TRAK K3 SMX - D and R Machinery - Arizona CNC Machine Tools
TRAK K3 SMX Kneel Mill
TRAK, Knee Mill
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TRAK K3 SMX Knee Mill


The best built, best supported knee-type milling machines you can buy


  • 3 HP spindle motor
  • ProtoTRAK SMX control
  • R8 Spindle (NT30 or BT30 options)
  • Travels: Table, Saddle, Knee and Ram: 32” x 16” x 16” x 15″
  • Table size: 50″ x 10″
  • Meehanite Casting
  • Manual, 2-axis or 3-Axis CNC operation
  • Programmable spindle speeds and tapping
  • Precision ground ball screws installed in the table, saddle and column
  • Wide way surfaces that are hardened and ground, slideways are Turcite® coated.
  • Chrome ground quill



The most powerful CNC for Toolroom work!


The ProtoTRAK SMX is available as a 2-Axis CNC – 3-Axis DRO or a 3-Axis CNC 3-Axis DRO. Can be used on ProtoTRAK SMX CNC Retrofits, TRAK K3 SMX Knee Mills, or TRAK Bed Mills.

  • Easy transition between manual, 2-Axis and 3-Axis CNC
  • Always easy to learn and use – even the most advanced operations
  • Configure the control to your needs
  • Optional Parasolid and DXF Converters



Specifications for TRAK Knee Mills


ProtoTRAK CNC Model SMX Table Size 50″ x 10″
T-Slots 5/8″ x 3″ x 2-1/2″ Travel (Table, Saddle, Knee, & Ram) 32″ x 16″ x 16″ x 15″
Quill Diameter 3-3/8″” Maximum Quill Travel 5″
Spindle Taper R8 (NT30 or BT30 Options) Spindle Speed Range RPM 60 – 4200
Head Tilt 45º Forward & Back, 90º Left & Right Spindle Motor HP 3HP Continuous
Power Requirements, control 110V/1P/12 Amp Power Requirements, Machine 220V, 3P, 8.5 Amp
Maximum Weight of Workpiece 850 lbs Machine Dimensions (L,W,H) 71″ x 59″ x 84″
Machine Weight 2816 lbs Max. Rapid Feed 100 IPM

Options for Knee Mills

TRAKing/Electronic Handwheels

  • Converts the mechanical handwheels into electronic handwheels for operating the table and saddle
  • Enables the powerful TRAKing feature
  • Useful DRO features
  • Not available with the ProtoTRAK EMX CNC


  • Model DX6 6″ Kurt vise with mounting hardware

Power Draw Bar

  • A Torque-Rite draw bar factory installed
  • May be ordered as R8, CAT or NMTB/NST
  • Draw bar for CAT type is longer to fit into tool holders that have the tool changer grip, or retention knob removed

Spray Coolant

  • The non-fogging coolant sprayer directs a fine stream of coolant to the tool and workpiece


Halogen Lamp

  • Convenient light with bright, long-lasting halogen bulb

Chip Pan

Glass Scales

  • A glass scale mounted on the table and saddle
  • Not available on the ProtoTRAK EMX CNC

Remote Stop / Go Switch

  • A hand-held switch to stop and continue program run



  • Provides an enclosed work-space mounted on the table
  • The sliding door is switched to prevent operation of CNC Run with door open

Limit Switches

  • Switches and brackets to set maximum travel limits
  • Tripping the switch will cause servo motors to shut down
  • Not available with the ProtoTRAK EMX CNC

Tooling Kits

  • Available in CAT, NMTB, BT or R8

Knee Power Feed


Riser Block

  • 4″, 6″, or 8″

Automatic Lubrication Pump

  • Provides lubrication to ways and ballscrews
  • Programmable
  • Alarms in case of problems

Coolant Pump

  • Mounted inside the bed or machine column
  • A manual switch is provided when not used with Auxiliary Functions