A rotating screw advances an ideal rack by one entered lead per revolution. Torque and entered efficiency form an illustrative thrust quotient.
Worm Screw Rack Interactive Calculator
Enter lead, speed, torque, efficiency and lead angle. Thrust is an ideal power-balance quotient; the angle comparison is only 5° minus angle, not self-locking prediction.
Equation Used
- Lead is axial advance per revolution.
- Speed and torque are entered steady values.
- Efficiency is an entered constant.
- Five degrees is a declared comparison reference only.
- Friction law, tooth geometry, backlash, strength, wear and dynamics are omitted.
Screw-to-Rack Lead and Motion
The rack advances one entered lead per worm revolution; thrust is an ideal power quotient.
What This Represents
Lead kinematics and an entered-efficiency scenario.
Lead and Power Equations
F=2pi T eta/L
Pin=2pi Tn/60
Worked Scenario
At 5 mm/rev and 120 rpm, ideal rack speed is 10 mm/s.
Model Boundary
No friction angle, true self-locking, tooth contact, backlash, heat, wear or strength is calculated.
Frequently Asked Questions
Does the angle comparison predict self-locking?
No; it is only 5° minus entered angle.
Is thrust guaranteed?
No.
Is efficiency predicted?
No.
Is backlash included?
No.
Are losses speed-dependent?
No.
Can this size a drive?
No.
References
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