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Re: [Emc-users] Machmaker USB -> Parallel
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From: Bari <bar...@gm...> - 2020-08-15 07:04:20
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Honestly asking, why spend the time? Did a PC abuse people in any way during the 00's or maybe the 90's? The Orange Pi is generating steps >400Khz and runs LCNC for cheap and is not a PC. I'm looking for pathology to support a theory for anti-x86 PC machine control sentiment. What am I missing here? Is this anything more than PC bad and micro-controller good? On 8/14/20 11:57 PM, Chris Albertson wrote: > 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...@li...> 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...@li... >> https://lists.sourceforge.net/lists/listinfo/emc-users >> > |
