4-axis CNC machine controller

[Vermes]

It is a controller for CNC machines not based on a processor (controller V3).
Assumptions:

• it has to work as if it was based on a processor (half-steps, a similar frequency, the same voltage levels, etc.)
• to be simple in construction
• to be cheap to build

The controller is based on the bidirectional binary counter (4516) and demultiplexer (74HCT238), working in 3-bit mode. With these two systems, 8-bit bidirectional ring counter. By connecting by pulse diodes 1N4148, we get a half-step work. Current stabilizers are linear and their principle of operation is easy to guess from the schema.
Parameters:

• max input voltage of 24V (but at such a voltage, strong cooling would do well)
• current per phase max 1,5~2 A (linear current limiters for each phase separately, you must pay attention to maximum power of dissipation for end MOSFETs – BUZ11 and IRFZ-44N in tested were used). It is very important for the transistors to have a built-in return diode
• cooperation with all the programs that give signals of step/dir
• control voltages in TTL standard

Photos:



Schema and the board:






Link to original thread (attachment) – 4-osiowy sterownik maszyny CNC