Circuit Points of the machines

As you keep the foot pedal pushed down, slowly turn the contact screw down to meet the contact point. Your machine will start to run when the contacts get close enough together to make a circuit. A general rule of thumb is that the gap between the shader points when you push down on the armature bar is the thickness of a nickel. The gap between the points on the liner should be about the thickness of a dime. Nickel shader, dime liner. This distance will change slightly with each machine and with the shape the springs are in. If they are weak, you can compensate by turning down the contact screw a bit, not too much. This measure has to be done with the machine off and the armature bar held in the down position. On a machine with heavy-duty coils, this measurement may be doubled. Another way to do it, is to eyeball the distance the armature bar is travelling, as the machine runs, while you adjust the contact screw. When the distance the armature bar is travelling up and down is about the same distance as a dime or a nickel, depending on which machine you are tuning at the time, then you are right.

Filed under: Setting Machines

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