s Instruction Manual
32
Driven tool holders
Operation instructions
Coolant requirements
– Coolant lter max 50 μm (0.002 in).
– DTH with internal coolant supply must not be
operated without coolant – Coolant must be turned
on and present before tool rotation. Running dry will
damage the internal seals. Seal damage is not cov
ered under warranty.
– For machining cast iron, only external coolant design
should be used.
– All DTH's with IC (internal coolant supply) are speci
ed for a max coolant pressure of 80 bars up to their
max. n (6000 rpm).
For drilling operations it is best to use internal coolant DTHs
with high pressure coolant.
Break in period
A break in period for DTH is essential for long life. Running
the DTH for a break in period removes the intensied friction
in all of the internal components and helps to distribute the
lubrication applied during assembly. Attention: Run DTH at
50% of max. output rpm for one hour without load. The max
rpm is specied on the DTH. For DTH with internal coolant,
apply coolant even during the break in period.