What you want should be possible, if only some one would spend some months working of the software. I use this little STMF104 for motion control (but not for CNC) and the STM32F104 can generate pulses far faster them my motors can move. What is the point of 300,000 steps per second if the motos cn't move that fast.
Most 3D printers use Marlin software that runs on an 8-bit Arduino and it runs all four axis up to the limit of the motors speed. The STM32F103 isi and order of magnitude more powerful them an 8-bit Arduino. There is not reason an STM32 can't drive a full size 5-axis milling machine. We just need someone to decide to do it. On Fri, Aug 14, 2020 at 1:21 PM cogoman via Emc-users < emc-users@lists.sourceforge.net> wrote: > > On 7/23/20 2:15 PM, Chris Albertson wrote: > > What is really needed is for someone to write firmware for the common > > STM32F103 "Blue Pill". These have the hardware to do things like step > gen > > and quadrature decode at MHz speeds and talk to the PC over SPI I2C or > USB > > and cost under $3 from 100 different vendors. I use these for motion > > control when I can but not with Linux CNC. It is really "just a > matter > > of software" but I'm not about to spend months of my time to save the > cost > > of a 7i92. > > May I suggest the shoulders of KevinOConner to stand on. > > Check > out https://www.klipper3d.org/ > > He has set up a 3D printer program that uses python on the Raspberry PI > for the G-Code interpreter. He used OctoPrint to feed the USB serial > port, but the arduino doesn't have to interpret G-Code, so with an > arduino he can max out at 102,000 steps per second, with the STM32F104 > in the Blue Pill Board he can max out at 360,000 steps per second, both > with 3 steppers stepping. > > https://www.klipper3d.org/Protocol.html > > https://www.klipper3d.org/Features.html > > The benchmark is a little cryptic to me, but I think it says the blue > pill board can step three steppers at less than 10uS per step max (for a > $3 board). If I read this properly, you can sink up 2 blue pill boards > and control 6 to 8 steppers. Yes there are limit switches connected. > It also handles the slow speed PID control of a heated bed and extruder. > > I would like to see LinuxCNC set up to control my router through the > blue pill board (or two) without needing the OctoPrint, or the Klipper3D > python interpreter. I have been running my router with GRBL, and though > it's an amazing feat of programming prowess, sometimes wrestling with > FreeCAD and either FreeCAD's PATH toolbench or JSCUT makes me wish I had > the subroutines, named variables, math, and looping constructs LinuxCNC > makes available. Many times I've spent hours or days doing something I > felt confident I could do in LinuxCNC in about an hour. > > I would like to see LinuxCNC able to control a small machine through > a $14 CNC controller. > > http://www.zyltech.com/arduino-cnc-kit-uno-r3-shield-4x-a4988-drivers/ > > The protocol and the microcontroller software is already done, though > I'd guess it doesn't use synchronous transfers, but just buffers the > steps to keep latency from stalling the steppers. > > > > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Chris Albertson Redondo Beach, California _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
