grbl-L-Mega
LPC176x
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| grbl-L-Mega | LPC176x | |
|---|---|---|
| 2 | 1 | |
| 14 | 18 | |
| - | - | |
| 0.0 | 8.6 | |
| about 1 year ago | 3 days ago | |
| C | C | |
| GNU General Public License v3.0 or later | GNU General Public License v3.0 or later |
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grbl-L-Mega
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First aluminum project on Sainsmart 3020Pro Max
In the Grbl-L (grbl lathe version, there is also a Grbl-L-Mega version), an input pin is used to measure the spindle speed of the lathe. The same pin is used for G33 spindle synchronization threading.
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I've been retrofitting an old benchtop CNC lathe to run GRBL and cut threads! Let me know what you think.
The interface between the Teensy and Arduino is actually fairly simple. GRBL already has a built in spindle speed output using the Arduino PWM. The Teensy just reads the analog voltage from the spindle speed pin on the Arduino to set the speed. Similarly the output from the Teensy (the synchronization pulse) is just a digital pulse that gets picked up on the GRBL 'Probe' pin. Full details on the GRBL threading implementation are here. The spindle rpm should be reasonable stable under load since the Teensy is running a PID controller using the input from the encoder to keep the speed stable. This means that it can correct the rotational speed ~20 times per rotation.
LPC176x
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xPro V5 vs CNC shield vs others?
The BTT SKR is a 3D printer controller using a 32-bit LPC (Arm, baseically) micro, so it'll easily support 4 axes and have plenty of leftover power/expandabilty. The main gotcha could be spindle control, but... hm, yeah, the source indicates that they just use a heater MOSFET for spindle PWM, so it's not going to be much different from a stock 3018 controller.
What are some alternatives?
grblHAL - This repo has moved to a new home https://github.com/grblHAL
grbl-Mega-5X - 5/6 Axis version of Grbl, the open source, embedded, high performance g-code-parser and CNC milling controller written in optimized C that will run on an Arduino Mega2560
GRBL-Pendant-with-LCD - Arduino UNO or MEGA Pendant with LCD for GRBL 1.1f (Jog X Y Z and send any Command while connected to PC simultaneously)
Kernels - This is a set of simple programs that can be used to explore the features of a parallel platform.
mcmap - Pixel-art map visualizer for Minecraft. Maps are drawn from an isometric perspective.
BTT_SKR_13_14_14T_SD-DFU-Bootloader - This is a repository of BIGTREETECH bootloaders. The originals are stored under the bootloader_bin/backed_up_original_bootloaders/ directory. This repository also has a bootloader for the SKR E3 TURBO to fix the high pitch sound coming out of the CR10_STOCKDISPLAY it is located on the bootloder_bin/compiled_bootloader_bin/ directory.
uCNC - µCNC - Universal CNC firmware for microcontrollers
SKR-V1.4-Turbo-Stepper-Driver-Jumper-Configuration-Manual - SKR V1.4 TURBO Stepper Driver Jumper Configuration Manual
CNCL - Lathe grbl teach-in gui
Ender-3-Pro - Firmware source code for my Creality Ender 3 Pro