Operators Manual - Pentruder Modular Drilling system
17
Start of drill unit
See –”Start of drill system”
Important!
To avoid uncontrolled movement of the drill bit, remember to always have the lever on
the hydraulic motor on
OFF
when the power pack is started.
Drill bit
Fig. 11. Drill bit positioned to be fitted on the spindle unit - ST2.
Mounting of the drill bit through threading
1. Clean the thread and lubricate with grease.
2. Thread the drill bit onto the spindle unit. (see fig. 11).
3. Check that the drill bit is correctly fastened.
4. If a “Slider” is used, be careful to check its condition prior to use. The ST1 and ST2
spindle units produce torque levels high enough to destroy the “Slider”.
Important!
Do not use tools directly on the drill bit tube when mounting it.
Periferal speed
The peripheral speed (peripheral surface speed on the drill bit) is changed due to the
diameter of the drill bit. A big diametrer drill bit has a higher peripheral speed and a small drill
bit has less speed at the same rotational speed. As a rule, when choosing speed we can say:
•
The harder the material to drill, the lower the peripheral speed should be.
•
The more steel in the material to drill, the lower the peripheral speed should be.
•
Porous material can be drilled with a higher periferal speed.
