Just to follow up: machinekit with BBB and thc works on my setup - here is video of machine in action. https://youtu.be/2oMeL6kEZrk
Dne sreda, 23. december 2015 12.58.00 UTC+1 je oseba Klemen Zhivko napisala: > > OK I understand. > My first goal is to finish machine, than I will try CRAMPS setup for 5 > axis with THC enabled. > I received CRAMPS board in the meantime. > If @Charles author of CRAMPS can assign analog pin that can be used for > THC it would be great. > If there is some shortcut to working INI and HAL files for CRAMPS that > support THC control it would be great - I would appreciate for any example > I can use so I don't need to begin from scratch.. > > On Saturday, December 19, 2015 at 8:18:09 PM UTC+1, Viesturs Lācis wrote: >> >> Then I do not understand, what is not clear to you. Yes, rotating the >> tube will require the torch to go up or down, but there are other reasons >> as well that can require to adjust torch height (material surface being >> curved, material not laying totally horizontal etc), that is why the plasma >> tip voltage is measured and the torch position is adjusted according to >> that (if the torch is too close, the voltage is lower, if it is too high, >> the voltage increases; it might be ~140-160V for 3-4 mm distance, but that >> will vary for particular plasma torch and plasma source). In this case it >> is _not important_, what are the causes. You do not need to tackle >> kinematics, simply implement standard THC functionality. One way to do that >> is the task sequence I provided. >> >> On Friday, December 18, 2015 at 9:27:26 PM UTC+2, Klemen Zhivko wrote: >>> >>> Viestrus, >>> maybe I was misunderstood - yes option 1 is the right one. >>> >>> >>> On Fri, Dec 18, 2015 at 6:08 PM, Viesturs Lācis <[email protected]> >>> wrote: >>> >>>> >>>> >>>> On Friday, December 18, 2015 at 5:40:41 PM UTC+2, Klemen Zhivko wrote: >>>>> >>>>> >>>>>> Second of all, I understand that you want basic THC functionality >>>>>> (not adding offset moves for X and Z to keep the torch tip at the same >>>>>> spot >>>>>> on tube's surface, when the rotary head is moved) and since you are >>>>>> using >>>>>> CRAMPS, I understand that you are using stepper motors. >>>>>> >>>>> Ugh, as I understand if - if THC is operating, rotating pipe (moving B >>>>> axis) should have effect on Z axis. Standoff of torch to pipe surface >>>>> (acording to my sketch) is measured in Z direction. >>>>> >>>> >>>> THC description clearly says that it adjust torch height according to >>>> plasma tip voltage - either you did not read it or I do not understand, >>>> what exactly do you want. Which one of these 2 options? >>>> 1) adjust Z position, based on plasma tip voltage, aka standard THC; >>>> 2) adjust Z (and X as well) position to keep plasma torch tip on the >>>> same spot on the square (rectangle to be more precise) tube surface as >>>> rotary head is turning; >>>> >>>> -- >>>> website: http://www.machinekit.io blog: http://blog.machinekit.io >>>> github: https://github.com/machinekit >>>> --- >>>> You received this message because you are subscribed to a topic in the >>>> Google Groups "Machinekit" group. >>>> To unsubscribe from this topic, visit >>>> https://groups.google.com/d/topic/machinekit/jTE2p9Jc6Fo/unsubscribe. >>>> To unsubscribe from this group and all its topics, send an email to >>>> [email protected]. >>>> Visit this group at https://groups.google.com/group/machinekit. >>>> For more options, visit https://groups.google.com/d/optout. >>>> >>> >>> -- website: http://www.machinekit.io blog: http://blog.machinekit.io github: https://github.com/machinekit --- You received this message because you are subscribed to the Google Groups "Machinekit" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. Visit this group at https://groups.google.com/group/machinekit. For more options, visit https://groups.google.com/d/optout.
