Scheppach TBT19Vario Original Bedienungsanleitung Seite 59

The axial operation of the spindle, Fig. 18
When the spindle is in the lower position, turn it by hand. If you find that
the operation is too big, proceed as follows:
Loosen the lock nut (21).
1.
Turn the screw clockwise (22), to balance the operation, without in-
2.
terfering with the up and down movement of the spindle (a little oper-
ation is normal).
Tighten the lock nut (21) again.
3.
Clamping the workpiece
As a general rule, use a machine vice or another suitable clamping de-
vice to secure a workpiece in position. Never hold the workpiece in place
with your hand! When drilling, the workpiece should be able to travel on
the drill table (4) for self-centering purposes. Ensure that the workpiece
cannot rotate. This is best achieved by placing the workpiece /machine
vice on a sturdy block.
Attention! Sheet metal parts must be clamped in to prevent them from
being torn up. Properly set the height and angle of the drill table for each
workpiece. There must be enough distance between the upper edge of
the workpiece and the tip of the drill bit.
Working speeds
Ensure that you drill at the proper speed. Drill speed is dependent on the
diameter of the drill bit and the material in question.
The table below acts as a guide for selecting the proper speed for vari-
ous materials.
The drill speeds specified are merely suggested values.
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