Power Screws - Stepper Motor, Lead Screw, Piston - Example 1
Torque to raise the load
Screw's linear force
Torque to lower the load
Lead Screw
Collar Friction
Thread Friction
ACME and Square Thread Profile
Main Video: Power Screws - Torque to Force Relationships in Just Over 10 Minutes
• Power Screws - Torque ...
Example 2: • Power Screws - Power R...
Example 3: • Power Screws - Self-Lo...
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Пікірлер: 18
Agree with everybody else - excellent explanation. Used your formula to calculate the axial force in my Nema stepper motor design. Thank you very much.
This is marvelous! Thanks so much!
Excellent video! thanks very much. One question though. How would you account for the "flange weight" or the weight of some object mounted on the travelling flange, that you are moving along the lead screw? Thanks!
This calculation saved my final year project 😅😅😅
In this same example if we rotate anticlock to suck in fluid into the hydraulic chamber. Can we use the formula for FL (lowering force) or it is not applicable for suction?
Thank you! How would the formula change if using an anti backlash nut? I guess there would be more friction given the spring pushing the two nuts into oposite directions.
Thank you, I have some question: 1. Example I application lead screw to mechanism as gripper to calculate force, F and load have similar??
What is the mean diameter for a ball screw? Does alpha apply to ball screws?
How did P/2 suddenly change to P/4 in the calculation of the mean diameter?
Just say you are trying to calculate the torque of a scissor jack powered by a motor, but the only values known are the weight applied,screw diameter,screw pitch and the material YOU chose for the screw, how will you get the coefficient of friction needed for the torque calculation and which part will be a considered as a collar and how will you get the coefficient of friction for the collar?
where can we submit questions
Fantastic video; I am just curious how would say a lead screw with five threads instead of one affect the formula?
@LessBoringLectures
3 жыл бұрын
Ah, that's the beauty of it. The force to torque relationship is not dependent on the number of threads (these flanges usually have 6 threads). The stresses on the other hand, would indeed be affected by number of engaged threads: kzread.info/dash/bejne/ZmqgxdeKibSXZMo.html
@AlexS-zr2nb
3 жыл бұрын
@@LessBoringLectures Thank you for the information. Now does the number of thread starts (for the example McMasters has lead screws up too 8 thread starts) does that affect torque output because they have an affect on the speed of the flange?
@LessBoringLectures
3 жыл бұрын
@@AlexS-zr2nb the number of thread starts affects this relationship by increasing the lead value (multiplying the pitch), but it doesn't affect the expression derived in the main video: kzread.info/dash/bejne/dKeovLd8ZNfJf6Q.html . The expression is independent of thread starts.
No nut for this power screw !? or the flange is the nut ?
@LessBoringLectures
3 жыл бұрын
The flange is the nut indeed!
Can you for God sake use SI units? God! American units are so backward.