In bellow's picture, there is a general view of Engraver which I made in the last summer. Couple years ago 

 I started to build up a PCB drilling machine, driven by a PC. At the beginning I wrote a small driver BASIC  

 program, and that time was enough for me. After a while I thought that, I need one Engraver, for creating   

 PCB...      

 Last summer I discovered a free and very good program for driving an Engraver machine at ....        

 So...  

 I begun to develop one system to match software requirements (otherwise it's very flexible and allow you to   

 do a lot). The machine currently is 3 axis, with an X and Y range of around 300mm each and a Z range of  

 around 30mm. Stepper motors drive each axis, with 3 geared down 7.5degree ALVO stepper motors   

 "rescued" from old dot matrix printers. 

For mechanical construction, I used two old dot-matrix printers (physically almost new) . I bought those printers from second-hand market, for only 5 $ both of them. 

Stepper motors from old fashioned dot-matrix printers are cheap and have enough power to be a good solution for one Engraver machine.

I tested different type of electronic drivers for stepper motors. In following pages I will describe some of them.