Improved collet for the 3018 CNC
The ER11A extension holder fits the 5mm motor shaft. The fit is quite tight see below.
To fit the ER11A, I wrapped the spindle motor in a plastic bag and put it in a freezer over night. I then heated up the collet in an oven at about 200 degrees centigrade for approximately 20 minutes. Then using heatproof gloves and a wooden block I tapped the ER11A extension holder onto the motor shaft.
PCB mill set https://ebay.to/2BUIHu8 (Ebay UK)
How to change Axis that are inverted – Grbl 0.9
$3 – Direction port invert mask:binary
This setting inverts the direction signal for each axis. By default, Grbl assumes that the axes move in a positive direction when the direction pin signal is low, and a negative direction when the pin is high. Often, axes don’t move this way with some machines. This setting will invert the direction pin signal for those axes that move the opposite way.
This invert mask setting works exactly like the step port invert mask and stores which axes to invert as bit flags. To configure this setting, you simply need to send the value for the axes you want to invert. Use the table above. For example, if want to invert the Y axis direction only, you’d send $3=2 to Grbl and the setting should now read $3=2 (dir port invert mask:00000010)
Example: send $3=5 from the command console to invert the x and z axis.