> On 16 Feb 2020, at 2:08 pm, John Dammeyer <jo...@autoartisans.com> wrote:
>
>
>>>>
>>>> It is for a plasma cutter configuration, stepper motors for the axes and
>>>> LinuxCNC doing the torch height control.
>>>>
>>> Totally get that. Wouldn't want a tool like I'm proposing on a 3D printer
>> either.
>>> John
>>
>> This is just one instance where LinuxCNC with it's flexibility really shines.
>>
> Recall I've never said anything about getting rid of LinuxCNC as a trajectory
> planner nor user interface with tool path display etc.
>
> But isn't a plasma cutter a lot like a 3D printer? Especially one that uses
> a touch probe to map the surface and tweaks the Z axis so the plastic ends up
> flat. I use OctoPi to interface to mine. But that's only as something that
> pulls serial data from the USB port and repackages it as a web page on my
> laptop in another room.
No, the torch voltage is read every servo period then if the voltage is outside
the defined voltage then the Z axis is adjusted until the torch voltage is back
to the target voltage
>
> And when it comes to 3D printing where's the push to replace all those
> Arduino's and Pi interfaces with a PC and a full keyboard, mouse and screen?
> After all wouldn't they work so much better if they were running LinuxCNC?
I don't recall anyone saying that LinuxCNC would be "better" at running a 3D
printer than anything else. I used to use Octopi for my 3D printer but now I
use DuetWiFi. I still communicate with the DuetWiFi from a PC and a full
keyboard, mouse and screen
>
> So although in the case of the lights out behaviour of my 3D printer I could
> (and have) put the laptop right beside the printer and used OctoPi to do
> other setup or control stuff. But for the most part I'm not near it. The
> camera on the Pi2 provides the feedback I need. And I'm not suggesting this
> for a milling machine or a lathe.
I wouldn't leave a 3D print going without me being in the same room, that is
just a personal preference. I am paranoid about a runaway heater...
>
>
> But my point is I use the stupid little 5 button array to navigate through a
> set of annoying menus to turn on the heater bed, heater, load filament, home
> it, calibrate on the corners etc. And then I could load the G-Code file from
> the SD card and start printing. But I prefer the the OctoPi interface which
> is really in some ways like the AXIS Interface for LinuxCNC.
I have no controls on my 3D printer, I used to have a stupid little 5 button
array to navigate through a set of annoying menus to turn on the heater bed,
heater, load filament, home it, calibrate on the corners etc. but as you say
that is stupid.
>
>
> I just think that when we talk about LinuxCNC nowadays we're not really
> talking about LinuxCNC anymore. We're talking about A PC with the LinuxCNC
> software connected to some sort of sophisticated FPGA/Processor board which
> has things like the stepping engine off loaded to it. And this external card
> may or may not also be the BoB.
I would hardly call a parallel port sophisticated, that is what runs my mill
and one of my lathes.
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