Dealing with Back Drive in a Linear Slide
In a vertical orientation, back drive can occur by the load (or carriage) alone, causing the carriage to drift down. Vibration and other external factors can also cause this movement. Generally, a lead screw with efficiency greater than 50% will have a tendency to back drive.
Use the formula below to calculate the Back Drive Torque being created in a given slide system.
If you wish to have no movement of the carriage, the motor, brake and possibly screw efficiency come into play. The motor will typically have a holding torque value under power or detent torque at stop. This is the value at which the motor will resist movement until this torque is over run. A brake is generally utilized for positive holding, especially a system in vertical orientation.
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