor.
