Re: [Emc-users] Carousel Jogging
this is intresting i will keep watch, as i too would like this for when i sort my turret on the chnc to jog it home if it gets stuck etc. have you done a following error check on the carousel so if it gets stuck u can automaticly stop it with out braking something etc? http://www.linuxcnc.org/component/option,com_kunena/Itemid,20/func,view/catid,30/id,14077/lang,english/ rob -- The demand for IT networking professionals continues to grow, and the demand for specialized networking skills is growing even more rapidly. Take a complimentary Learning@Cisco Self-Assessment and learn about Cisco certifications, training, and career opportunities. http://p.sf.net/sfu/cisco-dev2dev ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Carousel Jogging
On 21 October 2011 06:58, Kirk Wallace kwall...@wallacecompany.com wrote: The PID sees a position change and moves during the counter synchronization. You probably need to disable the PID during the synch. Possibly using an inverted oneshot on the edge (or maybe something else entirely) -- atp Torque wrenches are for the obedience of fools and the guidance of wise men -- The demand for IT networking professionals continues to grow, and the demand for specialized networking skills is growing even more rapidly. Take a complimentary Learning@Cisco Self-Assessment and learn about Cisco certifications, training, and career opportunities. http://p.sf.net/sfu/cisco-dev2dev ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Carousel Jogging
On Fri, 2011-10-21 at 13:06 +0100, andy pugh wrote: On 21 October 2011 06:58, Kirk Wallace kwall...@wallacecompany.com wrote: The PID sees a position change and moves during the counter synchronization. You probably need to disable the PID during the synch. Possibly using an inverted oneshot on the edge (or maybe something else entirely) I tried the Set Home button first, which simply put encoder.0.reset and encoder.1.reset on a pyvcp button. What happened was one encoder would reset a significant time latter than the other. PID would either see the position or the command change and try to fix it. I added the amp (pwm actually) enable button to disable the motion while the resets settle, which works fine, except for the need for the manual button and PID would wind up in some cases. For switching the MPG to/from Carousel, the problem is very similar, the command and position need to change and sync on entering and leaving Carousel. I suppose it would be easier to just write a component that uses if/case to keep track of ATC status, but I thought I would try to build it with existing components first. I just don't have my brain around using components in an if/case fashion. Too many spinning plates for me: http://www.youtube.com/watch?v=Zhoos1oY404 -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA -- The demand for IT networking professionals continues to grow, and the demand for specialized networking skills is growing even more rapidly. Take a complimentary Learning@Cisco Self-Assessment and learn about Cisco certifications, training, and career opportunities. http://p.sf.net/sfu/cisco-dev2dev ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Carousel Jogging
On 10/21/2011 09:02 AM, Kirk Wallace wrote:
I tried the Set Home button first, which simply put encoder.0.reset
and encoder.1.reset on a pyvcp button. What happened was one encoder
would reset a significant time latter than the other. PID would either
see the position or the command change and try to fix it. I added the
amp (pwm actually) enable button to disable the motion while the resets
settle, which works fine, except for the need for the manual button and
PID would wind up in some cases. For switching the MPG to/from
Carousel, the problem is very similar, the command and position need
to change and sync on entering and leaving Carousel. I suppose it
would be easier to just write a component that uses if/case to keep
track of ATC status, but I thought I would try to build it with existing
components first. I just don't have my brain around using components in
an if/case fashion. Too many spinning plates for me:
http://www.youtube.com/watch?v=Zhoos1oY404
For homing, could you give the PID position command a constant ramp (use
the integ component?) until the home microswitch closes. At that
point, save whatever the position is as a constant position offset
(sample_hold component). Feed the sum of that and the desired tool
offset to the PID position input, to get to the desired tool.
For the question you asked, instead of resetting the encoders to zero,
maybe just save the difference between them. Below is the guts of a
component I wrote to multiplex between two jogwheels. It stores the
difference between the two jogwheels whenever it switches so there's no
glitch. I'm not sure if this is what you need either, but maybe it'll help.
Karl
variable long diff;
variable short prev_select;
if(!select) {
// Select the first jogwheel
if(prev_select)
diff += in2 - in1;
out = in1 - diff;
} else {
// Select the second jogwheel
if(!prev_select)
diff += in1 - in2;
out = in2 - diff;
}
prev_select = select;
--
The demand for IT networking professionals continues to grow, and the
demand for specialized networking skills is growing even more rapidly.
Take a complimentary Learning@Cisco Self-Assessment and learn
about Cisco certifications, training, and career opportunities.
http://p.sf.net/sfu/cisco-dev2dev
___
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Re: [Emc-users] Carousel Jogging
I see the first paragraph of my last post wasn't clear. Here it is again, hopefully more understandable. For homing, could you give the PID command a constant ramp (use the integ component?) until the home microswitch closes. At that point, save the feedback encoder's position as a constant offset (sample_hold component). For operation, feed the sum the stored offset and the desired tool position to the PID command to go to the desired tool. I think you could (should) still use the limit3 component right in front of the PID command input. Karl -- The demand for IT networking professionals continues to grow, and the demand for specialized networking skills is growing even more rapidly. Take a complimentary Learning@Cisco Self-Assessment and learn about Cisco certifications, training, and career opportunities. http://p.sf.net/sfu/cisco-dev2dev ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
