CNC Machining and Routing Air
Spindle air, tool change, chip blow-off, and holddown sizing for CNC routers and machining centers.
Size CNC air
Industry: Wood products and woodworking
Air Compressors for Woodworking and Wood Products Plants: Size It From Your Shop
- Since 1978
- Sullair dealer since 1984
- 14 locations
- under 2 hour response
Wood Products Air Spec Plate
- CFM range
- 10 to 500+
- Pressure
- 80 to 120 psi typical
- Key apps
- CNC, finishing, fastening
- Sawmill
- High continuous CFM
- Dealer
- Sullair since 1984
What size air compressor do I need for a wood shop or wood products plant?
A wood shop running nailers, a spray booth, and a CNC router has three different air quality requirements on the same header. Nailers need volume and pressure. The spray gun needs dry oil-free air or the finish fails. The CNC router needs reliable pressure and a separate vacuum source for the holddown table. This page covers sizing for all three from one compressor room. For CNC routing specifically, the CNC machining guide covers the air functions and holddown system in detail.
Wood products compressed air lineup
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Small Rotary Screw (Shop)
- HP range
- 5 to 50 HP
- Output
- 25 to 200 CFM
- Best for
- 1 to 20 person shops
- Duty
- 100 percent rated
-
Oil-Free for Spray Finishing
- Air class
- ISO 8573-1 Class 0
- HP range
- 10 to 100 HP
- Use
- Spray booths, waterborne
- Cert
- TUV type tested
-
Larger Rotary Screw (Plant)
- HP range
- 50 to 350 HP
- Output
- 200 to 1500 CFM
- Best for
- Production plants and sawmills
- Control
- VSD demand matching
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Dryers for Wood Finishing
- Refrigerated
- Standard finish quality
- Desiccant
- Waterborne and critical
- Removes
- Moisture that ruins finish
- Point of use
- At booth inlet
45 + Years in Business
14 Midwest Locations
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Wood shop and plant air demand by application
Starting points by application. Add simultaneous loads and 20 percent margin before sizing a compressor. Use the CFM calculator for a combined shop estimate.
| Application | Typical CFM | Pressure | Notes |
|---|---|---|---|
| Brad and finish nailers | 2 to 4 CFM each | 70 to 100 psi | Intermittent duty |
| Framing nailers | 4 to 6 CFM each | 100 to 120 psi | Intermittent |
| HVLP spray gun | 6 to 18 CFM each | 30 to 45 psi at gun | Continuous while spraying |
| Conventional spray gun | 10 to 25 CFM each | 50 to 90 psi at gun | Continuous |
| CNC router (air functions) | 10 to 25 CFM | 80 to 100 psi | Continuous; holddown is separate vacuum |
| Air sander (orbital) | 5 to 10 CFM each | 90 psi | Intermittent |
| Air sander (belt) | 15 to 25 CFM each | 90 psi | Continuous while running |
Run the numbers yourself
- CFM calculator: combine your simultaneous nailers, spray guns, sanders, and CNC air into one compressor size.
- Air receiver tank calculator: size the tank that steadies pressure at the spray booth and CNC router through demand spikes.
- Compressed air leak calculator: price the leaks in shop headers and quick-connects that drain capacity from the finishing line.
Application-Specific Guide
What compressed air really costs
- 10% of US industrial electricity goes to compressed air Source: US DOE Compressed Air Sourcebook
- 20 to 30% of compressed air is typically lost to leaks Source: US DOE Compressed Air Sourcebook
- 75% of ten year compressor cost is energy, not purchase price Source: CAGI life cycle cost data
- under 2 hr average emergency response across our territory Source: Brabazon dispatch
Where wood shops and plants use compressed air
-
Pneumatic nailers and staplers
Framing, finish, and brad nailers at 70 to 100 psi, the highest volume in cabinet and furniture shops.
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Spray finishing
HVLP and conventional spray guns for stain, lacquer, and waterborne paint in booths and open areas.
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CNC routing
Spindle cooling, pneumatic tool changes, and vacuum holddown tables on production routers.
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Sanding and grinding
Orbital, belt, and random-orbit air sanders for production and finishing operations.
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Clamp and press actuation
Air cylinders clamping panels and doors during glue-up and edge banding.
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Sawmill utility air
Saw arbor functions, chip conveying, pneumatic controls, and equipment cleaning at production sawmills.
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Conveyor and material handling
Air-powered hoists, slides, and transfer stations moving slabs and panels.
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Dust and chip blow-off
Clearing machines, fixtures, and parts between operations throughout the shift.
What keeps wood shop air from ruining the finish
Four disciplines separate a shop where the spray line runs cleanly from one that blames the gun for finish failures caused by the compressor room.
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Moisture and spray finish quality
Water in air lines causes fish-eye, blushing, and adhesion failures in lacquer and waterborne coatings. A refrigerated dryer handles the baseline. Waterborne finishes and high-humidity seasons push many shops toward a desiccant dryer on the spray circuit. The cost of a dryer is far less than a batch of rework.
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Sizing for CNC routers and machining centers
CNC routers use air for spindle cooling, pneumatic tool changes, and often for the vacuum holddown system. Most single-spindle routers need 10 to 25 CFM at 80 to 100 psi for the air functions. The vacuum pump on the holddown table is a separate system that must be sized independently from the compressed air.
-
Sawmill compressed air requirements
Production sawmills run compressed air for saw arbor functions, pneumatic controls, and chip handling. The demand is often high continuous CFM at moderate pressure. Rotary screw compressors suit sawmill duty because they run at 100 percent duty cycle indefinitely, unlike piston units that require rest time between cycles.
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Oil-free for contact finishes
Waterborne and UV-cured finishes are sensitive to oil contamination from the air supply. A TUV-certified oil-free compressor or an oil-injected machine with a high-efficiency coalescing filter train eliminates the risk. The oil-free path simplifies maintenance when the spray line is the primary air demand.
Recommended setup for wood shops and plants
For a production furniture or cabinet shop, the starting point we recommend is a 25 to 50 HP rotary screw compressor with a refrigerated dryer serving nailers, presses, and material handling. Spray finishing runs from the same header with a coalescing filter and, for waterborne products, a desiccant polisher at the spray booth. CNC routers need their own sizing pass because the vacuum holddown table is a separate system from the compressed air. For that, see the CNC routing guide. Sawmill operations step up to 100 HP and above to serve pneumatic controls and high-volume utility air continuously across the full shift.
When a piston compressor is still the right call: a one or two nailer crew
doing rough framing does not need a rotary screw. A quality piston unit sized for the nailer
CFM plus modest blow-off is faster and cheaper for low-duty-cycle fastening work. The rotary
screw earns its price at a spray line, a CNC router, or any load running more than a few
hours per day.
Typical project: wood finishing air quality
Spray finish rejects cut by more than 80 percent with correct drying
A common scenario in this industry is a cabinet manufacturer running a large piston compressor on a spray finishing line and seeing chronic fish-eye in lacquer during humid summer months. The usual root cause is inadequate moisture removal: the piston tank discharges wet air at the spray gun. A typical project replaces the piston unit with a 25 HP rotary screw and a refrigerated dryer, plus a desiccant polisher at the spray booth inlet. Finish rejects fall sharply within the first humid season, and the spray crew stops fighting moisture-related callbacks on finished cabinets. Brabazon sizes and installs the compressor, dryer, and point-of-use filtration for this kind of finishing upgrade.
Wood shop and plant support across the Midwest
Factory-trained technicians dispatch from 14 branches with an under 2 hour average emergency response. Find your nearest branch:
Questions engineers actually ask us
What size air compressor do I need for a woodworking shop?
Add the CFM of the tools you run at the same time, not all the tools in the shop. Two finish nailers and a spray gun running together need roughly 20 to 30 CFM at 90 psi, which a 5 to 10 HP rotary screw handles. Add a CNC router and the demand steps up to 40 to 60 CFM. Size for simultaneous use, not the nameplate total of every tool on the wall.
Does woodworking need an oil-free compressor?
For spray finishing, you need clean, dry, oil-free air at the gun. This means either an oil-free compressor or an oil-injected machine with a refrigerated dryer and coalescing filtration. Nailers and actuators are not sensitive to oil content and run fine on a standard oil-injected compressor. Splitting the spray circuit from the shop circuit is common in production shops.
What air compressor is best for a wood spray booth?
A rotary screw in the 5 to 25 HP range with a refrigerated dryer and a coalescing filter at the booth inlet is the standard setup. For waterborne products, add a desiccant polisher at the booth. Size from the gun CFM: an HVLP gun uses 6 to 18 CFM depending on the product and tip size.
Do sawmills need a different type of air compressor?
Sawmills need continuous-duty equipment because the demand runs most of the shift. Rotary screw compressors are suited to this because they run at 100 percent duty cycle indefinitely. Sawmill demand tends to be moderate pressure, 80 to 120 psi, at higher CFM volumes for controls, chip handling, and arbor functions.
Who services wood shop air compressors in Wisconsin, Illinois, Minnesota, and Missouri?
Brabazon has served wood products and woodworking operations from 14 Midwest locations since 1978. Our factory-trained technicians dispatch with an under 2 hour average emergency response and we have been the authorized Sullair dealer since 1984.
Where to go next
Get Your Wood Shop or Plant Air System Sized
Tell us what you spray, what you run on a CNC, and how many fastening stations run at once. We size the compressor, dryers, and circuit layout for the shop you have.