Shop Vac vs Dust Deputy: Which One Should You Buy?

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What a shop vac does in a CNC shop

The shop vac is the suction source. A hose runs from the vac to the dust shoe on the router, and the vac pulls chips and dust out of the cut and into its tank or bag. All four vacs below are wet and dry models, so they handle dust and the occasional spill. The CRAFTSMAN 16 gallon and the DEWALT 6 gallon include a blower port for blowing chips and sawdust off the workbench during cleanup, and both CRAFTSMAN listings include an oversized drain for emptying liquids.

The filter is the part that works hardest. Fine dust packs the pleats, airflow drops and suction fades. A dust bag helps: the two CRAFTSMAN listings and the DEWALT include one, and it catches most of the dust before the filter.

What a dust deputy does

A dust deputy is a cyclonic pre-separator, not a vacuum. It has no motor and makes no suction of its own. The hose from the CNC plugs into the deputy’s inlet, the deputy’s outlet hose plugs into the shop vac, and the vac’s suction pulls air through the cyclone. Spinning air throws most of the dust and chips into the deputy’s bucket, while only the finest dust reaches the vac’s filter.

The filter then stays clean far longer, suction stays steady through a whole job, and emptying a bucket is faster than shaking out a pleated filter. The deputy never replaces the shop vac: without a vac pulling air through it, the cyclone does nothing.

Shop vac vs dust deputy: the verdict

Buy the shop vac first. It is the part that does the work: without suction, no dust leaves the cut. Add the dust deputy when the vac’s filter clogs faster than you like, which is what fine dust from plywood and MDF does. For a CNC that cuts a few hours a week, the vac alone is often enough; for daily cutting, the deputy earns its keep in filter life and steady suction.

The gear: four shop vacs for the shop

All four vacs below are wet and dry cannister models with cartridge filters, ranked by what their listings state about suction, build and hose hardware. Where the title or bullets disagree with the spec table, the title and bullets win, and the contradictions are called out.

CRAFTSMAN CMXEVBE17595, 16 gallon, 6.5 peak HP. The biggest tank and the strongest motor of the four, with 155 CFM and 216 air watts in the spec table, a 7 ft Dual-Flex hose in 2-1/2 in diameter and a 20-ft cord. The listing adds a rear blowing port, an oversized drain, a Qwik Lock filter, a dust bag, a utility nozzle, a car nozzle, a wet nozzle and 2 extension wands. It weighs 26 pounds with a 3 year limited warranty. Contradiction: the title and bullets say 16 gallon while the spec table says 12 gallon. The pick for the shop that wants the most capacity and the widest hose.

Shop-Vac 5989305, 5 gallon, 4.5 peak HP. A stainless steel tank on a full circumference dolly with top and side carry handles, and 59 inches of maximum suction in the spec table. The listing includes a 7-foot hose with 1.25 in accessories, 3 extension wands, a crevice tool, a gulper nozzle, a floor nozzle, a cartridge filter, a foam sleeve and a filter bag. It weighs 14.5 pounds with a 3 year warranty. Contradiction: the bullets say a 7-foot hose while the spec table says 6 feet. The pick for a shop that values a steel tank and easy rolling.

CRAFTSMAN CMXEVBE17590, 9 gallon, 4.25 peak HP. The mid-size CRAFTSMAN with 49 CFM and 50 inches of lift in the spec table, a 7 ft POS-I-LOCK hose in 1-7/8 in diameter, 2 locking extension wands, a rear exhaust port for blowing, an oversized drain and a Qwik Lock filter with a dust collection bag. It weighs 15.5 pounds with a 3 year limited warranty. Three contradictions: the title says 9 gallon while the spec table says 2.5 gallon, and the bullets say a 7 ft hose in 1-7/8 in while the spec table says 5-ft and 1-1/4 in. The pick for medium jobs where the 16 gallon model is more vac than the shop needs.

DEWALT DXV06P, 6 gallon, 4 HP. The compact pick with rubberized casters, a 10 ft power cord, a blower port and 50 inches of maximum suction in the spec table. The listing includes a 1-7/8 in by 7 ft hose, 2 extension wands, a cartridge filter, a dust bag, a floor nozzle, a utility nozzle and a crevice nozzle. It weighs 14.8 pounds, and no warranty term is stated. The pick for a tight shop where a small vac lives under the bench.

Ranking: the CRAFTSMAN 16 gallon leads on capacity and hose size, the Shop-Vac 5 gallon on its steel tank and 59 inches of suction, the CRAFTSMAN 9 gallon on mid-size balance, and the DEWALT 6 gallon on compact portability with no stated warranty.

Hoses, adapters and the dust shoe

The hose is the part that has to fit. The four listings state three hose diameters: 2-1/2 in on the CRAFTSMAN 16 gallon, 1-7/8 in on the DEWALT and the CRAFTSMAN 9 gallon, and 1.25 in on the Shop-Vac. A wider hose resists clogging on chip-heavy cuts, while a narrower hose is lighter to drag around the bench. Match the hose end to the dust shoe port on the router; the extension wands in each listing are for bench and floor cleanup, not for the dust shoe. Keep runs short and straight, with the vac parked close to the CNC.

Keeping the fine dust out of the air

A shop vac catches dust at the source, but no hose catches everything. Fine dust escapes around the dust shoe and during cleanup, so the shop still needs a plan for the air. A dust mask rated for woodworking keeps the finest dust out of your lungs; see the best dust mask for CNC router guide. The four listings state 72 to 80 dB of noise, so ear protection belongs in the same drawer as the spare filters; see the best earplugs for CNC router guide.

Cutting wood also means thinking about fire: keep a suitable extinguisher within reach of the CNC and never leave a running job unattended; see the best fire extinguisher for makerspace guide.

FAQ: lasers and CNC

Do I need a dust deputy if I already own a shop vac?

Not to start. A shop vac alone collects dust fine; add the deputy when you find yourself cleaning the filter mid-job. The cyclone keeps the filter clean so suction stays steady, and emptying a bucket beats shaking out a pleated filter.

Can a shop vac replace a full dust collector on a CNC?

For one CNC with a dust shoe, a shop vac is the usual setup: the hose connects the tool straight to the vac. A dust collector serves big stationary tools with large ports. Match the vac to the tool, not to the whole shop.

Why does the filter clog so fast when cutting plywood?

Fine wood dust packs pleated filters quickly, and plywood makes plenty of it. A dust bag catches most of the dust before the filter, and a dust deputy pre-separates it into a bucket. Empty the bag or bucket before it packs solid so airflow stays up.

What hose diameter should I use for a CNC dust shoe?

The four vacs here list 2-1/2 in, 1-7/8 in and 1.25 in hoses. Use the widest hose that fits the dust shoe port: wider hoses clog less on chip-heavy cuts. The extension wands in the listings are for bench and floor cleanup.

Can I use the blower port while the CNC is cutting?

No. The blower ports on the CRAFTSMAN and DEWALT listings are for blowing chips and sawdust off the workbench during cleanup, not for use mid-cut. Blowing dust around a running CNC spreads the fine dust the vac is trying to collect.

Related: the best dust mask for woodworking, the best CNC bit set for woodworking and the ABC vs CO2 fire extinguisher comparison.