4.5.2 Speed Change; Drilling - Optimum OPTIdrill DH 28BV Betriebsanleitung

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
infinitely variable V-belt gear is posi-
tioned at the desired V-belt diameter
using the handwheel (10) while the drill-
ing 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 1.1.4 - 2022-09-14
10
Img.4-2: Control elements DH24BV - speed

Determining the cutting speed and the speed on page 106
Originalbetriebsanleitung
DH24BV GB
95