3D Line to Stepper Axis Pulses in a
Stepping Motion Profile
in Realtime by veggiepete
Code for Arduino and Raspberry Pi with nice acceleration curves and turn prediction. The Arduino is only there to provide precise timing for the step and direction pulse data produced by the Pi. Motion is smooth and fluid because the entrance and exit speed of each movement segment is taken into account. E.g. A 90' turn needs a full stop, but a 1' turn doesn't need to slow down at all.+
This RepRap firmware is a mashup between Sprinter, grbl and many original parts.+
LeibRamp was developed in 1994 by Aryeh Eiderman and is said to be the "World's
fastest ramping (motion profile building) algorithm." On this page,
Eiderman provides an overview of the math involved in calculating pulses
per timer tick, for slew, and ramp acceleration / deceleration.
http://www.hwml.com/ is an NXP LPC2136/01
based USB to 4 axis embedded motion controller in a DB25 backshell.
Demo program for stepper motor control with linear ramps. Hardware: PIC18F252,
L6219. The discussion of the method and the math behind it may be found here:
Open source, Java G code to intermediate format, PIC firmware 2axis coordiantion
with seperate Z axis movement. No acceleration.
G code to propriatary format in PC software $100 then by USB to 4 axis motion
control hardware $15 for the PIC chip, $15 for the PCB and about $15 shipping.
The PIC firmware does NOT actually process G code.
http://forums.reprap.org/read.php?12,9459 Arduino G code
to stepper. See user.cpp file.
https://github.com/simen/grbl Grbl is a free, open source,
high performance CNC milling controller written in optimized C that will
run on a straight
a shield is available
Another mill with firmware based on the reprap.
MicroBasic pic18f4620, SD-MMC card, KS0108 graphic LCD. Direct G code to
movement. Bugs in circles but can be avoided. Clunky source.
Very simple design that works for drilling.
Some notes about smoothing motion.
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<A HREF="http://piclist.com/techref/io/embeddedCNCs.htm"> Firmware / Embedded Microcontroller based Computer Numerical Control</A>
PICList 2013 contributors:
List host: MIT,
Site host massmind.org,
Top posters @20130525 RussellMc, IVP, veegee, Bob Blick, alan.b.pearce, John Gardner, Sean Breheny, Isaac Marino Bavaresco, Carl Denk, Josh Koffman,
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