Used CNC Knee Mill Retrofit - Proto Trak


Work that is done on manual knee mills presents a problem.  The jobs are usually simple and required in small quantities, therefore unsuitable for production-oriented CNCs.  At the same time, making parts on manual machines is not very productive since it requires time-consuming set-ups and repetitive positioning---low value tasks for some of the most expensive people in your shop!

The ProtoTRAK has been solving this problem for more than ten years.  It has the features machinists need to save time, while avoiding the complexity normally associated with CNCs.
  • CAPABLE - it has the capability to machine arcs, diagonals, and pockets like sophisticated CNCs, eliminating the manual set-ups of rotary tables and sine plates.  Interface with off-line CAD/CAM systems enables you to run the most complicated parts.
  • FLEXIBLE - easy transition between manual and two or three-axis CNC operation as required by the task at hand.  The machinist is never stuck with doing things the "CNC way" if manual is better.
  • EASY TO USE - made for machinists to use on the shop floor without the extensive set-ups required of a production-oriented CNC.  Even a simple task like drilling holes is done quicker by eliminating the repetitive hand cranking between locations.

Applications - Thousands of shops are already using ProtoTRAKs for the two and three-axis applications shown here.

Used ProtoTRAK M2
ideal for lots of 1 to 10, where the constant attention of the machinist is required

  • TOOLING, FIXTURES - where there is a lot of machinist input in the design of the part.
  • MOLDS, DIES, EDM LECTRODES - problem solving is required during machining.
  • PROTOTYPES, MODELS - changes and modifications are anticipated.
  • MAINTENANCE, REPAIR - often with no part drawings or incomplete part specs.
  • SPECIAL MATERIALS, INVESTMENT MOLDS - constant attention is required.

Used ProtoTRAK M3
useful for lots of 10  and up, where the additional setup and programming of the Z axis is worthwhile.
  • LIGHT PRODUCTION - skilled input at first, part changing by less expensive personnel later.
  • SMALL LOTS, SECOND OPERATIONS - jobs that are marginal for an expensive machining center.
  • SOME MOLD MAKING - complex Z contouring.
  • REPEAT JOBS - for JIT inventories.
  • HOLE DRILLING, MULTIPLE PASSES - repetitive operations that can run partially attended.


Diameter Tool Compensation allows programming of the actual part rather than the center of the tool path.
Circular Interpolation makes arcs and any size hole easy to do with standard tools.
Linear Interpolation to machine diagonals at any angle.
Conrad provides automatic corner radius programming for inside or outside corners with one data input.
Incremental and Absolute programming can even be mixed within a single event.
Error Messages to identify programming mistakes.
Fault Messages for system self-diagnostics.
Program Down loading from offline CAD/CAM systems.
Mirror Image and Rotation of programmed events.
Part Graphics displayed before machining or during program run (real time).
Look a single button press to view graphics during programming.
Math Help for finding points in prompted format with graphical representation of prompts.
Teach for programming manual moves.
Machine Tool Error Compensation and Backlash Compensation custom set on your mill after installlation.
Scaling of print data.


3-Axis circular and Linear Interpolation;
3D Graphics.
Helical Interpolation.
Tool Length Offsets.


Simple Installation in your shop and on your mill.
Digital Servo Amplifiers custom designed for ProtoTRAK operation.
D.C. Servo Motors rated at 280 in-oz. continuous torque are twice that required.
Precision Ground Ballscrews in the table and saddles.
Modular Design simplifies service and maximizes uptime.
115V/60Hz/15 Amps.
Feedrate Override of programmed feedrate and rapid.
Polycarbonate Sealed Membrane Keypad and Gasket sealed Control Enclosures to lock out contamination.
9" CRT.
Built-in Floppy Disk Storage for part program.
RS232 Port for Interface with computers.


Z-Axis Ballscrew and Motor assembly
Dual Floppy Disk Drive

Specifications subject to change or modifications.

 Home   Used CNC Dual Purpose and Toolroom Mills   Used CNC Toolroom Lathes   Used CNC Knee Mill Retrofit - A.G.E.   Used CNC Knee Mill Retrofit - Proto Trak   About the distribution and manufacturers 

1998-2000  Petty-Thompson.  All Rights Reserved.