How to Make Money With a CNC Plasma Machine
Plasma cutting earns on speed, not on tolerance. This guide shows six streams that actually pay, the plate range where plasma beats laser on cost, and how to price an hour so the machine covers its own payment. Written for shop owners and fabricators deciding whether a table will pay for itself.
Key takeaways
Which jobs a CNC plasma machine actually wins
A plasma table cuts by melting metal with a constricted arc and blowing the molten pool through the kerf. That process is fast and cheap on carbon steel plate, and it is the reason a 25 mm plate can be cut at speeds a laser of the same price cannot touch. The trade-off is edge quality. A typical air-plasma cut leaves a kerf of roughly 1.5–3 mm, a bevel of 3–8°, and a heat-affected zone of 0.25–1 mm depending on thickness and amperage.
That trade-off sets your customer list. If the drawing calls for a ±0.1 mm fit, tapped holes, or a Ra 0.8–1.6 μm face, plasma alone will not get there. If the drawing is a 6 mm A36 gusset with a 12 mm bolt hole and a 2 mm edge finish allowance, plasma is the cheapest way to make it. Most profitable plasma shops stay on the second kind of part and send the first kind out.
Plate thickness is the second boundary. On carbon steel, a 105 A air-plasma setup cuts 3 mm plate at 4,000–5,000 mm/min, 12 mm at roughly 1,300 mm/min, and 25 mm at 400–600 mm/min. Below 3 mm, dross and warping climb and laser starts to win on total cost. Above 25 mm, speed collapses and the cut needs a secondary operation anyway.
Stainless and aluminum behave differently. Stainless needs a nitrogen or H35 mix to keep the cut face clean, and aluminum needs higher current plus a clean, dry air supply. If most of your incoming work is 6061 or 304, budget for a gas mixer and a refrigerated dryer before you quote the first job.
So the honest framing is this: a CNC plasma machine makes money when the part is flat, the tolerance is loose, and the volume is repeatable. Everything else is a different machine.
Six revenue streams for a CNC plasma machine
Custom metal art and architectural decor is the stream most people start with, and it is also the least stable. Signs, gate panels, table bases, and planter rings sell well in local markets, but every order is a new design, a new nest, and a new finish. The money is in repeatable product lines: five or six designs you have already nested, cut at a fixed price, with powder coating or black oxide added as an upsell.
Industrial and commercial part fabrication is where the steady revenue sits. Maintenance shops, conveyor builders, and OEMs need gussets, mounting plates, guards, flanges, and shim packs. These parts are usually 3–20 mm carbon steel, tolerance of ±0.5 mm is acceptable, and the same drawing comes back every month. That repeatability is what lets you amortize programming and nesting time to nearly zero.
Prototyping for startups and machine builders is the third stream and the one with the highest margin per hour. A startup that needs three brackets for a fixture will pay for speed, not for unit cost. The risk is scope creep: a plasma prototype often needs a tapped hole or a turned boss, which means a second operation. Quote the plasma cut and the secondary machining as two separate line items.
Automotive and off-road work covers skid plates, shock mounts, bumper plates, and chassis reinforcement. Mild steel and 4130 are common. This work pays well but carries liability, so keep the drawing and material certs on file. Agricultural equipment repair is similar but more seasonal, with strong demand before planting and harvest.
Contract cutting for other fabrication shops is the fifth stream and the easiest to fill. Many small weld shops own a press brake and a welder but no cutting table. If you can turn a nested job around in 24–48 hours and hold ±0.5 mm, you become their cutting department. Volume matters more than margin here.
The sixth stream is stock work: cutting standard blanks, base plates, and hole patterns you sell from inventory. It is boring, and it is the closest thing to predictable cash in this business.
How to price plasma cutting so the machine pays for itself
Start with what the table costs per hour to own. Add the machine payment, floor space, power, compressed air or gas, and the operator's loaded wage. Divide by the hours you realistically run per month, not the hours you hope to run. If the machine runs 120 hours a month and total ownership is a known monthly figure, that quotient is your floor. Every quote has to clear it.
Then add the variable cost of the job: plate weight, consumables, gas, and any secondary operation. Plate is usually the largest single line. Weigh the nest, not the part. The difference between the part weight and the nest weight is scrap you already paid for.
The pricing method that survives contact with customers is a setup fee plus a per-pierce rate plus a per-meter rate. Setup covers programming and nesting, pierces cover the slowest part of the cycle, and the per-meter rate covers the cut. A part with 60 holes and a 400 mm outline looks cheap by weight and is expensive to cut. Price it accordingly.
Watch three numbers weekly: meters cut per consumable set, plate utilization percentage, and the share of jobs that needed a rework pass. If consumable life drops, check air quality before you blame the torch. If utilization drops, your nesting software settings drifted. If rework climbs, you are taking work the table should not have taken.
A plasma table is not a machining center. It is a fast, low-cost plate cutter. Shops that make money with one treat it that way and stop trying to sell it as a precision tool.
Step by step: from unboxing to a paying job
Do these in order. Skipping step 3 is the most common reason a new table loses money in month one.
- 11. Size the machine to the work you already haveMeasure the largest plate you expect to cut, then add 200 mm of margin. A 1,500 × 3,000 mm table covers most job-shop work; a 1,250 × 2,500 mm table is cheaper and easier to ventilate. Do not buy for a job you have not quoted.
- 22. Set up the air and gas supply firstAir plasma needs clean, dry air at 0.6–0.8 MPa and a dew point below 5 °C. Fit a refrigerated dryer and a coalescing filter. Wet air ruins consumables and gives you dross on every cut.
- 33. Build a consumable cost sheet before your first quoteTrack electrode and nozzle life per meter of cut. On 12 mm carbon steel at 105 A, expect roughly 300–600 pierces or 60–90 minutes of arc time per set. Divide the set price by that number and you have your true cost per meter.
- 44. Dial in cut charts for three thicknesses onlyPick 3 mm, 12 mm, and 20 mm carbon steel. For each, record amperage, cut height (1.0–1.5 mm), pierce height (3–5 mm), pierce delay (0.3–1.2 s), and speed. Post that sheet at the table. Operators who guess at pierce delay burn nozzles.
- 55. Nest for plate utilization, not speedSet a 6 mm common-line or chain cut where the geometry allows, and keep parts at least 8 mm from the plate edge. A nest that saves 12% of a 1,220 × 2,440 mm sheet saves more money than a 12% faster feed rate ever will.
- 66. Quote per pierce plus per meterCharge a base setup fee, then a rate per pierce and a rate per meter of cut. A part with 40 small holes has 40 pierces; pricing it by weight alone will lose money on every order.
- 77. Add one finishing partner before you need themPowder coating, anodizing, and tumbling are usually outsourced. Line up a coater and a machining supplier early so a customer asking for a finished part does not stall your schedule.
Which work belongs on the plasma table
Use this to decide whether to quote in-house or send the job out.
| Job type | Plasma table | Send out to | Why |
|---|---|---|---|
| 3–25 mm carbon steel bracket | Yes | — | Fast cut, ±0.5 mm is enough |
| Gusset with bolt holes | Yes | — | Punched or drilled after cutting |
| Plate under 3 mm | No | Laser or waterjet | Dross, warp, edge quality |
| Plate over 25 mm | No | Waterjet or oxy-fuel | Plasma speed collapses |
| Tapped holes and bores | Cut only | CNC mill | Tapping needs a rigid spindle |
| Bearing bores under ±0.05 mm | No | CNC mill | Plasma cannot hold the tolerance |
| Decorative sign panels | Yes | Coater | Cut in-house, finish outside |
| Stainless food-contact parts | Cut only | Mill and passivation | Nitrogen cut plus passivation |
The honest verdict
A CNC plasma machine pays when the parts are flat, 3–25 mm, and repeatable. Take the repeat work, send the tight-tolerance features to a machine shop, and price every job per pierce and per meter.
Frequently asked questions
How thick can a CNC plasma machine cut profitably?
On carbon steel, 3–25 mm is the working range for most air-plasma tables. Below 3 mm, dross and heat distortion rise and laser usually wins on total cost.
Above 25 mm the cut is possible but slow, and the edge almost always needs a secondary operation. Treat 25 mm as the practical ceiling unless you have a specific high-current setup.
What tolerance can I promise a customer?
For a well-tuned table on 3–12 mm carbon steel, a general profile tolerance of ±0.5 mm and a hole diameter tolerance of ±0.25 mm is realistic. Hole roundness and taper are the usual complaints.
If a drawing needs ±0.05 mm or a fine surface finish, cut the profile on the plasma table and machine the critical features on a mill. Quoting the whole part as plasma work will cost you the customer.
How long do consumables last?
Electrode and nozzle life depends on amperage, pierce count, and air quality. At 105 A on 12 mm carbon steel, expect roughly 300–600 pierces or 60–90 minutes of arc time per set.
Piercing thick plate too slowly is the fastest way to destroy a nozzle. Set pierce height at 3–5 mm and keep pierce delay inside the cut chart range for that thickness.
Do I need a 5-axis plasma table?
Only if you cut a lot of pipe, tube, or heavily bevelled weld preps. A 3-axis table with a good nesting setup covers flat plate work.
If you do need bevelled edges for a weld joint, a rotary or tilting head can pay for itself, but check that your CAD and post-processor support the bevel angles you plan to cut.
Can a plasma shop also take machining work?
Yes, and the combination is usually more profitable than either process alone. Plasma cuts the blank fast and cheap; a mill handles the tapped holes, bores, and faces.
If you do not want to buy a mill, partner with a machine shop for those operations. GreatLight runs 127 high-precision CNC machines with tolerances to ±0.005 mm, so cut-plate work can be finished to print without a second sourcing cycle. Quote the plasma cut and the secondary machining as separate line items so the customer sees both costs.
What should I check before buying a used table?
Check the rail and gantry for backlash, inspect the torch height control, and run a test cut on 12 mm plate. Look at the cut face for dross and bevel.
Ask how many hours the power supply has run and whether the air dryer and filters were replaced on schedule. A cheap table with a worn torch and wet air will cost more than a new one.
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