On Sat, Oct 27, 2018 at 8:26 PM Gene Heskett <ghesk...@shentel.net> wrote:
> On Saturday 27 October 2018 19:23:58 Chris Albertson wrote: > > > Sorry, I've never knowingly touched an arduino, so I know pretty close to > zip about them. The speed specs have never impressed me. OTOH, one per > axis could probably get the job done. > An actual Arduino is almost obsolete. The $2.25 STM part I linked to can run circles aroubd it at 1/8th the cost and space. They are 32 bit instructions and the chip runs at one asembly language instruction per clock cycle ad this one goes abut abuot 80MHz. The run the ARM instruction set. But as slow asthe Arduino is almost all 3D printer use it as their controller. A 3D printer has have 4 axis (x, y, z, and e. where "e" is the expruder) and thse little printer move much faster then any mill. And there is a Arnuino that reads the g-code and pushed the stepper motors. But some are now moving on to STM32 ARM chips. They are easier to use. But in any case one can certainly red g-code and do software stepping on 4 axis and make the machine move at 240 inches persecond using this littel Arduino as a machine controller but I would not recommend it for new designs > > The first program I ever wrote, in assembly on an rca cosmac board had a > machine cycle of 8 cycles of a 1.79 MHz clock. I remember that chip. The new systems are dramatically easier to program. I got into programming fist in IBM mainframe computers like the s/360 and then last foubd out about micocomputers at about the time the z80 came out inthe late 1970's The Arduino IDE wa designed so that non-programers, childrem and artest could make computer controlled devices. It is purposly set up to by very easy to use. It is a good entry point and works for manythings but you can do more it you move up the ladder a step and use a development system that suports a real-time OS. > > > But you do get better use of them using ARM's MBED IDC which is only > > a baby step above Arduino. > > I'm not sure how one would go about synching a rack of arduino's taking > orders from LCNC, as all the precision is in linuxcnc. The way they do it is place the PID velocity loop on the micro controller and then update the commaned speed at what we call the servo rate. The micro sends positionand volocuty data back at the sae rate. The position pid loop is in a central controller. -- Chris Albertson Redondo Beach, California _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
