| 摘要 |
This invention is a portable pneumatic cutter tool for cutting countersinks into a workpiece (17) having pre-drilled holes (15). When pressure is applied, a piston return cylinder (57) and a feed rate cylinder (79) are also pressurized, which sets a body piston (72) and spindle piston (80) reacts against a spindle bar (82) which holds nose (94) in its outer-most limit position. A pistol grip drill (44) drives a geared belt (34) to cut the countersink after actuation by trigger (45). A flare tube shaft (14) expands a multiple finger and pad arrangement of a collet (12) to provide clamp-up on the back side of workpiece (17). Clamp-up on the front side of workpiece (17) is provided by pneumatic pressure and solid mechanical stops (16). The countersink cutter (18) advances into workpiece (17), reaching its depth, and returns automatically to its start position.
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