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		Working on Long-hole Cutting Machines - Course: Mechanical woodworking techniques. Trainees' handbook of lessons (Institut für Berufliche Entwicklung, 12 p.)
			(introduction...)
			1. The Purpose of Drilling and Cutting with Long-hole Cutters
			2. The Construction of a Long-hole Cutting Machine
			3. The Tools
			4. The Operation of the Long-hole Cutting Machine
			5. Technological Processes of Drilling and Cutting

4. The Operation of the Long-hole Cutting Machine

Switching on the machine the bore chuck with the clamped tool is set into rotation, depending on the type of the machine from 1400 up to 11000 revolutions per minute. Now the drilling tool is pressed against the piece of work. By shaving off the piece of work round bores and long holes across and with the grain of the wood are manufactured.

Round bores up to a maximum depth of 200 mm are drilled by the axial movement of the bore shaft.

Long holes up to a maximum length of 200 mm are manufactured by lining up several round bores and cutting out the remaining wood stays.

Figure 6 - Cutting out of lined up round bores to form a long hole

1 long-hole cutter, 2 round bores, 3 wooden board

In which way are manufactured long holes with long-hole cutting machines?
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