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Manual brake setup and operation · Lesson 4 of 4

Manual brake setup and operation: defects, verification and case study

Reading a bad bend: open in the center, closed at one end, a creeping hold-down and marked paint; then a case worked through and the checks before a piece ships.

You will be able to: Diagnose uneven bends from where along the length they go wrong, choose the manufacturer's correction, and verify the piece against the drawing.

7 min · 10 slides · 5 questions

All lessons in this module
Slide 1 of 10

Check every bend in three places

Check the angle at both ends and in the center. A brake out of adjustment shows itself as a difference along the length, and where it shows points to the cause.

Correct and incorrect: checking one bend at both ends and the centerThree pieces, each checked at the left end, the center and the right end against the target angle shown dashed. Piece A is on target everywhere. Piece B is open in the center. Piece C is closed at one end.Left endCenterRight endABCOn targetOpen inthe centerClosed atone end

Three pieces checked at the left end, center and right end against a dashed target angle. A is on target in all three places. B leans open in the center. C is closed at the left end.

A
Correct: on angle at both ends and the center
B
Open in the center: check crown and center clamping pressure
C
Closed at one end: check clamping pressure and setback at that end
Where a bend goes wrong along the length points to the cause. Lean exaggerated for clarity.

Sources

Glossary

Under-bending
A bend that stays more open than the angle wanted, in one place or along the length.
Over-bending
A bend that closes past the angle wanted, in one place or along the length.
Creeping hold-down
A clamping leaf that drifts out of its setting while the brake is used.
Mold line
The theoretical sharp corner of a bend; AFS measures every leg to it.