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.
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] <javascript:>> > 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] <javascript:>. > 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.
