How To Know Whether Lead Screw Can Self-lock?
Publish Time: 2023-12-19 Origin: Site
The trapezoidal lead screw with a screw lift angle less than 5°has self-locking performance,after the lead screw is run to a certain position,the load can be maintained without the aid of brakes and other holding devices.Self-lock lead screw provides a higher safety factor when the motor stalls.And provides more selection schemes for designers in terms of functions.
●Lead screw self-locking calculation formula
Because of the thread profile characteristics of trapezoidal lead screw,so the spiral angle ⋋ of different specifications screw is not the same,and the equivalent friction coefficient fv between screw nuts of different materials is also different.Then apply a positive pressure F to the nut at the rated load,leadscrew and nut cannot slip when the helix angle ⋋ is less than the equivalent friction angle R,this condition called self-locking of screw.
●Common vertical self-locking lead screw models
| Diameter | Lead（mm） | Pitch(mm) | Starts |
T3.5 | T3.5*1.292 | 1.292 | 1 |
| T3.5*0.6096 | 0.6096 | 1 | |
| T4 | T4*1 | 1 | 1 |
| T5 | T5*1 | 1 | 1 |
| T5*2 | 2 | 1 | |
| T6 | T6*1 | 1 | 1 |
| T8 | T8*1 | 1 | 1 |
| T8*1.5 | 1.5 | 1 | |
| T8*2 | 2 | 1 | |
| T10 | T10*2 | 2 | 1 |
| T12 | T12*2 | 2 | 1 |
| T12*3 | 3 | 1 | |
| T14 | T14*3 | 3 | 1 |
| T20 | T20*4 | 4 | 1 |
| T20*5 | 5 | 1 | |
| T22 | T22*4 | 4 | 1 |
ALM is a leading lead screw manufacturer in China.We produce all kinds of lead screw.To obtain more models of lead screw,please contact our email：sales@autolinearmotion.com