Optimum OPTidrill DH 24BV Operating Manual page 37

4.5.2 Speed change
ATTENTION!
A change of the speed while the drilling spindle is stopped results in damages of the var-
iable speed gear. Only change the speed while the drilling spindle is turning.
The drilling-machine is equipped with a
motor with an infinitely variable
mechanic gear. The V-belt of the infi-
nitely variable V-belt gear is positioned
at the desired V-belt diameter using the
handwheel (10) while the drilling spindle
is turning. Thus the speed is changed.
The lower the spindle speed while
adjusting, the more difficult it is to turn
the handwheel.
4.5.3 Drilling
The following steps are necessary in order to carry out a proper drilling process:
Select the speed which is suitable for the used drill diameter and for the material which

needs to be manufactured.
Lower the drill by means of the spindle sleeve lever (8) until the drill tip comes into contact

with the workpiece.
Set the scale drilling depth to zero (9).

Switch on the drill spindle (4) and actuate the spindle sleeve lever for the manual feed (8).

Version 1.1.0 vom 2015-02-10
10
Img.4-2: Control elements DH24BV - speed

"Determining the cutting speed and the speed" on page 47
Original operating instructions
OPTIMUM
M A S C H I N E N - G E R M A N Y
DH24BV DE
Seite 37