What is the purpose of the external jumper wire on a variable-speed reversing drill switch
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The purpose of the external jumper wire on a variable-speed reversing drill switch is to provide a means of controlling the direction of rotation of the drill. The jumper wire connects two terminals on the switch, allowing it to reverse the current flow to the motor.
To understand the purpose of the external jumper wire, let's go over how a variable-speed reversing drill switch works:
1. In a variable-speed reversing drill, the switch is usually a combination of a variable speed control and a direction switch.
2. The speed control part of the switch adjusts the voltage or current supplied to the motor, thus controlling the drilling speed. This part of the switch usually has a potentiometer or a variable resistor that allows you to adjust the speed.
3. The reversing part of the switch changes the direction of rotation of the drill. It achieves this by reversing the current flow to the motor.
4. The external jumper wire is used to determine the default direction of rotation when the switch is powered on. By connecting specific terminals on the switch, you can set whether the drill will rotate clockwise or counterclockwise when initially turned on.
So, the purpose of the external jumper wire is to control the default direction of rotation for the drill when the switch is powered on. Depending on the specific wiring configuration, you can change the direction by repositioning the external jumper wire. This allows users to select the desired direction without having to manually change it every time the drill is turned on.