A new CNC lathe or machining center can sit crated on the shop floor for weeks because nobody planned the power. MJK Electric handles the electrical side of machine tool installations and relocations for machine shops and manufacturers across the Phoenix metro: CNC lathes, mills and machining centers, manual lathes and knee mills, and the equipment that supports them.
Equipment We Install and Connect
- CNC lathes and turning centers
- Vertical and horizontal machining centers and CNC mills
- Manual lathes, knee mills and other conventional machine tools
- Grinders, saws, press brakes and presses
- Supporting equipment: air compressors, chip conveyors, coolant systems and dust or mist collection
What a Machine Installation Involves
- Review the machine's requirements. Voltage, phase, full-load current, breaker or fuse size and grounding requirements come from the manufacturer's installation manual and nameplate. They're often stricter than the bare code minimum.
- Check what the building has. We confirm available capacity at the panel or bus duct, the building voltage (208V, 240V or 480V), and whether three-phase service is available at all.
- Plan the power drop. A properly sized feeder, a disconnect within sight of the machine, and the right pathway: conduit, cord drop or a bus duct plug-in for shops that rearrange often.
- Match the voltage. If the machine and building don't match, we install the right step-up, step-down or buck-boost transformer. Where three-phase utility power isn't available, a properly sized phase converter may be an option, depending on the machine manufacturer's requirements.
- Ground it correctly. A dedicated equipment grounding conductor sized and terminated to the manufacturer's specification. Poor grounding is behind a lot of the "electrical gremlins" CNC controls are known for.
- Verify before power-on. We check voltage at the machine, phase balance and phase rotation, so spindles, coolant pumps and hydraulic units turn the right direction the first time they start.
- Coordinate the startup. We work with your rigger and the machine dealer's service technician so the electrical work is complete and verified when they arrive for leveling and commissioning.
208V Shop, 480V Machine?
It's one of the most common surprises in a machine purchase. Many CNC machines are built for 480V, or for a narrow voltage window around 230V, while plenty of commercial buildings in the Valley are fed at 208V. Running a machine outside its rated voltage can cause nuisance alarms, overheated drives and spindle problems. The fix is usually a correctly sized transformer installed close to the machine. We'll size it from the machine's actual load and the manufacturer's tolerance, not a guess.
Single-Phase Property, Three-Phase Machine?
Smaller shops, especially on rural properties like those around New River and outlying parts of Buckeye, often have only single-phase utility service. The options are a phase converter sized for the machines you run, or bringing three-phase service in from the utility. Converters cost less up front. Utility three-phase is usually better for multiple machines or large spindle motors, but it depends on line availability and can take time. We'll lay out both options with real numbers so you can decide.
Machine Moves and Shop Layouts
Relocating a machine within your building, or moving a whole shop, means disconnecting, labeling and safely de-energizing each machine, then reconnecting and verifying it at the new location. Phase rotation and voltage get checked again, because a different panel can mean a different result. If you're laying out a new shop, we can plan bus duct or drop locations so adding or moving machines later doesn't mean new conduit every time.
Frequently Asked Questions
Can I run a three-phase CNC machine on single-phase power?
Sometimes, with a properly sized phase converter. Whether it's a good idea depends on the machine, its spindle motor and the manufacturer's requirements. Some manufacturers specify converter types or won't support them at all. We'll check before you buy anything.
My machine is 480V but my building is 208V. What do I need?
Usually a step-up transformer sized to the machine's load, mounted near the machine, with the right overcurrent protection on both sides. We'll size it from the nameplate and the manufacturer's voltage tolerance.
Do you set and level the machine?
No. Rigging, leveling and control commissioning are handled by your rigger and the machine dealer's technician. We handle all of the electrical work and coordinate with them so the machine is ready to power up when they arrive.
How long does a machine hookup take?
It depends on what's already in place. A drop near a panel with spare capacity can be quick. A new feeder, a transformer or a service upgrade takes longer, and equipment lead times can set the schedule. Call us before the machine ships, so the power is ready when it arrives.