Hermle UWF 902 H Operating Manual page 117

5.9 Maintenance of the
Cooling-Lubricant Unit
Examine the tank daily to check that the level of
cooling-lubricant is sufficient. Swarf and inconvenient
workpiece shapes can hold back large volumes of
cooling-lubricant. In order that sufficient cooling-
lubricant is available, even with high levels of lubricant
consumption, fill the tank to the maximum level
allowed as shown on the glass oil level indicator.
Selection of Cooling-Lubricant
The HERMLE UWF's cooling-lubricant system is
fundamentally suited to all types of cooling-lubricant
in general use. Modern cooling-lubricants
significantly improve the metal cutting process.
However, when selecting cooling-lubricants you
should not just consider these cutting properties.
Choose a cooling-lubricant which fulfils the following
criteria:
• Suitable for the planned cutting processes
and which can be used for the widest range
of applications
• Suitable for the material being processed.
• Suitable for both roughing and finishing.
• Easily mixable with water (emulsions).
• Offering protection from corrosion at appropriate
concentrations.
• Not affected by decay bacteria or by fungi.
• Showing no adverse effects on the skin.
• Aiding good metal cutting performance and
leading to low levels of foaming.
• Environmentally friendly - disposal by the supplier!
• The cooling-lubricant must not become mixed
with oil from leaks. Such oil, which under certain
circumstances can get into the cooling-lubricant
must not be allowed to mix with it - instead, it
should float on the surface.
• It should be without any aggressive additives
which can attack sealings, paintwork, tubing,
or guideways.
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5.9 Maintenance of the Cooling-Lubricant Unit
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Note
The following problems can arise from using the
lubricant of the make Blaser & Co AG: The combination
of lubricants for the slide ways or the addition of
graphite and gray cast iron causes that the cooling
lubricant turns brown, which leads to dull panes etc.
Remedy: Treat the inside metal surfaces and panes
with silicone oil. Attention has to be paid to the mixing
ratio and the lower limit recommended by the
manufacturer, due to the evaporation and the
concentration of the lubricant for the slide ways. After
the weekends, suck off or ladle out the depositions on
the slide ways. Contact us in case of similar problems.
Cleaning the Return Sieves
The return sieves are located in the base of the
all-round protective enclosure. They should be cleaned
several times a day to remove dirt and swarf so that
the cooling-lubricant can flow back without interruption,
containing as few impurities as possible.
Maintenance of the Cooling-Lubricant
Mixing
When using a water-soluble cooling-lubricant,
always pour the concentrate into the water.
Danger
Wear protective goggles when mixing emulsions. If
splashes of emulsion or concentrate should get into
the eyes rinse them immediately with plenty of water.
Fill a bucket with water and calculate the volume of
concentrate needed in order to create the
mixture.
Use a measuring glass to measure the necessary
volume of concentrate, and pour this slowly into the
water, stirring the mixture continuously.
Always adhere to the prescibed mixing proportions.
Check the mixture using a refractrometer or by means
of titration.