- #1
Justin71
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Thread moved from the technical forums, so no Homework Template is shown
Torque Calculation for Screw Ball: TL Preload Nut
- Thread starter Justin71
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- Ball Inertia Mechanical Screw Torque
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SUMMARY
The discussion focuses on torque calculation for screw ball systems, specifically addressing the meaning of Fa, which represents the force due to acceleration (F = ma). It clarifies the distinction between low friction ball nuts and internally preloaded ball nuts, emphasizing their applications in precision versus low-cost scenarios. The conversation also touches on the inertial forces during machining processes, confirming that both acceleration and deceleration can be analyzed using the equations Fi(acceleration) = m.a and Fi(deceleration) = -m.a.
PREREQUISITES- Understanding of basic physics concepts, particularly force and acceleration (F = ma).
- Familiarity with ball screw mechanisms and their applications in machinery.
- Knowledge of torque calculations and their relevance in mechanical systems.
- Awareness of precision engineering standards and specifications.
- Research the specifications and applications of different types of ball screws, including low friction and preloaded variants.
- Study torque calculation methods specific to screw ball systems.
- Learn about the impact of inertial forces in machining processes and how to calculate them accurately.
- Explore ball screw catalogs to understand location error, backlash, and allowable speeds.
Mechanical engineers, precision machining professionals, and anyone involved in the design and application of ball screw systems will benefit from this discussion.
- #2
jrmichler
Mentor
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It appears that Fa is force due to acceleration (F = ma).
Ball nuts are available with internal clearance for low friction, or internal preload for precision motion. Low friction ball nuts are used with low precision (lower cost) ball screws in applications that tolerate location errors of 0.005" or so. Internally preloaded ball nuts are used with precision ground ball screws (higher cost) in applications where higher precision is needed. Typical applications are machine tools where the motion is controlled to +/-0.0001".
Study some ball screw catalogs. You will find specifications for location error, backlash, allowable speed, and allowable acceleration.
Ball nuts are available with internal clearance for low friction, or internal preload for precision motion. Low friction ball nuts are used with low precision (lower cost) ball screws in applications that tolerate location errors of 0.005" or so. Internally preloaded ball nuts are used with precision ground ball screws (higher cost) in applications where higher precision is needed. Typical applications are machine tools where the motion is controlled to +/-0.0001".
Study some ball screw catalogs. You will find specifications for location error, backlash, allowable speed, and allowable acceleration.
- #3
Justin71
- 7
- 0
Ok thank's a lot for your answer ! I had an other question for the acceleration (inertial force).
If we machine like drilling, we have an acceleration, then a deceleration during machining. We can decompose their inertial forces with (Fi(acceleration)=m.a and Fi(deceleration)=-m.a ? Or it's an other thing ? Thank's.
If we machine like drilling, we have an acceleration, then a deceleration during machining. We can decompose their inertial forces with (Fi(acceleration)=m.a and Fi(deceleration)=-m.a ? Or it's an other thing ? Thank's.
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