John, you raise a good point here. The general assumption is that the S word is a reasonable prediction of spindle speed. What do you think of having a check at both interp time and runtime? That would cover all cases. For machines like yours, we could suppress the interp-time error. Is there an INI or HAL setting to tell LinuxCNC that the spindle is manually controlled?
On Mon, Jan 23, 2017, 9:46 AM John Kasunich <jmkasun...@fastmail.fm> wrote: > > > On Sat, Jan 21, 2017, at 04:28 AM, John Morris wrote: > > > > I also thought of these three possible intended scenarios pointed out in > > this thread, and can think of valid arguments for each, briefly: > > > > 1. The manual says it's an error, and it's up to the user to avoid it > > (status quo) > > 2. The controller detects the condition, and informs the user > > 3. The controller detects the condition, and compensates by adjusting > > spindle speed > > #3 is impossible for machines where spindle speed is not controlled by > LCNC. > For example my lathe has only M3/M5. Single phase motor controlled by > contactor, with manually changed belts to the spindle. > > #2 is possible during actual program execution - can't do G33 without a > spindle encoder, and if you have an encoder, you have spindle speed > feedback and can decide if the speed is OK. > > But #2 may not be possible during generation of the preview. During > preview the spindle is not running. The only thing LCNC can do is assume > that the spindle speed will be whatever the most recent S-word specified. > But on a machine like mine, the S-word doesn't actually control anything. > IF the programmer is disciplined enough, he can use the S-word to tell > LCNC how fast he intends to run the spindle. But LCNC can't rely on that > being the actual spindle speed. > > > -- > John Kasunich > jmkasun...@fastmail.fm > > > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, SlashDot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-developers mailing list > Emc-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-developers > ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
