2. Linear speed and rotational speed determine the lead of the ball screw. After the motor is determined, the output speed will be known. Considering the required maximum linear speed, the linear speed is obtained by multiplying the motor speed (if divided by the reduction ratio) by the lead value of the lead screw, which is greater than the required value.
3. Determine the length of the ball screw according to actual needs (total length = working stroke+nut length+safety margin+installation length+connection length+margin. If protection is added, such as sheath, the expansion ratio of sheath (generally 1: 8, that is, the maximum elongation of sheath divided by 8) needs to be considered. 4. Determine the accuracy of the ball screw according to the actual needs. General machines choose C7, and CNC machines choose C5. Choose C3 more closely. It's usually futures.
5. Determine the form of the ball screw nut according to the installation conditions and size structure (there are many kinds of nuts, and the size of different nuts is slightly different, so it is recommended not to choose too special one according to the situation to avoid maintenance difficulties).
6. Select and confirm the installation method (end). This mounting piece can be designed by yourself or bought off-the-shelf, and there are standard mounting seats to choose from. Pay attention to the stress state in your own design. It is best to choose 7000 or 3000 series bearings, because the screw is mainly subjected to axial force when working, and try to avoid radial force.
7. Draw the drawing of the ball screw according to the conditions determined above (mainly the end installation size, which should be detailed, providing the shape and position size and tolerance).