This is a general problem that applies not just to CNC machines. What to do if the human interface allows a human to tell a machine to do something it can't do? In this case the interface allows you to command the axis to move faster then it can. The best design is to prevent this. You'd need to have some kind of force feedback, a torque or brake applied to the command wheel to prevent you from turning it to fast. Cheaper solution is a big red LED that lights up as you approach 90% of the maximum speed. Or in place of the LED a vibrator motor to shake the wheel.
In any case, I think it is always a design error if an interface accepts commands that cannot be executed and gives no user feedback. In that case the interface is broken by a design error. Best case is that it is logically impossible to over drive the machine with the interface. Maybe an example of this is that a control wheel can always be rotated at any speed but the position of the wheel is indicated by an LCD numeric display above the wheel that shows where the actual position the machine is really at. (some microwave timers and radio tuner dials work this way A more general idea is the concept of "correctness". There are at least two levels 1) given correct input the computer produces correct output and 2) in addition to #1 above, given incorrect input the computer does not produce incorrect output. Level #1 is usually easy to implement but for most real-world systems you need #2 even if it is much harder to implement. I think what you have is a level 1 correct controller. On Tue, May 17, 2016 at 9:05 PM, Todd Zuercher <zuerc...@embarqmail.com> wrote: > If the problem is that your able to turn the handwheel fast enough to exceed > the maximum velocity for the axis and build up a store of pulses. Perhaps > you should consider limiting the step size generated by the handwheel to one > small enough that it is not possible to easily over run the max velocity of > the axis. I have seen similar behavior even in large expensive commercial > machines with Fanuc controls. Granted you have to turn the wheel really > fast, faster than you can sustain for a long enough period to build up a > significant overrun but it is detectable. > > ----- Original Message ----- > From: "Forum Deswysen" <forum.deswy...@gmail.com> > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > Sent: Tuesday, May 17, 2016 9:22:53 AM > Subject: Re: [Emc-users] Linuxcnc and Arduino > > I have a XHC - HB04 Wireless MPG during LinuxCNC HAL module. > If I turn the crank too fast I have a time delay ??? > > It's dangerous > > 2016-05-17 11:21 GMT+02:00 Forum Deswysen <forum.deswy...@gmail.com>: > >> Hi Andy, >> >> With a python script and the serial port : >> >> https://www.youtube.com/watch?v=flajZMff28U >> >> https://ckcnc.wordpress.com/basic-arduino-emc-howto/python-emc-module/ >> >> With arduino, today I 'm testing my order for tool change turret. >> It works fine >> >> >> @+ >> >> Pierre >> >> 2016-05-16 23:48 GMT+02:00 andy pugh <bodge...@gmail.com>: >> >>> On 16 May 2016 at 15:03, Forum Deswysen <forum.deswy...@gmail.com> wrote: >>> > The reaction speed is the same as a button on a Parport entry? >>> >>> That rather depends on how the Arduino connects to LinuxCNC, but the >>> answer is likely to be that it won't be anywhere near as fast. >>> >>> >>> -- >>> atp >>> "A motorcycle is a bicycle with a pandemonium attachment and is >>> designed for the especial use of mechanical geniuses, daredevils and >>> lunatics." >>> — George Fitch, Atlanta Constitution Newspaper, 1916 >>> >>> >>> ------------------------------------------------------------------------------ >>> Mobile security can be enabling, not merely restricting. Employees who >>> bring their own devices (BYOD) to work are irked by the imposition of MDM >>> restrictions. Mobile Device Manager Plus allows you to control only the >>> apps on BYO-devices by containerizing them, leaving personal data >>> untouched! >>> https://ad.doubleclick.net/ddm/clk/304595813;131938128;j >>> _______________________________________________ >>> Emc-users mailing list >>> Emc-users@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/emc-users >>> >> >> > ------------------------------------------------------------------------------ > Mobile security can be enabling, not merely restricting. Employees who > bring their own devices (BYOD) to work are irked by the imposition of MDM > restrictions. Mobile Device Manager Plus allows you to control only the > apps on BYO-devices by containerizing them, leaving personal data untouched! > https://ad.doubleclick.net/ddm/clk/304595813;131938128;j > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > > ------------------------------------------------------------------------------ > Mobile security can be enabling, not merely restricting. Employees who > bring their own devices (BYOD) to work are irked by the imposition of MDM > restrictions. Mobile Device Manager Plus allows you to control only the > apps on BYO-devices by containerizing them, leaving personal data untouched! > https://ad.doubleclick.net/ddm/clk/304595813;131938128;j > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users -- Chris Albertson Redondo Beach, California ------------------------------------------------------------------------------ Mobile security can be enabling, not merely restricting. Employees who bring their own devices (BYOD) to work are irked by the imposition of MDM restrictions. Mobile Device Manager Plus allows you to control only the apps on BYO-devices by containerizing them, leaving personal data untouched! https://ad.doubleclick.net/ddm/clk/304595813;131938128;j _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
