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Add Albin's notes on GRBL firmware on SC machines

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Rogier Lodewijks 2018-07-02 11:33:16 +02:00
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@ -13,4 +13,86 @@ A GRBL compatible controller for use as a drop-in replacement for the SC100 USB
- Some juper block for IO-config
Alvast een leuk plaatje:
![PCB Render](images/render2_composit_web.png)
![PCB Render](images/render2_composit_web.png)
# Stepcraft 420 CNC settings with GRBLizer
Notes kindly provided by [Albin Stigö](https://github.com/ast) on getting [GRBL v1.1](https://github.com/gnea/grbl/wiki) working with the
[GRBLizer](https://github.com/eflukx/Stepcraft-GRBLizer) board.
Tested on Stepcraft 420, but probably works with most other Stepcraft types.
## Setup
* Stepcraft 420 CNC
* Stepcraft drivers with GRBLizer board
* [GRBL v1.1](https://github.com/gnea/grbl/wiki)
* [Universal-G-Code-Sender](https://github.com/winder/Universal-G-Code-Sender)
Install GRBL in the usual way. However you need to make some changes in config.h and cpu_map.h.
```c
/* cpu_map.h */
// The Stepcraft has all limits on one pin.
#define X_LIMIT_BIT 1 // Uno Digital Pin 9
#define Y_LIMIT_BIT 1 // Uno Digital Pin 9
#define Z_LIMIT_BIT 1 // Uno Digital Pin 9
```
```c
/* config.h */
// Since all limit switches end up being shared on one pin,
// we can only home one direction at a time.
#define HOMING_CYCLE_0 (1<<Z_AXIS) // REQUIRED: First move Z to clear workspace.
#define HOMING_CYCLE_1 (1<<Y_AXIS) // OPTIONAL: Then move X,Y at the same time.
#define HOMING_CYCLE_2 (1<<X_AXIS) // OPTIONAL: Uncomment and add axes mask to enable
// The stop output of the Stepcraft board is inverted to what GRBL expects.
// However you simply can't swap the switch because the driver board will also
// disable the motors so nothing will move.
#define INVERT_CONTROL_PIN_MASK (1<<CONTROL_RESET_BIT) // Default disabled.
```
## GRBL settings
I haven't done a lot of fine tuning but these seems to work well enough.
```
$0 = 50 (Step pulse time, microseconds)
$1 = 100 (Step idle delay, milliseconds)
$2 = 0 (Step pulse invert, mask)
$3 = 0 (Step direction invert, mask)
$4 = 1 (Invert step enable pin, boolean)
$5 = 1 (Invert limit pins, boolean)
$6 = 0 (Invert probe pin, boolean)
$10 = 1 (Status report options, mask)
$11 = 0.010 (Junction deviation, millimeters)
$12 = 0.002 (Arc tolerance, millimeters)
$13 = 0 (Report in inches, boolean)
$20 = 0 (Soft limits enable, boolean)
$21 = 0 (Hard limits enable, boolean)
$22 = 1 (Homing cycle enable, boolean)
$23 = 1 (Homing direction invert, mask)
$24 = 120.000 (Homing locate feed rate, mm/min)
$25 = 900.000 (Homing search seek rate, mm/min)
$26 = 250 (Homing switch debounce delay, milliseconds)
$27 = 1.000 (Homing switch pull-off distance, millimeters)
$30 = 1000 (Maximum spindle speed, RPM)
$31 = 0 (Minimum spindle speed, RPM)
$32 = 0 (Laser-mode enable, boolean)
$100 = 133.333 (X-axis travel resolution, step/mm)
$101 = 133.333 (Y-axis travel resolution, step/mm)
$102 = 133.333 (Z-axis travel resolution, step/mm)
$110 = 800.000 (X-axis maximum rate, mm/min)
$111 = 800.000 (Y-axis maximum rate, mm/min)
$112 = 800.000 (Z-axis maximum rate, mm/min)
$120 = 10.000 (X-axis acceleration, mm/sec^2)
$121 = 10.000 (Y-axis acceleration, mm/sec^2)
$122 = 10.000 (Z-axis acceleration, mm/sec^2)
$130 = 300.000 (X-axis maximum travel, millimeters)
$131 = 420.000 (Y-axis maximum travel, millimeters)
$132 = 140.000 (Z-axis maximum travel, millimeters)
```