Cooling and lubrication units

GMN lubricating units


The electronically controlled lubrication unit PRELUB is optimally adapted to the oil-air lubricated GMN spindles and guarantees a long service life.

The precisely controllable lubricant dosing ensures effective bearing lubrication as well as maximum operating security during the start and shut-down phases.

With a maximum of 4 connections, the lubrication unit offers concomitant, individual provision to a maximum of two spindles, and takes up very little room.

The connection opportunities to commercial personal computers provides an overview of operation with a multi-language menu structure.




  • Up to 4 internal or external (GP 0: e.g. 1 x 4-way mixing manifold) lubrication point connections
  • Separate evaluation of level control
  • Electronic control with display
  • High operating comfort
  • Menu languages: DE, ENG, ES, FR, IT, JP, CN



  • PRELUB GP 2 (standard) – 2 lubrication point connections
  • PRELUB GP 4 – 4 lubrication point connections
  • PRELUB GP 0 for external mixing distributors – max. 4 lubrication point connections


  • Compressed air filter/controller with a pressure meter: Filter unit 5 μm
  • Release message for machine control after checking: Oil level, oil pressure increase and decrease, air pressure, pre-lubrication cycle
  • Timer: to adjust the cycle time to oil viscosity and spindle data
  • Feed volume of the mix distributor: 30 mm3 (standard) or 10 mm3 (UHS-series) per lubrication impulse
  • Lubrication spot connection: for PVC-pipe 6 x 1
  • Nominal voltage: 90 … 260 V AC, 50/60 Hz
  • Air supply G1/4″: pmin = 5 bar, pmax = 10 bar
  • Plug connection for energy and signal transmission
  • Dimensions: approx. 484 x 432 x 222 mm (W x H x D) / protection class IP 55
  • Color: RAL 7032 structure (gravel-gray); further colors upon request
  • Max. fuse: 6 A


Accessories required for assembly, e.g. lubricant hoses, hydraulic and air hoses, control manometer and filtered lubricants are available from GMN.


Automated timeout

1. Start pre-lubrication (release signal not used for spindle operation)

2. Several lubrication pulses within a short time, depending on the line length between the spindle and the mixing distributor (pre-lubrication cycle)

3. Release signal after the pre-lubrication time is completed

4. Transfer to the normal cycle (cycle time) as per the GMN operating manual

The duration of pre-lubrication depends upon the length of the connected

lubrication lines.

(Details: see operating manual)



In order to ensure the long-term effective lubrication function of the unit, it is necessary to filter the oil and air supply.

The provided cartridges for one maintenance-related filter exchange can be obtained from GMN.

Lubrication choice

The use of filtered oils with friction and wear-reducing additives ensure the long-term reliable operation of the spindle at maximum speeds.

Detailed specifications for the required lubricant as well as determination of cycle times and lubricant pressures are contained in the operating manual contained in the delivery.


GMN cooling units

Coolant accessories

The reliable availability of the required coolant quantity and temperature reduces the heat generation caused by the operation and ensures maximum detachable spindle speeds.

GMN cooling units ensure precisely adjustable temperature and quantity delivery of the cooling medium and achieve consistently low operating temperatures.

High-precision control accuracy reduces axial shaft misalignment, caused by temperature fluctuations in the coolant.


Design F (similar to figures) 
Design T (similar to figures) 

GMN Cooling unit K 0.9 … 11.8

  • Refrigerant: CFC-free
  • Temperature of the cooling medium: 20 °C – 25 °C
  • Control accuracy: Design T: ± 2°K / Design F: ± 1 K
  • High-precision control accuracy (upon request): (For low axial shaft spindle bearings) Design T: ± 1,2 K / Design F: ± 0,5 K
  • Allowed environmental temperature: + 42 °C
  • Connections for several spindles upon request (parallel or series connection)
  • Coolant sensor: Level and flow monitoring with a fault message contact
  • Color: Design F: RAL 5019 (capri blue) / Design T: RAL 9005 (deep black) / Further RAL-colors (upon request)

1) In addition to high-pressure monitoring, also available with low-pressure monitoring in the coolant circuit.
2) At 37 °C ambient temperature and 20 °C water temperature. The performance is reduced at higher ambient temperatures.
3) Other voltages and frequencies upon request.
4) Assumptions: Spindle power ≥ 80 kW means reduced coolant performance needs of 12% or 10%, related to spindle power.