On Thu, 2010-03-11 at 05:43 -0500, Mark Wendt (Contractor) wrote: > Kirk, > > Do you have a #0 tool position? With an incremental counter > going from passing the #0 tool, just check the increment, and if it's > equal to or larger than the median go one way, and if it's smaller > than the median go the other. > > Mark
Thanks Mark. I was going to write a component in C to make the decision on direction and distance. I was thinking that there might be a C trick that might be able to do it in a line or two. I guess (X + Y)/2 = M, ?M>X, ?M<X, could be pretty short. Seb has a component (modmath) already written so I need to look at both solutions: http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?ContributedComponents#modmath_Modmath_functions_only_mod_dir_so_far (Short URL) http://alturl.com/b59n Here is my tool changer: http://www.wallacecompany.com/machine_shop/Shizuoka/00029-1a.jpg http://www.wallacecompany.com/machine_shop/Shizuoka/00030-1a.jpg (Thinking aloud) The vertical Geneva drive in the first picture has been replaced with a Bodine DC gearmotor driven by a PWM input amp. The gearmotor will drive the carousel both ways. The sprocket in the second picture will be modified to add a 4:1 gear reducer and an absolute encoder that reads 0 to 1023 then wraps between tool 24 and 1. http://www.wallacecompany.com/machine_shop/EMC2/AEAT-6010/dcp_6888.jpg http://www.wallacecompany.com/machine_shop/EMC2/AEAT-6010/ I'll need to figure out how to handle both tool number (1 - 24) and pocket location (0 - 1023). Right now, I need to build all the parts, then play with the software until it works. I think I'll calculate the direction then calculate the error between the current location and the requested location, feed this into limit2 or limit3 to get the velocity PWM signal to send to the amp. Hopefully this will bring the carousel to the requested tool and constantly correct any position errors. The limit will keep acceleration and max speed in check. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
