On Site Turning and Milling


Turning

Furmanite range of journal turning machine capacities:

  • End shaft mounted, 75mm to 1220mm (3” to 48”)
  • Mid-shaft mounted, up to 560mm (22”)

Static machining attachments:

  • Limitations on what can be machined are not size but access and available mounting places. Each case should be individually assessed

Standard finishes for variable feed turning machines:

  • 1.6mm Ra to 6.3mm Ra (63 CLA to 250 CLA)
  • Static machining attachments with single point tools, 1.6mm Ra to 6.3mm Ra (63 CLA to 250 CLA)
  • Using the Furmanite in house designed orbital grinding and polishing attachments 0.8mm Ra to 1.6mm Ra (32 CLA to 63 CLA)

Tolerances achievable with turning operations:

  • For parallel shaft diameters using single point tools, finished tolerances of size + 0.012mm (0.0005”)
  • Ground or polished shafts finished tolerances of size + 0.005mm (0.0002”) is dependent on the outside diameter and material of component

Power requirements and utilities required on site:

Journal turning machines

  • Air powered machines. Air at 2.7m3/min @ 6 bar, (100 CFM @ 90 PSI)
  • Hydraulic powered machines, 415 – 440V 63 Amp 3 phase socket outlet

Milling

Furmanite range of milling machines and capacities

Furmanite Silk™   milling rails:

  • Lengths up to 2.1m (7 feet) with cutters up to 250mm (10 inches)

3D and 4D milling machines (sometimes referred to as picture frame milling machines):

  • Up to –‘x’ axis 1.8m (70”), ‘y’ axis 300mm (12”), ‘z’ axis 140mm (5”), cutters up 250mm (10”)

Key mills:

  • Up to – ‘x’ axis 200mm (8”), ‘y’ axis 57mm (2”), cutter to suit size of keyway to be cut

Surface finishes achievable with milling machines:

  • 1.6mm Ra to 6.3mm Ra (63 CLA to 250 CLA)

Achievable tolerances:

  • Key mill – size + 0.012mm (0.0005”) all axis
  • Furmanite SilkTM milling rails – ‘x’ size + 0.025mm (0.001”), ‘z’ size + 0.012mm (0.0005”)
  • 3D and 4D mills – ‘x’ size + 0.025mm (0.001”), ‘y’ and ‘z’ sizes + 0.012mm (0.0005”)

Power requirements and utilities required on site:

Air powered machines

  • 2.69m3/min @ 6 bar (95 CFM @ 90 PSI)

Hydraulic powered machines-

  • 415 – 440V 63 Amp 3 phase socket or outlet

Turning

Turning covers a large range of applications and different processes, the most common of which is journal machining. Furmanite has a range of purpose built machines for this work. In general, the machines are attached to the end of the fixed shaft or clamped to the outside diameter. Often it is only necessary to expose the area of plant or the component part to be re-machined, thus avoiding major time delays due to dismantling and costly off site transportation to a conventional workshop.

Typical turning operations include:

  • Journal turning on worn or damaged shafts for bearing surfaces, both inboard and outboard
  • Modify shafts to accept new or changed bearing configurations
  • Machine shaft seal areas and faces
  • Re-facing alternator slip rings
  • Machine drive shaft and coupling arrangements

Milling

Milling is used to either produce a plane surface or to cut out pockets or windows in metal structures. Furmanite has a range of milling machines, both the 2-axis (milling in an XY plane) and 3-axis types (milling in an XY&Z plane). A range of single purpose milling machines for undertaking specific operations is also available.

Typical operations include:

  • Milling pump or generator bases and bedplates
  • Milling division plate on heat exchangers
  • Milling flat bearing surfaces
  • Milling pockets and penetrations in structures
  • Milling gun, missile and rocket launcher seats on war ships
  • Milling flat press bedplates
  • Machining flat square flanges, manways and shaped inspection and hatch covers
  • Machining internal and external shaft keyways

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