Re: [Emc-users] Question about using a rotary table

On Thu, 1 Oct 2009 08:32:47 -0500, you wrote: >I think several other folks have brought up some questions about this >proposal and maybe I can filter out some noise and make them more >explicit in order to help us talk about a more complete spec: Not supporting that proposal as defined, but here

Re: [Emc-users] Question about using a rotary table

> G90 G1A-10 would rotate ccw all the way back from where it is to -10 All the way meaning more than one rotation? Regards, Alex -- Come build with us! The BlackBerry® Developer Conference in SF, CA is the only developer

Re: [Emc-users] Question about using a rotary table

2009/10/2 Alex Joni : > >> G90 G1A-10 would rotate ccw all the way back from where it is to -10 > > All the way meaning more than one rotation? I think it rather has to. I am thinking in terms of acting the same way as a linear axis. Imagine milling a 2-start, 2-turn worm, you would expect: G0 X0

Re: [Emc-users] Wrapped rotary axes, Fanuc style: for testing

On Thu, 1 Oct 2009 15:53:02 -0500, you wrote: > exactly 1 full turn requires using g91 > more than one full turn requires using g91 Argghhh... N One flavour of Fanuc only (15b)! Why follow a bad design? Fanuc, as is their habit, changed it. Sensibly later Fanuc controllers treat rotary axi

Re: [Emc-users] Question about using a rotary table

On Thu, 1 Oct 2009 13:56:32 -0500, you wrote: >Gentlemen, > on the Fanuc 15mb control: > >exactly 1 full turn requires using g91 >more than one full turn requires using g91 Not one of Fanuc's better ideas and since changed :) Steve Blackmore -- -

Re: [Emc-users] Encoders

On Thu, 01 Oct 2009 12:32:48 -0400, you wrote: >And what I think I'm seeing is quantization noise in the time domain, the >occasionally very narrow spike probably isn't there on your o-scope. But it >(to me anyway) points to a problem in that the sampling is probably not being >done in the ba

Re: [Emc-users] Encoders

2009/10/2 Steve Blackmore : > On page 6 I changed the sampling rate to base thread. > > http://filebin.ca/wacbfm/screenshots.pdf Aha! I see noisy encoder signals. That seems to be confusing the velocity calculation (but possibly not the position calculation) I am also a little surprised that the

Re: [Emc-users] Encoders

2009/10/2 Andy Pugh : > Aha! I see noisy encoder signals. To see if that is the problem, you could debounce the signals in HAL. None of the glitches looks to be longer than one sample, so a single sample debounce should do. The drawback is that you potentially lose encoder at full speed. This is

Re: [Emc-users] WG: Re: WG: Re: axis and batch processing

Chris, Is your PROGRAM_PREFIX setting in the [DISPLAY] section set? Regards, Jan On Thu, Oct 1, 2009 at 12:54, Chris Epicier wrote: > Hi all > > I am in the process of cutting parts, due out soon. Should be doing million > things, other than keepin my cnc busy. > > I checked and rechecked the

Re: [Emc-users] Question about using a rotary table

On Fri, 2009-10-02 at 12:10 +0100, Andy Pugh wrote: > 2009/10/2 Alex Joni : > > > >> G90 G1A-10 would rotate ccw all the way back from where it is to -10 > > > > All the way meaning more than one rotation? > > I think it rather has to. I am thinking in terms of acting the same > way as a linear ax

Re: [Emc-users] Wrapped rotary axes, Fanuc style: for testing

On Fri, Oct 02, 2009 at 12:18:50PM +0100, Steve Blackmore wrote: > " One occurrence that is interesting - when the rotation in the same > direction reaches 360.0 (a full circle), it continues to increase. It > does not become zero degrees again." I think your book is describing the same behavior

[Emc-users] Material Edge Contour not visible

Hi guys, I'm using a cutter cadius compensation with gcode G41 and I follow the Material Edge Contour simply letting EMC to work and adjusting the trajectory based on my absolute coordinates. The trajectory I can see is only that of the backplot calculated (the tool path starting in the center o

Re: [Emc-users] Encoders

On Fri, Oct 02, 2009 at 12:37:05PM +0100, Steve Blackmore wrote: > On page 6 I changed the sampling rate to base thread. > > http://filebin.ca/wacbfm/screenshots.pdf Excellent, page 7 shows the problem very clearly. You have really awful spindle feedback. I'm surprised this works at all. You

Re: [Emc-users] Encoders

On Fri, 02 Oct 2009 12:37 +0100, "Steve Blackmore" wrote: > > I've redone that at 100 rpm, and out of interest looked at the pulses > out for the Z axis, the position interpolation is linear, as shown in > halscope, the pulses out are anything but! Surely they should be linear > too? > > Ther

Re: [Emc-users] Material Edge Contour not visible

On Fri, Oct 02, 2009 at 03:31:51PM +0200, 5150 wrote: > Hi guys, > I'm using a cutter cadius compensation with gcode G41 and I follow the > Material Edge Contour simply letting EMC to work and adjusting the trajectory > based on my absolute coordinates. The trajectory I can see is only that of >

Re: [Emc-users] Question about using a rotary table

Gentlemen, I can think of one scenario that the rotary (0-359.999) configuration will handle "better" than the linear (0 thru unlimited) configuration. On a 180 degree move you would give a command of B180 or B-180 (the same position). If the sign does not tell the machine which way to turn the

Re: [Emc-users] Wrapped rotary axes, Fanuc style: for testing

On Thu, Oct 01, 2009 at 03:53:02PM -0500, Chris Radek wrote: > > G53 still does the full unwind. Not anymore - now it uses the sign to determine which way to turn, and goes to the specified coordinate in that direction while disregarding g5x and g92 offsets. ---

Re: [Emc-users] Encoders

Andy Pugh wrote: > 2009/10/2 Steve Blackmore : > > >> On page 6 I changed the sampling rate to base thread. >> >> http://filebin.ca/wacbfm/screenshots.pdf >> > > Aha! I see noisy encoder signals. That seems to be confusing the > velocity calculation (but possibly not the position calculatio

Re: [Emc-users] Encoders

Jon Elson wrote: > OK, things look worse, and obvious noise is showing in the A and B > traces when you do this. > I think it shows that the sampling was being done at the faster rate > before. OOps, I misread what you had changed. Chris said it right. This is allowing you to see what is actua

Re: [Emc-users] Encoders

Steve Blackmore wrote: > > > I've redone that at 100 rpm, and out of interest looked at the pulses > out for the Z axis, the position interpolation is linear, as shown in > halscope, the pulses out are anything but! Surely they should be linear > too? > > There are several screenshots so I bundled

Re: [Emc-users] WG: Re: WG: Re: axis and batch processing

Chris Epicier wrote: >Hi all > >I am in the process of cutting parts, due out soon. Should be doing million >things, other than keepin my cnc busy. > >I checked and rechecked the syntax in bot, master, labels and other files. I >cannot find a mistake there. > >Is there a way I can debug this?

Re: [Emc-users] Encoders

On Friday 02 October 2009, Steve Blackmore wrote: >On Thu, 01 Oct 2009 12:32:48 -0400, you wrote: >>And what I think I'm seeing is quantization noise in the time domain, the >>occasionally very narrow spike probably isn't there on your o-scope. But >> it (to me anyway) points to a problem in that

Re: [Emc-users] 7I33 and mesa 5I20

Hi, now i finally found the right settings for my machine, but i have problems with oscilations. Below are two links of my settings and halscope screenshot. Please suggest a solution. Halscope Settings

Re: [Emc-users] Question about using a rotary table

Stuart Think about it. The linear will always be predictable. It moves from the current position to new position. In linear absolute mode -180 is not the same as 180. If I were at between -180 and 180 for a move to 180 it would move CW, a move to -180 it would move CCW . If the curren

Re: [Emc-users] Wrapped rotary axes, Fanuc style: for testing

On Fri, 2 Oct 2009 08:25:32 -0500, you wrote: >On Fri, Oct 02, 2009 at 12:18:50PM +0100, Steve Blackmore wrote: > >> " One occurrence that is interesting - when the rotation in the same >> direction reaches 360.0 (a full circle), it continues to increase. It >> does not become zero degrees again."

Re: [Emc-users] Encoders

On Fri, 02 Oct 2009 11:34:45 -0500, you wrote: >. I would think a 1 K Ohm >resistor from +5 V to the A and B would make a big difference. You can >get +5 V from the game port or a >hard drive plug. Yup, also looking closer, I see COORDINATED spikes in >both A and B on a number of >cycles. Th

Re: [Emc-users] Encoders

> On page 6 I changed the sampling rate to base thread. good, the first 5 pages are in respect to phase-a & b irrelevant. Looking at page 6 however, A&B look really bad, try running them through a debounce first. That might increase chances of success. > http://filebin.ca/wacbfm/screenshots.pdf

Re: [Emc-users] Question about using a rotary table

On Fri, 2 Oct 2009 09:29:05 -0500, you wrote: >Gentlemen, > I can think of one scenario that the rotary (0-359.999) configuration will >handle "better" than the linear (0 thru unlimited) configuration. > >On a 180 degree move you would give a command of B180 or B-180 (the same >position). If the

Re: [Emc-users] Encoders

On Friday 02 October 2009, Andy Pugh wrote: >2009/10/2 Steve Blackmore : >> On page 6 I changed the sampling rate to base thread. >> >> http://filebin.ca/wacbfm/screenshots.pdf > >Aha! I see noisy encoder signals. That seems to be confusing the >velocity calculation (but possibly not the position c

Re: [Emc-users] Wrapped rotary axes, Fanuc style: for testing

On Fri, Oct 02, 2009 at 04:05:54PM +0100, Steve Blackmore wrote: > Ehh? Ehh? > It's sane for any rotary, particularly those that CAN rotate forever. OK, matter of opinion. Let me explain and justify my opinion further down. Simply restating it is silly. > Also as Andy pointed out, you can do

Re: [Emc-users] Wrapped rotary axes, Fanuc style: for testing

2009/10/2 Chris Radek : >> Also as Andy pointed out, you can do an optional short move to zero in >> some controllers, invent a code for it if considered essential. > > OK, I agree a counterproposal might have this scheme. G1.1 and G0.1 ? Take the shortest route and reset the machine coordinates

Re: [Emc-users] Wrapped rotary axes, Fanuc style: for testing

As a spur gear tooth cutter one needs 0-360, but a helical gear cutter goes above 360, a worm maker may need up to 10 turns, a thread miller may want a lot more. For a hobbing machine many hundreds or thousands of turns but returning to the real homed 0 or arbitary angle in less than one turn is th