BobsCNC E3 Troubleshooting Manual
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BobsCNC E3 Troubleshooting Manual

Cnc router engraver kit
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Simple Cost Effective Designs.
E3 CNC Router Troubleshooting Guide
The purpose of this document is to give those new to CNC routing is a quick reference for the common
issues of getting the E3 CNC router up and running.
This guide is not complete.
Please check back from time to time. We plan
to continue to add to help you get started.
Contents
My stepper motors are running backward. .................................................................................................. 2
My Z axis is not homing correctly ................................................................................................................. 2
My E3 will not home correctly (diagnosing home switches) ........................................................................ 4
My firmware does not seem to be working .................................................................................................. 5
I tried to use Easel, now my machine does not work correctly. ................................................................... 5
I get and error when I run a g-code file made with F-engrave ..................................................................... 5
My Z stepper motor wobbles excessively ..................................................................................................... 6
My machine seems to be skipping some commands ................................................................................... 6
What are the alarm code descriptions? ........................................................................................................ 7
How do I change my current setting on the stepper motor drivers? ........................................................... 8
Setting the current on the A4899 stepper motor driver with a volt meter. ............................................. 9

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Summary of Contents for BobsCNC E3

  • Page 1: Table Of Contents

    My stepper motors are running backward....................2 My Z axis is not homing correctly ......................... 2 My E3 will not home correctly (diagnosing home switches) ................ 4 My firmware does not seem to be working ....................5 I tried to use Easel, now my machine does not work correctly..............5 I get and error when I run a g-code file made with F-engrave ..............

  • Page 2: My Stepper Motors Are Running Backward

    My stepper motors are running backward. To change the rotation of any of the E3 stepper motor you will need to flip the 4-pin connector 180 degrees. Please make sure that the main power supply is unplugged before connecting or disconnecting any stepper motor connectors.
  • Page 3 1. There is electrical noise in the Z home switch caused by the Z stepper motor wires. You can separate the home switch wire and wrap every 5 or 6 loops like in the picture. 2. Binding in the system. The stepper motors only have so much torque and cannot drive thru the binding.

  • Page 4: My E3 Will Not Home Correctly (Diagnosing Home Switches)

    The correct direction for the stepper motors during homing is toward the home switches. The Z will move up and down twice, then the X and Y axis will move. If the E3 does not home correctly it will not be in sync with the computer.

  • Page 5: My Firmware Does Not Seem To Be Working

    If the check boxes are all empty, then press and hold the switch red roller for an axis. A check box should appear in the correct axis. The home switch will need to match to the correct axis or the E3 will not home correctly.

  • Page 6: My Z Stepper Motor Wobbles Excessively

    My Z stepper motor wobbles excessively Ensure the aluminum helical coupler has space left between the helical cut to help with misalignment. The coupler can be stretched a total of 1 millimeter or 1/16” to help increase the gap between the helical cut.

  • Page 7: What Are The Alarm Code Descriptions

    The most common alarm is Alarm 2. When the E3 homes it sets limits in the firmware. These soft limits will trigger and not the machine to move past the end of travel on each axis. When the E3 is homed, the axis is set to X=0, Y=0 and Z-0.

  • Page 8: How Do I Change My Current Setting On The Stepper Motor Drivers

    How do I change my current setting on the stepper motor drivers? There are 2 styles of stepper drivers that we have for the E3. Both styles work equally well, but the current needs to be set with different values. The yellow circles denote the driver with the R200...

  • Page 9: Setting The Current On The A4899 Stepper Motor Driver With A Volt Meter

    �������� = �������� ∗ 8 ∗ �� or �������� = ��������/(8 ∗ ��) For the E3 CNC router we want the current to be around 0.9 amps. The settings would be as follows: We can set the voltage by holding the negative led to ground and the positive lead to the potentiometer...

  • Page 10: Setting The Current On The A4899 Stepper Motor Driver Without A Volt Meter

    clockwise. Setting the current on the A4899 stepper motor driver without a volt meter. While a voltmeter will give you more accurate results. The drivers can be adjusted by turning them up or down 1/8 of a turn and checking for proper movement after each setting. Stepper motor current too low –...
  • Page 11 First you will need to remove the 4 screws to the top housing and remove the covers. Use a small scewdriver to gently pull the brush springs out and lock them against the housing as shown. Brush Spring...
  • Page 12 Brush Spring Remove the brush and repeat for the other side. Motor brush...
  • Page 13 Motor brush Insert the DeWalt motor shaft.
  • Page 14 Insert on screw to hold the shaft inplace. Insert the motor brushes and place the brush spring as shown for both motor brushes.
  • Page 15 Install the back cover and place components and wires as shown.
  • Page 16 Insert the 4 screws. Remove the mounting screw and carefully continue to install the DeWalt to the E3 router mount as shown in the assembly manual.

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