orangeincup said:
τ=4450*(.0005)=2.22 N-m (I assume this is wrong)
billy_joule said:Yes, that method will work for the torque loss.
Where did 0.0005 come from?
You don't need T=Fr to solve this.
Do you know how to calc. the velocity of the load? via the velocity ratio of a screw thread?
Once you know how fast the load is being lifted you calc. the power required (via P=Fv) then finally the torque.
billy_joule said:Do it step by step:
Calc velocity of the load.
calc power required to lift the load at that velocity.
calc torque required (and account for losses) for the calculated power and given angular velocity.
How do I calculate velocity based off pitch and angular velocity? I can't find any information on it.
Would it just be v=(pitch*angular velocity)/2pi?
v=(.001*6.28)/2*pi
=.001
(.001*4450/.35)/6.28= 2.023
andIt looks like you are plugging numbers into random equations and hoping for the right answer..
You need to include all units.
orangeincup said:I'll write it more clearly.
A power screw works by converting rotational motion into linear motion. When a motor or other power source turns the screw, the threads of the screw engage with the threads of a nut or other object, causing the screw to move in a linear direction. This linear motion can then be used to lift a load.
Power screws have several advantages over other types of lifting mechanisms, such as pulleys or hydraulic lifts. They are relatively simple and easy to manufacture, they can lift heavy loads with less force, and they have a high mechanical advantage, meaning they can lift the load with less input force.
The lifting capacity of a power screw is affected by several factors, including the pitch of the threads, the diameter of the screw, the friction between the threads, and the efficiency of the power source. In general, a screw with a larger diameter and finer threads will have a higher lifting capacity.
Yes, a power screw can be used to lower a load by reversing the direction of the motor or other power source. When the screw rotates in the opposite direction, the threads will disengage and the load will be lowered. This is a useful feature for precise and controlled lowering of heavy objects.
Power screws are commonly used in various lifting systems, such as scissor lifts, car jacks, and elevators. They are also used in industrial machinery for moving heavy objects, and in robotics and automation for precise positioning of components. Power screws are versatile and can be found in various industries, from construction to manufacturing to healthcare.