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CNC V3.2.2 - SIMATIC IOT2020 and bipolar stepper motors

About CNC v3.2.2

Mechanics of CNC router v3.2.2
Figure 1:
The development of CNC v3.2.2 is sponsored by Siemens and RS Components. This machine will be displayed on the Maker Faire on May 25-27, 2018 in Berlin at the stand of Siemens.
The frame of CNC v3.2.2 is mostly composed of 19mm chipboard as an option to the steel frame of CNC v3.2.1. The wooden frame is cheaper and simpler to build.
The motors I am using are bipolar stepper motors to get an option for the electronics as well. The central brain is a SIMATIC IOT2020. I am running the "Apache" webserver on the IOT2020 to control the machine through a graphical user interface and an adopted version of grbl to implement G code functionality.

Parts list

This CNC originates from a cooperation with RS-Components which is why links in the table point to their online shop.

Part Pieces RS Components Remark
SIMATIC IOT2020 1 124-4037  
Siemens SITOP PSU100S 1 776-7738 12V 14A output
RS Pro hybrid stepper motor 1.33A at 2.8V 1 535-0467  
MIKROE-1926 Development Board for A4988 1 136-0748 Max. 2A phase current
Chipboard Approximately 4m2   Plan will be published, soon.
Aluminum square tubes 20x20x1000mm, 2mm wall thickness 18   Steel square tubes are an option.


This machine is under construction. The documentation will grow as the machine does - stay tuned!


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