Milling Machine CNC 3503  (Discontinued) 

Milling Machine CNC
  • Complete factory-built CNC milling machine
  • 1-1/3 Horsepower spindle motor drives R8 spindle
  • Electronics are built in to the machine
  • Fourth axis driver included at no extra charge
  • Includes fully-licensed copy of Mach3 software
Part Number: 3503  (Discontinued)
Weight: 594 lb

Price: $6,495.00

The model 3503 CNC Milling Machine is a complete CNC solution. It’s not a conversion or adaptation; this machine is designed and built by the factory as a CNC machine.

Up until now, hobby CNC has required that you make or buy a conversion of a manual milling machine. You had to integrate the mill, ball screws, stepper motors, drivers, power supplies, and breakout boards. Most people don’t even know what those things are, much less how to integrate them into a working CNC machine.

The model 3503 is the perfect mill for the bench top machinist who wants to create parts and not just build a CNC machine. The power supplies and controllers are built into the mill. No extra cabinets, cables, or connectors are required. Add the optional model 3616 computer and you have a complete CAD/CAM/CNC package with fully-licensed software. The model 3503 CNC milling machine even includes a 4th axis driver so you can add a 4th axis rotary table by simply plugging it in.

With powerful NEMA 34 hybrid stepper motors connected by zero backlash jaw couplings to precision-ground ball screws, the model 3503 can achieve positioning accuracy to 0.0005". Not many hobby-grade machines can make a claim like that. It will machine at up to 20 inches per minute and rapid traverse at up to 80 inches per minute.

The model 3503 offers industrial-grade features such as rigid way covers on the horizontal axis. All of the dovetail ways and ball screws are completely covered. A one-shot oiler with flexible shielded lube distribution tubing takes care of daily lubrication with a single press of a lever.

A 1.3 horsepower closed loop brushless DC spindle motor and synchronized belt drive takes the spindle from 100 to 5000 rpm under full CNC control. That’s enough power for a face mill up to 2.5 inches in diameter.

With a work envelope of 11.2" (X-axis) × 4.7" (Y-axis) × 10.6" (Z-axis) the model 3503 has the capabilities to do real work. And at 443 pounds, you know it is not a toy. The mill table is 21.50" × 6.30", giving you plenty of room to mount your work and fixtures.

The coolant catch tray on the table and the pan under the machine make the use of flood coolant practical. A software controlled receptacle on the back of the machine provides CNC control of the optional coolant pump.

And we haven’t forgotten your safety. The model 3503 carries the CE marking, the European counterpart to UL listing. A safety E-stop button right on the front and the interlocked spindle shield shut down the mill instantly.

The model 3503 CNC Milling Machine is a version of the SIEG KX3.

Chris Chris' Tips
Come to our showroom in Pasadena California for a demonstration of this machine. Give us a call at (800)981 9663 so we can be ready for you.

Here's a printable 3503 CNC Milling Machine Data Sheet.

A question we get a lot is What software do I need to run a CNC mill?

  • 11.2" × 4.7" × 10.6" work envelope
  • Class 5 precision hardened and ground ball screws
  • Direct drive NEMA 34 hybrid stepper motors
  • Zero backlash jaw couplings
  • Three stepper drivers for X,Y, and Z axes
  • Extra stepper driver for 4th axis pre-wired with external socket
  • Variable spindle speed under full CNC control
  • Synchronous belt spindle drive (no gears)
  • Limit switches and homing on all three axes
  • Parallel interface board optically isolates the machine from the computer
  • Fully covered ways and ball screws
  • Emergency e-stop switch and chuck guard switch
  • CE marking (comparable to UL listing)
  • CNC controlled coolant pump receptacle
  • Coolant catch tray on the table and coolant catch pan under machine
  • Power supply and control system are integral to the machine.
  • One shot oiler with flexible shielded lube distribution tubing
  • Industrial grade ABEC 5 angular contact and ball spindle bearings
  • Dovetail slides with adjustable gibs
End Milling Capacity 0.6" (16 mm)
Face Milling Capacity 2.5" (63 mm)
Drilling Capacity 0.6" (16 mm)
Table Size 21.6" x 6.3" (548 mm x 160 mm)
T-slots 3 slots 0.47" (12.0 mm) wide
X-Axis Travel 11.2" (285 mm)
Y-Axis Travel 4.7" (120 mm)
Z-Axis Travel 10.6" (270 mm)
Throat 7.9" (200 mm)
X- and Z-Axis Ball Screws 20 mm (0.79 in) dia. x 4 mm pitch
Y-Axis Ball Screw 14 mm (0.55 in) dia. x 4 mm pitch
X-Axis & Y-Axis NEMA 34 Motors 566 oz-in (4.00 Nm)
Z-Axis NEMA 34 Motor 850 oz-in (6.00 Nm)
Positioning Accuracy 0.0004" (0.010 mm)
Spindle Taper R8
Drawbar Thread 7/16"-20
Spindle Motor 1.34 hp (1000 Watts)
Spindle Speed 100 - 5000 RPM
Spindle Torque at 1500 RPM 779 oz-in (5.50 Nm)
Power Requirements 120 V 60 Hz 15 Amps
Coolant Pump Receptacle Cap. 120 V 60 Hz 5 Amps
Feed Speed Maximum 20 in/min (500 mm/min)
Rapid Travel Maximum 79 in/min (2000 mm/min)
Machine Weight 443 lbs (201 kg)
Overall Dimensions (W x D x H) 33.7" x 34.4" x 37.8" (855 mm x 875 mm x 960 mm)
Shipping Weight 572 lbs (260 kg)
Shipping Dimensions (W x D x H) 40.2" x 39.4" x 44.1" (1020 mm x 1000 mm x 1120 mm)
One-shot oiler One shot oiler makes daily lubrication easy.
Way covers All ways are fully covered, with rigid way covers on the horizontal axis.
Ball screw Class 5 hardened and precision ground ball screws.
Stepper motor Direct drive NEMA 23 hybrid stepper motors with zero backlash jaw couplings.

You need a computer to drive the CNC milling machine. You can get the model 4244 Machine Controller, or you can use your own computer. The computer must meet these minimum requirements:

  • 2-GHz CPU
  • 1 GB memory
  • 20-GB hard drive
  • Windows XP, 7, 8, or 10
  • 32-MB video card
  • USB port (to connect to mill)
  • Front USB port (for USB flash drives for moving files)
  • DVD/CD-ROM drive 

We do not support the use of notebook computers because the power-saving features affect the functioning of Mach3.

The CNC milling machine ships by truck. Give us a call at (800)981 9663 and we will provide a firm quote for the cost of shipping.

To give you some idea of the cost of shipping this machine, here are a few example rates from April 2009. Note that freight rates are constantly changing with the cost of fuel.

Sacramento CA $132
Dallas TX $137
Chicago IL $173
Hoboken NJ $227
Miami FL $235

These rates are for delivery to a commercial address with a loading dock or a fork lift. You can also pick the machine up at the trucking company's nearest terminal.

Delivery to a residential address typically adds $45, and unloading with a lift gate adds about $75. So most home deliveries will add about $120 to the rates in the table above.