A pillar drill is usually a permanently installed drill . It consists of the foot, the column, a drilling table, which is adjustable along the column, and the drilling spindle , the speed of which is sometimes continuously adjustable or is set via a gear . The tools, in this case drills or drill chucks , are mounted on a Morse taper .
The heavy foot ensures a safe stand and can also store cooling lubricant , and the machine can also be firmly anchored to the ground. The column serves as a guide for the drilling table, it can be adjusted in height and radially and can be clamped. The column is, next to the table at the same time the weakest point. For heavy drilling the more stable is drill press is therefore more appropriate. The upper part contains the motor, gear unit and drill spindle to which the tool (usually a drill chuck or directly a drill) is attached ("adapted"). The speed can be set via a belt drive as well as via a stepless drive, which is implemented either via a CVT gearbox or a regulated motor .
Column drilling machines are particularly suitable for small to medium-sized workpieces. A machine vice is used to fix and move the workpiece on the drilling table . A gear transmits the power of the motor to the drill quill with drill spindle and drill chuck. The drill quill can be moved vertically downwards towards the workpiece by turning a hand rim or by means of a machine . Some drilling machines have an automatic feed that can be adjusted via a gearbox.
Use in the 21st century
Column drilling machines were used from the beginning of industrialization up to the end of the 20th century as production machines for the machining of metals , plastics and wood in particular . At the time of the economic miracle there were still many pillar drilling machine manufacturers in Germany (e.g. Alzmetall , Bluthardt, Flott , GILLARDON, Röhm , WMW , Wörner, Webo), today only Alzmetall, Flott and GILLARDON produce them. With the introduction of numerically controlled machines (NC machines) , the column drilling machine ultimately became obsolete for series production at the end of the 20th century . Today these machines are mainly used in single part production and in training; this reduces the demands on the quality of the column drilling machines. Most of the machines sold today are made in Asia.
- Grote, Karl-Heinrich, Feldhusen, Jörg (Hrsg.): DUBBEL: Taschenbuch für den Maschinenbau 23rd edition Springer Verlag, Berlin, Heidelberg 2011, ISBN 978-3-642-17306-6 .
- Bozina Perovic: Spanende Werkzeugmaschinen , Springer 2009, p. 83.