specializes in the design and construction of the following types of
very large machine tools:
Single Column Vertical Turning and Boring Mills
Double Column Vertical Turning and Boring Mills
Gantry Milling and or Turning Centers (GanMill)
Horizontal Boring Mills (HoriMill)
CNC Gear Hobbing
Horizontal Lathe (DL)
Incorporating the latest state-of-the-art technologies and design methods, all SCHIESS BRIGHTON machines exhibit uniformly excellent accuracy, reliability and productivity characteristics. The new machines are designed based on a system of common modular sub-assemblies. The advantages of the design features listed in this catalogue apply to all SCHIESS BRIGHTON machines.
The customer benefits from this modular design concept are:
Service procedures are similar in all SCHIESS BRIGHTON machines;
A commonality of spare parts can be used for different machines;
Attachments are interchangeable between several machines types.
All major structures such as beds, columns, cross rails, table bases
and tables, are made of very rigid and well ribbed castings or
fabrications which are designed to absorb vibration and resist high
bending and torsional forces. These are pre-conditions for high
accuracy and high static and dynamic stiffness.
All linear and rotary guide ways use hydrostatic way bearings and
are therefore absolutely free of wear thus guaranteeing that the
initial accuracy remains constant throughout the lifetime of the
machine. Hydrostatics provide excellent damping characteristics
which translates into high surface finish quality in the work piece,
and the lack of friction between the sliding members results in high
positioning and contouring accuracy.
The versatility of the machines is due to a built-in milling spindle
in the ram, which in connection with the built-in C-axis and the
Master-Head design principle (namely exchangeable boring and milling
heads for different applications) allow multiple axis machining.
High power turning and milling drives allow heavy duty machining by
fully utilizing modern cutting tool performance.
Rotary tables and turn tables have cast iron tops and load
capacities up to 1000 tons. The drive mechanism is an advanced
design whereby drive motors are connected in tandem to double
pinions to either drive the table gear in combination to achieve
high rotational speed and torque, or in opposition so as to
eliminate backlash for rotary milling operations in the C- or
B-axes. Actual table position is always measured at the table center
by direct rotary scales such as made by Heidenhain. The table
bearings are hydrostatic with individual valves controlling the
precise flow required at each pocket. These bearings are located at
the periphery of the tables thus allowing large work piece weights
and off center loads. Tapered roller bearings at the table centers
prevent run out errors.
All feed drive systems, linear and circular are electronically
preloaded and equipped with direct measuring systems made by
Heidenhain. Axes with less than 6 m of travel are equipped with
re-circulating ball screws and preloaded double nuts.
Because many large machines of the former SCHIESS company
still perform well even after many decades in different fields of
application, numerous proven standard and special attachments are
available in order to increase the productivity of machining large
components in only one or two set ups. Complex machines with
different attachments could have as many as 12 CNC-axes.
In order to increase and/or maintain accuracies under different
static or ambient thermal conditions, mechanical and electronic
compensation systems are built-in as standard features.
Rams may be equipped, optionally, with a built-in C-axis. This
consists of a sleeve around the spindle which is driven by a servo
motor mounted coaxially with the main spindle motor within the ram.
This feature allows the indexing or continuous feeding of various
accessories mounted on the face of the ram, in the C-axis.
The boring and milling spindle is directly supported by high
precision, pre-loaded spindle bearings, which are free of wear even
when subjected to high torque and high revolution forces. These
bearings provide high circularity for boring and excellent milling