Upright drilling machine
A pillar drill is a permanently installed drill . It consists of the foot, the stand, a movable drilling table 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 . In contrast to the column drilling machine , the drilling table cannot be swiveled but is also height-adjustable. In the case of the pillar drilling machine, the feed movement is generated via the movement of the table or the drilling spindle, whereas in the case of the pillar drilling machine, it is only generated by lowering the drilling spindle
construction
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 stand serves as a guide for the drilling table, which can be adjusted in height and clamped. The height is usually set using a threaded spindle attached under the table. In contrast to column drilling machines , the combination of a linear guide and a threaded spindle enables even heavy components to be machined. In the upper part are the motor, gearbox and drilling spindle to which the tool is adapted. The speed can be set both via a belt drive and via a continuously variable drive, which is implemented either via a CVT gearbox or a regulated motor.
properties
Depending on the design of the drive and its performance as well as the design of the feed gear, a different range of speeds can be covered. As a result, only a limited range of bore diameters can be processed with this machine. There are machines of this type that only have a range of applications from a few x10 revolutions to around 500 / min and are therefore more designed for holes in the range of 30 to 120 mm drilling diameter. Furthermore, there are special forms that enable the direction of rotation to be reversed via cam limit switches. This means that thread cutting is also possible in conjunction with a compensating chuck . Especially with older models, the speed and feed values are matched to the use of HSS tools.
In the case of smaller models, the work table can not only be adjusted in height using a screw clamp, but also swiveled to the side. This is generally done exclusively with muscle power by releasing the lock, raising or lowering and re-clamping the table. On the other hand, in the case of larger models, the work table is secured with a screw clamp, but height adjustment is made possible by a rack and pinion drive.
Almost all upright drilling machines have T-slots built into the work table with which drilling devices, machine vices or clamps can be used to fix the workpiece on the table.
literature
- Grote, Karl-Heinrich, Feldhusen, Jörg (Hrsg.): DUBBEL: Taschenbuch für den Maschinenbau 23rd edition Springer Verlag, Berlin, Heidelberg 2011, ISBN 978-3-642-17306-6 .
