Oxford Cutmaker 451 - Industrial Single-Phase Inverter Plasma Cutter.

The Oxford Cutmaker 451 is a high-performance, UK-manufactured inverter plasma cutting system engineered for precision, durability, and multi-process flexibility. Ideal for fabrication shops, maintenance workshops, and light industrial use, it delivers clean, efficient cuts on a variety of metals while offering additional functions like gouging, marking, and heating. 

 Key Features & Capabilities

• Power & Output Range
  The unit operates on single-phase 230 V supply and delivers up to 45A @ 13 8V (≈ 6.2 kW) output in normal mode.

• Cutting Performance

  • Clean (recommended) cut in mild steel: up to 18 mm

  • Maximum severance cut: 30 mm

  • Maximum piercing thickness:12mm

  • Cutting Speeds

    • 15 mm: ~0.46 m/min 

    • 20 mm: ~0.25 m/min 

    • 30 mm: ~0.10 m/min

• The Cutmaker 451 achieves the following approximate speeds in mild steel:

• Duty Cycle & Operation
  Designed with a 50% duty cycle at the full 45 A rating. It provides a 100% (continuous) duty rating at about 33 A. 

• Integrated Multi-Process Functions

  • Gouging mode: Lower air pressure setting and adapted consumables allow metal removal and weld preparation tasks. 

  • Thermal heating: Up to ~1.8 kW of concentrated heating for preheating, loosening seized parts or light heating tasks. 

  • Metal marking: Fast, clean marking using the same consumables as cutting—ideal for layout and identifiers. 

  • Rapid restart mode (optional): Automatic arc re-strike for discontinuous cuts, e.g. mesh or grills. 

• Non-HF Pilot Arc Start
  Uses a non high-frequency (non-HF) pilot arc system to reduce electromagnetic interference and make it safer to use near sensitive electronics and CNC tables.

• CNC / Automated Compatibility
  The unit includes built-in wiring and interface circuitry for CNC cutting tables and robotic systems (via optional 14-pin CPC connection) for automated control. 

• Power & Supply Adaptability
  The Cutmaker 451 is generator-friendly, featuring protection against over/under voltage, over-current, over-temperature, and auto compensation for long extension leads up to 100 m. 

• Construction & Durability
  Built in the UK, the design emphasises ruggedness and simplicity. It features a cooling chamber to keep contaminants away from electronics and “fan on demand” operation (fan runs only when needed to reduce dust ingestion). 

The Oxford Cutmaker 451 Plasma cutter offers exceptional cutting performance on all metals. The design produces a nicely constricted arc minimising kerf
width & maximising cut capacity & speed. This results in a very straight clean cut with minimal dross. Even on thick materials such
as 30 or 40mm the cut will be clean & close to perfectly straight. Compared with a low cost foreign plasmas the performance
difference is almost unbelievable. Compared to using oxy-fuel (gas bottles) cutting speed can be more than 5 times as fast &
operating costs coming out at around 90% reduced, you also get a better cut quality.
Drag cutting parts are fitted to all hand torches, drag cutting is the easiest & neatest option for hand plasma, it gives better access
than other plasma torch designs & allows you to follow straight edges or templates with ease. In addition, a range of extended
consumables are available for getting into those tight tricky jobs. For cutting below 50A its also possible to carry out tip contact
cutting, dragging the cutting tip directly on the job gives even more precision & visual access to the cutting point.
CUTMAKER models can also cut the very thinnest of metals with absolute precision, smaller models using the P75 torch work
especially well from 0.5mm upwards. Models fitted with the P130 can use the optional ‘fine cut’ consumables to give similar results.
Mechanised cutting performance is exceptional, just plug in our P75M or P130M machine torch & fit the CPC connector then you
are ready to use on cutting tables, straight line cutters, robot etc. CNC interface uses the same wiring as US made machines, start
signal, OK to move contact & we also have adjustable divided arc volts. This can be set to give 20:1, 30:1, 40:1, 50:1 & anything in-
between. This gives compatibility with all known cutting tables & THC systems.

Thermal gouging
These models all give great gouging performance from small light jobs right up to the heaviest plate. The arc stretch is unbeatable
giving you smoother finishes & better control. Remove welds, wear plates, create weld preps, etc. Can also be used for automated
gouging with robots or Gullco carriages & tractors. For gouging use simply replace the tip & shield for gouge parts & reduce air
pressure by around 1 bar.
Metal marking
Our metal marking function allows fast clean marking of metals for both automated & manual use. Mark drill points, fold marks, add
your logo, date code, ID, etc. Unlike competitors’ products we use standard cut consumables, so move from cutting to marking in a
second!
Thermal heating
A fast source of direct heat for manual use, mainly to assist with the removal of seized nuts, bearings, & light preheating jobs. This
function provides 1.8kw / 2.7kw output of intense instant heat far hotter than propane or butane torches produce. It’s also a more
direct & controllable heat so heats only the item you need heating, the torch cooling air keeps everything else at a low temperature.
For instance when removing seized nuts propane torches tend to heat the nut & bolt, Cutmaker plasmas can heat the nut & leave
the bolt relatively cool, allowing the nut to be removed quicker.
The following are typical times to heat nuts to cherry red. M5 – 3 secs, M6 – 5 secs, M8 – 8 secs, M10 – 14 secs, M12 – 20 secs.
In addition, thermal heating function can be used to bend plastic parts or for plastic welding.
Thermal heating can be done with cutting consumables fitted for a tight heat focus or gouging parts fitted for a softer wider arc.

OPERATORS MANUAL

Click here for consumables

Technical Data

Oxford CUTMAKER models redefine what's possible from a plasma. Look at our performance specs & you will notice our machines cut more & do more than all other machines on the market today. And importantly like all OXFORD machines we use rugged reliable technology so you don't need to be concerned about reliability or lifespan. Our inverter design is unique, simple internal construction, only 2 power IGBT modules fitted & one control PCB. These models are not affected by damp or harsh conditions such as dusty dirty workshops, knocks & drops, unstable input voltages cause no harm, even large under or over voltages can be tolerated. Furthermore, no electronic degree needed to maintain these, they are serviceable by any electrical technician anywhere in the world.

migtigarc  is also the authorised service centre for Oxford in the Hampshire region.