> On 07 Jul 2016, at 07:26, Diego Molina <[email protected]> wrote: > > > It works beautifully, with metric units, really sweet! > > Now on to the 5th axis design to see if I can get this to full 5 axis.
Of course I'm curious, so if you've got pictures/videos when you're done, please brag about it and show us where to look! Bas > > Cheers! > > >> On Wednesday, July 6, 2016 at 4:00:35 PM UTC+4, Bas de Bruijn wrote: >> >> >>> On 06 Jul 2016, at 13:34, Diego Molina <[email protected]> wrote: >>> >>> >>> Bas, >>> >>> That's all really clarifying. I'll sit by the machine with all this new >>> information and try to sort things out. >> >> Good luck, if you run into trouble/strangeness then shout out. >> >>> >>> In the future I'll follow your advice and try not to pollute the group. >> >> Well, it is much easier these days to read the info you can provide from the >> web, where for example you can highlight a specific line of code. If you add >> a lot of text (or some people send file attachments) then the thread becomes >> very hard to read (and attachments are especially horrible opening/reading >> from mobile devices) and difficult to point at lines of code for example. >> >> So the better to the point you (or anybody else for that matter) provide >> info, the better the chance for a successful answer. >> >> Cheers >> >>> >>> Thanks, >>> >>> >>> Diego >>> >>>> On Tuesday, July 5, 2016 at 3:55:30 PM UTC+4, Bas de Bruijn wrote: >>>> >>>>> On 05 Jul 2016, at 13:27, Diego Molina <[email protected]> wrote: >>>>> >>>>> >>>>> >>>>>> On Tuesday, July 5, 2016 at 1:23:35 PM UTC+4, Bas de Bruijn wrote: >>>>>> >>>>>>> On 05 Jul 2016, at 10:56, Diego Molina <[email protected]> wrote: >>>>>>> >>>>>>> >>>>>>> Greating to all, >>>>>>> >>>>>>> So I've got a lot of cuts out of my 3 axis machine running on a BBB / >>>>>>> Xylotex configuration, now I added a 4th axis and am having trouble >>>>>>> figuring out the values to calibrate it and make it move as expected. >>>>>>> >>>>>>> I've based my config around Xylotex.ini and Xylotex.hal example >>>>>>> configs, but to arrive at the actual distances on my steppers and lead >>>>>>> screws I had to lower the scale to about 20000. All the axes work as >>>>>>> expected with those settings. >>>>>>> >>>>>>> The thing is, now I've added a 4th axis with a 20-to-1 ratio worm >>>>>>> wheel, and when I issue a G1 A90 F100 code (I'm assuming this is right >>>>>>> to ask for 1/4 turn?) >>>>>> >>>>>> don’t assume, be sure instead. Have a search thru the docs on the >>>>>> meaning of G1 A90 F100. Find out what units are used. >>>>> >>>>> Is it steps/degrees? You know, I just ask after a lot of searching, >>>>> which in this case didn't result in any clarification on the matter. >>>> >>>> look at your configuration for example >>>> https://github.com/machinekit/machinekit/blob/master/configs/ARM/BeagleBone/Xylotex/Xylotex.ShuttleXpress.ini#L122 >>>> >>>> and >>>> >>>> https://github.com/machinekit/machinekit/blob/master/configs/ARM/BeagleBone/Xylotex/Xylotex.ShuttleXpress.ini#L132-L140 >>>> >>>>>> >>>>>>> , for example, with the scale at 20000, it gives me around 10 turns on >>>>>>> the axis. When I try to decrease the scale I get to 400 and it moves >>>>>>> about right, but really slowly. I've tried to increase speeds after >>>>>>> that but without success. >>>>>> >>>>>> it all depends on the settings you use. Don’t upload your ini file here, >>>>>> but commit you hal and ini file to your repo and provide a link to that. >>>>>> We can’t see inside your head. read this: >>>>>> http://www.machinekit.io/docs/getting-help/ >>>>> >>>>> I've seen people here requesting the ini's, so I just assumed it would be >>>>> more convenient to just put as text. >>>> >>>> nope, people specifically ask to give links. >>>> >>>>> >>>>>>> >>>>>>> Could somebody please point me on which settings to edit, so my other >>>>>>> axes still work and the 4th can move at a decent speed at the right >>>>>>> rate? >>>>>> >>>>>> you need to do some calculating. find out >>>>>> how many steps per revolution your motor uses (200?) >>>>>> do you use micro stepping, how much? >>>>>> pitch of your leadscrew >>>>>> ratio of your worm (1:20) >>>>>> >>>>>> then you need to know the max amount of pulses that you can put out. >>>>>> find the step length and step time for your drivers and calculate the >>>>>> max frequency. This should give you an indication of what your motors >>>>>> and electronics can physically do. >>>>>> >>>>>> then look at the settings in your ini file for the 4th axis, and compare >>>>>> the max_velocity, mac_accelerations, stepgen_max_vel and stepgen_max_acc >>>>>> settings. >>>>> My driver is 200 steps per revolution, 6400 microstepping (pulses/rev), >>>>> the pitch is 2mm, but how would I end up knowing the amount of pulses? >>>>> Step length and step time are both 1500. >>>> >>>> calculate them. >>>> >>>> for each mm of movement, there need to be 6400 steps / 2 mm pitch with an >>>> extra ratio of your worm of i=20 so you’ll need: >>>> >>>> (6400/2)*20 steps/mm = 64000 steps/mm >>>> >>>> both step time and step length define your max frequency. Look at the link >>>> above for the example. >>>> 3 us (1500ns + 1500ns) means that your max frequency is 1 / 3us = 333.3 kHz >>>> >>>> 333333 Hz devided by 64000 steps/mm means you have 5.2 mm/sec max speed. >>>> But your BBB is probably not set up to use this steprate. This is the >>>> physical limit with your settings >>>> >>>> If you have the standard 10us task period then you’re even limited to >>>> 50kHz steprate. which means 50000/64000 = 0.78 mm/sec >>>> have a look to the first link in this search >>>> https://groups.google.com/forum/#!searchin/machinekit/max$20step$20rate$20beaglebone >>>> >>>> >>>>> >>>>> >>>>> Thanks, >>>>> >>>>> Diego >>>>> >>>>> -- >>>>> 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. >>> >>> -- >>> 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. > > -- > 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. -- 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.
