How Many kW Does a JCW 1325 CNC Machine Run?
A JCW 1325 CNC machine never draws one fixed number. Its load is the sum of the spindle, the servo drives, the vacuum pump and the dust collector. This guide shows you how to add them up, size the feeder, and stop the nuisance trips that kill a shift. Written for maintenance engineers, plant electricians and shop owners setting up a 1300 × 2500 mm router.
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Key takeaways
How many kW does a JCW 1325 CNC machine run, subsystem by subsystem
Start with the spindle. On a 1300 × 2500 mm router the spindle is usually 5.5 kW, 7.5 kW or 9 kW. A 9 kW spindle does not sit at 9 kW all day. In MDF or hardwood it may hold 60 to 80 percent of rated power during a heavy cut. In foam or soft plastic it drops to 20 or 30 percent. So the spindle alone contributes roughly 4 to 7 kW on a normal cutting day.
Next come the axis drives. Three-phase servo drives on X, Y and Z add about 1.5 to 3 kW together during rapid moves, less during steady feed. Stepper drives run lower, near 0.8 to 1.5 kW. If the machine has a fourth rotary axis, add another 0.5 to 1 kW.
The vacuum table is the quiet consumer. A 1300 × 2500 mm bed needs a pump of 4 to 5.5 kW to hold sheet flat. It runs the whole cycle, not just during the cut, so its energy use often beats the spindle over a shift. Some shops run a smaller 2.2 kW pump and accept weaker hold-down on thin panels.
Add the dust collector at 1.5 to 3 kW, plus the control cabinet, drives cooling fan and air solenoid at 0.3 to 0.6 kW. Total the four groups and you land at 12 to 18 kW running for a typical JCW 1325 CNC machine.
- 1Spindle5.5–9 kW rated, 40–60 percent of total running load
- 2Axis drives1.5–3 kW with servos, 0.8–1.5 kW with steppers
- 3Vacuum pump4–5.5 kW for full-bed hold-down on a 1300 × 2500 mm table
- 4Dust collector and controls1.8–3.6 kW combined
Why the peak number matters more than the average
A breaker trips on current, and current follows the peak. When the spindle accelerates from 0 to 18,000 rpm it can pull 150 to 200 percent of rated power for 2 to 5 seconds. At the same moment the vacuum pump may be starting its own ramp. If you sized the breaker at running load, it will open.
Field measurements on a 9 kW spindle machine usually show 22 to 28 kW peak on a clamp meter with a 1-second capture. On a 5.5 kW spindle machine the peak drops to about 15 to 19 kW. Use the peak figure for breaker and feeder sizing, then check that the running figure stays under the continuous rating.
Voltage matters too. A machine rated 380 V will draw higher current on a 220 V supply for the same power. If your shop runs 220 V single-phase for small machines, a 1325 router is not a good fit. These beds want 380 V three-phase or 480 V three-phase.
Power factor sits near 0.85 to 0.95 on modern VFD-driven routers. If you measure kVA on the panel, divide by 0.9 to get a realistic kW estimate. Do not confuse the two when you compare quotes.
Feeder, breaker and generator sizing for a 1325 router
For a 15 kW running and 25 kW peak machine at 380 V three-phase, the running current is about 25 A and the peak current about 42 A. A 50 A breaker with a D-curve trip handles the inrush without nuisance trips. A 40 A breaker may hold, but it sits close to the edge and will fail on a hot afternoon.
Cable size follows the breaker, not the average load. For a 50 A feeder over 20 m, use 10 mm² copper. Push the run to 40 m and step up to 16 mm² to keep voltage drop under 3 percent. Long thin runs are the second most common cause of spindle faults after bad grounding.
If you run the router from a generator, size it at 1.5 to 2 times the peak kW. A 25 kW peak machine needs a 40 to 50 kVA genset with an automatic voltage regulator. Undersized generators cause the spindle drive to fault on undervoltage during ramp-up, and the fault often looks like a drive failure when it is really a supply problem.
Keep the machine on its own feeder. Sharing a feeder with a welder or a large compressor invites voltage sag, which shows up as poor surface finish and random servo alarms. A separate panel also makes it easy to log energy use per machine.
- 1Breaker50 A D-curve for 380 V, 9 kW spindle machines
- 2Feeder cable10 mm² up to 20 m, 16 mm² up to 40 m
- 3Generator1.5–2× peak kW, with AVR
- 4Separate circuitDo not share with welders or large compressors
When a 1325 router is the wrong machine for the part
A 1325 router is built for sheet goods and large flat panels. It holds ±0.1 mm on a good day, sometimes ±0.05 mm with a warm spindle and light cuts. If your drawing calls for ±0.005 mm, the router cannot hold it no matter how much power you feed it.
The bed is open on three sides, so the Z travel is short, often 150 to 200 mm. Deep pockets, tall fixtures and 3D contoured parts run out of room. For those jobs a vertical machining center with a 500 × 500 × 450 mm or 750 × 1,150 × 550 mm envelope is the right platform.
Power draw also tells you something about the cut. If you plan to run aluminium plate 20 mm thick all day, a 9 kW spindle router will struggle. The spindle bogs, the finish smears, and tool life falls. A 16 kW or higher machining center with flood coolant handles that work without drama.
Use the router for what it does well. Large panels, nested parts, signage, cabinet work, prototypes in MDF, plastic and thin aluminium. Move hard metal and tight tolerance work to a machining center.
How to measure and size the load in 6 steps
- 11. Read the nameplateRecord spindle kW, vacuum pump kW, dust collector kW and total machine kVA. Write them on the panel door. Do not trust a sales sheet alone.
- 22. Clamp the feederUse a true-RMS clamp meter with a 1-second peak hold. Measure each phase during a heavy cut and during spindle ramp-up. Log both running and peak current.
- 33. Convert to kWFor three-phase, kW = A × V × 1.732 × power factor ÷ 1000. Use 0.9 for power factor on a VFD-driven router. Compare this to the nameplate.
- 44. Pick the breakerSet the breaker at 1.2 to 1.5 times the measured running current. Choose a D-curve or motor-rated breaker so the spindle inrush does not trip it.
- 55. Size the cableMatch the cable to the breaker. Keep voltage drop under 3 percent over the full run. Step up one size for every 20 m beyond the first 20 m.
- 66. Verify under loadRun a 30-minute test cut in the heaviest material you plan to use. Check that the breaker, cable and panel stay cool. Re-measure and record the final numbers.
Power and feeder reference by spindle size
Figures assume 380 V three-phase and a vacuum pump running during the cut.
| Spindle | Running kW | Peak kW | Breaker |
|---|---|---|---|
| 5.5 kW | 9–12 | 15–19 | 32 A D-curve |
| 7.5 kW | 11–15 | 19–24 | 40 A D-curve |
| 9 kW | 12–18 | 22–28 | 50 A D-curve |
| 9 kW, no vacuum | 8–12 | 18–22 | 32 A D-curve |
| 9 kW, 40 m feeder | 12–18 | 22–28 | 50 A, 16 mm² cable |
| Generator supply | 12–18 | 22–28 | 40–50 kVA genset |
Frequently asked questions
Can I run a JCW 1325 CNC machine on single-phase 220 V?
Not in practice. The spindle, vacuum pump and servo drives on a 1300 × 2500 mm router expect three-phase power, usually 380 V or 480 V.
Small single-phase routers exist, but they are a different class of machine with lower spindle power and a smaller bed. Do not buy a 1325 and try to feed it from a household supply.
Does the machine draw full power when it is idle?
No. Idle draw is the control cabinet, drives fans and any running pump. Expect about 1 to 3 kW at idle if the vacuum pump is on, and under 1 kW if everything is off.
Shut down the vacuum pump and dust collector between jobs. Over a year that idle time is a real cost.
How much does it cost to run per hour?
Multiply the running kW by your local electricity rate. A 15 kW draw at 0.12 USD per kWh is about 1.80 USD per hour.
Add tool wear, vacuum filter changes and routine maintenance to get the true hourly cost. Power is usually the smaller part of the number.
Why does my breaker trip when the spindle starts?
Spindle inrush is the usual cause. The drive pulls 150 to 200 percent of rated power for a few seconds during ramp-up.
Check the breaker curve first. A C-curve or standard thermal breaker will trip where a D-curve or motor-rated breaker holds. Then check cable size and voltage drop.
Can I add a bigger spindle to raise cutting power?
Only if the machine frame, drive and spindle mount are rated for it. Upgrading a 5.5 kW machine to 9 kW usually means replacing the drive, the cable and sometimes the spindle mount.
Compare the total cost against buying a machine built for the larger spindle. On a 1325 router the retrofit rarely pays back.
Does bed size change the power draw?
Only through the vacuum pump. A larger bed needs a larger pump to hold the sheet flat, so a 1300 × 2500 mm table pulls more than a 600 × 900 mm table.
The spindle, servo drives and controls draw about the same regardless of bed size.
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