Forming the Flare: To form the flare place the end of the cone over the end of the tubing and turn it down until the cone is centered over the tube end. On a compression-type tool advance the cone until the flared part of the tube is solidly against the countersunk recess in the flaring bar. On a generating-type tool advance the cone the number of revolutions specified in the instructions furnished with the tool for the size of flare being formed. Check for splits, scoring or imperfections in the flare to assure that a good connection can be made.
Burnishing the Flare: Burnishing the flare can produce a tighter fitting joint. Some flaring tools have an automatic burnishing feature that polishes the flare when the cone is withdrawn. The cone is spring-loaded and polishes the flare without scoring the tube because there are no serrations in the die block.
Double Flaring: In automotive applications SAE recommends double flares for hydraulic brake lines and AC and refrigeration systems on cars and trucks. The double flaring tool is similar to the single flaring tool except for the two-step process utilized in the creation of the flare. The tube is clamped in the flaring bar above the surface a distance equal to the thickness of the shoulder on the corresponding adapter and the adapter inserted in the tube. The yoke is installed and the cone advanced against the adapter until it rests against the flaring bar forcing the end of the tube into a bell shape in the flaring bar recess. The adapter is removed and the cone advanced into the bell in the end of the tubing creating the double thickness flare.
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