OM4500 (98 - 178") Orbital Milling Machine

A unique concept for machining of large diameter flanges which provides fast material removal with high overall flatness accuracy. Specifically developed for machining large crane pedestals and hydroelectric repairs as well as being used in the ship building industry.

Facing Range: 98.0 - 178.0" Clamping Range: 98.0 - 160.0"


  • Precision preloaded drive bearing
  • Adjustable fast set hydraulic chuck
  • Anti back lash drive for vertical machining
  • Precision build for flange flatness tolerances

Technical Specifications

Minimum facing diameter 2500mm 98"
Maximum facing diameter 4500mm 178”
Minimum clamping diameter 2500mm 98"
Maximum clamping diameter 4000mm 157"
R.P.M – Min: 0 Max: 5
Spindle travel 80mm 3.15"
Milling spindle - hydraulic (standard) 5.0 Hp 3.7 Kw
Drive – hydraulic @ 70 bar (1050 p.s.i) 5.0 Hp 3.7 Kw
Hydraulic supply required 60 L/min 15 gal/min
Feed Rates
Facing feed 400 mm/min
Machine Weight
Machine weight 2976 kgs 6547 lbs
Shipping Weights & Dimensions
Shipping weight 7107 Kgs (15635 lbs)
Shipping dimensions drive L - 271cm (107”) W- 231cm (91”) H- 97cm (38”)
Shipping dimensions base L - 375cm (147") W - 83cm (33") H - 79cm (31")

The machine is supplied complete with drive ring, drive motors and reduction gearbox, facing feed /direction gearbox and pick up gearbox, Milling facing arm and 90mm column spindle, internal chuck base assembly, jaw blocks and 8 of clamping jaws - 4 off which are adjustable, toolkit, hose kit and centre distributor, all required bolts and storage / shipping box, CE certificate, Packing list and Manual. Optional– Production quick install hydraulic chuck mounting system, hydraulic trolley power pack.