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		Working with Driling Machines - Course: Mechanical woodworking techniques. Trainees' handbook of lessons (Institut für Berufliche Entwicklung, 10 p.)
			(introduction...)
			1. The Purpose of Drilling with Drilling Machines
			2. Construction of Selected Drilling Machines
			3. Tools
			4. Mode of Operation of Drilling Machines
			5. The Technological Process of Drilling

4. Mode of Operation of Drilling Machines

The switched-on electric motor puts the drill spindle through a gear into revolving movement. If by the feed lever the drill spindle together with the clamped tool is moved into the feed direction the drilling tool can penetrate into the workpiece which is fastened on the machine table or being hold tight.

The revolving movement together with the feed movement effects the cutting by the drilling tool.