For our external lead screw motor actuators, PBC Linear uses a direct connection between the screw and the motor. The machined journal at one end of the screw is manufactured to a tight tolerance and slip fit, with little clearance, into to a hollow shaft within the motor. This method ensures the maximum engagement between the fit of the screw and the motor, resulting in the highest accuracy alignment possible. The screw is then permanently fixed by applying a laser weld around the entire diameter at the back of the motor. In some cases, the weld can be substituted with an industrial adhesive that will create a similar permanent bond between the screw and motor.
The PBC Linear method, with its close-fitting tolerances, maximum screw and motor engagement, and permanent weld minimize the need for straightening, providing the highest level of accuracy, the least amount of screw runout, and the elimination of the “snow cone” effect.