53 CNC SYSTEM  2007.9/30 

1.The following is a block diagram of my CNC system.
 It took about one year to complete the CNC addition through a trial and error process.

2.HP nx6120

It has a parallel connector and a USB interface.

3.This is screen shot of CAD/CAM software.

It is called "Nc Editor WT3NC." (Japanese Version only.)  
4.This is a screen shot of the CAM output.
5. 5. This is a screen shot of the USB CNC control software that I mainly use.

This software has an intuitive interface and is easy to program.  


6.  The USB CNC requires dedicated  hardware that is supplied by the developer.

The step pulse is output from this board.

7. I also use the MACH as a subsystem.  

The step pulses are an output from the parallel port of the computer.
8.This is the inside of the control box.

The control box includes the following boards:

Pulse Width Converter
Level Convert Interface
9. This is the front panel of the control box.

The parallel connector is for the MACH.
The Emergency STOP  button is on the right side.
A Power On indicator and Servo ON-OFF switches with LED are also included.
10. Level Convert Interface board.
The output is 5 volts, balanced.
This board was designed and produced by my friend.
11. The output pulse is very narrow and can be varied.
12. A trial run of the servo motor is shown. 
10.These are the motor driver amplifiers.

The left two are servo motor amplifiers

The middle one is a stepping motor amplifier
The right one is a stepping motor for the A axis.
11. This is an interior view of the reduction gear mechanism.
A manual handle is installed, but a clutch is included for handle movement to be OFF during CNC operations.

The reduction mechanism is not always necessary.
Direct couple system also works.
12.The mechanical limit switch is installed.

The maximum feed speed is F2500.  

The movement of this system is very stable.
Powerful, no stop, no step out.
13. Ball screws are installed  for the x-axis and y-axis.
The ball screws greatly reduce the mechanical load of the servo motors.
To me, the use of ball screws is needed to have reliable operation if a general purpose milling machine is converted to CNC.
14.Ball screws and nuts. One end has been processed.
15.The end of the ball is being machined.  The ball screws are hardened and require specialized machining techniques to produce the needed precision.  

16.Making a ball screw nut holder with the lathe because the milling machine is disassembled.
17. This is Z-Axis view.

A stepper motor is installed on the micro movement mechanism.
18.Inside view of the Z-Axis.
19.This is a view of the z-axis mechanism.

A small, shop made oldham type coupling is used.

20.One of the most impressive applications of the CNC system.
21.The rear panel holes of the control box were made with the CNC.


The following is a CNC system in the stepping motor before the current servo system is completed.
22.Stepping motors and drivers.
23.Finishing of the oldham type coupling.
24.This is my first CNC system. It consists of stepper motors and a direct drive system.

Stepper motors are much cheaper than servo motors and easier to control.

I am pleased to report that the CNC system works very well.

25.This is a view during testing of the stepper motor while it provides direct drive to the x-axis.