Arduino CNC Shield Instructions

ZYLtech MK8 Full Metal Extruder

2004 LCD 3D Printer Smart Controller

Zyltech TOSHIBA TB6600 Driver Instructions

ZYLtech MK8 Full Metal Extruder

2004 LCD 3D Printer Smart Controller

Zyltech TOSHIBA TB6600 Driver Instructions

In order to make sure all your parts function properly, we need to go through a pre-flight checklist prior to the first run.

he orientation of stepper drivers. Please note the potentiometer (pot) on A4988 and DRV8825 are at the opposite side

Please note locations of potentiometer on A4988 and DRV8825

2. Plug the shield into an Arduino board and load the GRBL Firmware following the steps bellow:

Please note: there are problems reported for the new v1.1, the older version is recommended.

Unzip the download and youll have a folder called grbl-master

Launch the Arduino IDE. (Please make sure you are using the most recent version of the Arduino IDE.)

Load GRBL into the Arduino IDE as a Library. (Click the Sketch drop-down menu, then navigate to Include Library, and select Add .ZIP Library)

which only contains the source files and an example directory. (If you accidently select the .zip file or the wrong folder, you will need to navigate to your Arduino library, delete the mistake, and re-do this step.)

Open the GrblUpload Arduino example. (Click the file down-down menu, navigate to Examples-Grbl, and select GrblUpload)

Compile and upload GRBL to your Arduino. (1.

Connect your Arduino Uno to your computer. 2.

Make sure your board is set to the Arduino Uno in the Tool-Board menu and the serial port is selected correctly in Tool-Serial Port. 3. Click the Upload and GRBL should compile and flash to your Arduino!

flashing with a programmer also works by using the Upload Using Programmer menu command.)

You may also get official instructions and files for loading the GRBL Firmwarehere.

3. Open up a serial connection to the Arduino board and check ifGRBLis running. (We use Universal G-code sender to connect to GRBL)

4. A4988 stepper drivers need adjustment for reference voltage. We will cover that in detail later.

Testing each stepper controller socket individually is critical.

Make sure the external high voltage power is not powered-up or connected

Connect a stepper motor to the stepper controller socket you want to test. This is very important because the Pololu Stepper drivers are designed to ramp up the current until it reaches the needed current to run.

Without a stepper motor connected there will be nothing to consume the current and you can end up damaging the stepper driver if it over-heats in the process.

Next, install the stepper motor driver ensuring that the enable pin on the driver aligns with the enable pin on the shield.

Connect the external power to the shield, making sure you connect the power up the right way.

If not connected correctly you can cause damage to the shield, stepper motor drivers and Arduino board

Send a g-Code to the Axis you are testing. The stepper motor should move if everything is working. (GCode Example : G1 X5? or G1 X0? or G1 Y5?)

Repeat the above process with each axis using the same stepper driver.(Testing with one driver reduces the risk of damaging multiple stepper drivers at the same time.)

6. After all the above have been checked connect all the drivers and power up the system.

Current Limit (Reference Voltage) Adjustment for Stepper Driver

A4988 sold by Zyltech, Rs=0.1 ohm. Thus the max current is Vref/0.4

Reference voltage is adjusted with a small screwdriver at the point indicated with the white arrow in the picture to the right. We suggest adjusting the reference voltage in small increments – no more than a quarter turn at a time. For a starting point, you may set the max current to 1A. If the motor over heats, reduce the Vref. If the motor does not move or miss steps, increase the Vref.

Using two jumpers the 4th axis can be configured to clone the X or Y or Z axis. It can also run as an individual axis by using Digital Pin 12 for Stepping signal and Digital Pin 13 as direction signal. (GRBL only supports 3 axiss at the moment)

Clone X-axis to the 4th stepper driver (marked as A)

Clone Y-Axis to the 4th stepper driver (marked as A)

Clone Z-Axis to the 4th stepper driver (marked as A)

Use D12 and D13 to drive the 4th stepper driver (marked as A)

Configuring Micro Stepping for Each Axis

Each axis has 3 jumpers that can be set to configure the micro stepping for the axis.

*In the tables below high indicates that a jumper is inserted and low indicates that no jumper is inserted.

By default GRBL is configured to trigger an alert if an end-stop goes low (becomes grounded.) This has been debated and some people have requested to have active high end-stops. The jumpers in the picture above provide options for both. The left image indicates the connection required to run with the default GRBL setting. (This Jumper was only introduced in Version 3.02)

End-stop switches are standard always open switches. An end-stop is activated when the end-stop pin connects to ground (when setup with default GRBL settings.)

The end stop switches that come with the ZYLtech kit have three wires. Such end stops are easy to use, monitor and install, especially compared to the bare mechanical switches. However, the CNC shield only provides 2 PIN headers in contrast to the RAMPS shield. There are two ways to install the end stops:

1. Leave the red wire unconnected and use it as normal open (NO) end stop

2 . Add a +5V power to the red wire and take advantage of LED indicator on board

Wiring ZYLtech Nema 17 stepper motors is simple. Plug in the connectors to the headers for each axis.

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