Re: [Emc-users] Hostmot2 homing
Hi Ken, Yes, this was under load. Les Kenneth Lerman wrote: > Did you measure that while it was connected to the receiver? If the > terminator is 100 ohms and the pull up is 1K ohms, the voltage under > load would only be around 400 mv. That should be fine, I think. > > If the pull up is 10K, then you would have around 40 mv. I don't think > that would work too well. > > Ken > -- Enter the BlackBerry Developer Challenge This is your chance to win up to $100,000 in prizes! For a limited time, vendors submitting new applications to BlackBerry App World(TM) will have the opportunity to enter the BlackBerry Developer Challenge. See full prize details at: http://p.sf.net/sfu/Challenge ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Uni-directional approach?
For a point to point application. A simple x/y table could benefit by a unidirectional approach feature. Is this specialization supported by G-code and EMC? OR is backlash compensation the avenue to achieve the required results? A brief "seach" for such a topic was not rewarded, perhaps I need to increase my "search awareness factor". Regards Cal -- Enter the BlackBerry Developer Challenge This is your chance to win up to $100,000 in prizes! For a limited time, vendors submitting new applications to BlackBerry App World(TM) will have the opportunity to enter the BlackBerry Developer Challenge. See full prize details at: http://p.sf.net/sfu/Challenge ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Hostmot2 homing
I'll give it a try tomorrow. Thanks, Les > > Well if the extra filtering of the TTL inputs helps, I would do the trick > with > raw-write to setup the filter time constant (the QFilterRate register at > 0x3400). Currently the filter frequency is 33 MHZ which gives a 450 ns time > constant: good for encoder count rates up to ~4 MHz, if the filter was set to > divide by 8 (loaded with 6) you could still count up to 500 KHz but reject > pulses up to 4 uSec long. You can divide the 33 MHz by up to 2049 (which > _will_ be too slow, limiting your count rate to ~2KHz (filter on) or 10KHz > (filter off) > -- Enter the BlackBerry Developer Challenge This is your chance to win up to $100,000 in prizes! For a limited time, vendors submitting new applications to BlackBerry App World(TM) will have the opportunity to enter the BlackBerry Developer Challenge. See full prize details at: http://p.sf.net/sfu/Challenge ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Hostmot2 homing
On Fri, 17 Jul 2009, Leslie Newell wrote:
> Date: Fri, 17 Jul 2009 22:13:46 +0100
> From: Leslie Newell
> Reply-To: "Enhanced Machine Controller (EMC)"
>
> To: "Enhanced Machine Controller (EMC)"
> Subject: Re: [Emc-users] Hostmot2 homing
>
> Hi Peter,
>
> Each output swings from 0.48V to 4.1V. When IDX is high, /IDX is low.
> Therefore the voltage between them is about 3.6V.
>
> Les
>
Well if the extra filtering of the TTL inputs helps, I would do the trick with
raw-write to setup the filter time constant (the QFilterRate register at
0x3400). Currently the filter frequency is 33 MHZ which gives a 450 ns time
constant: good for encoder count rates up to ~4 MHz, if the filter was set to
divide by 8 (loaded with 6) you could still count up to 500 KHz but reject
pulses up to 4 uSec long. You can divide the 33 MHz by up to 2049 (which
_will_ be too slow, limiting your count rate to ~2KHz (filter on) or 10KHz
(filter off)
>
>> What I was asking about (maybe not very well) is differential drive: in other
>> words measured between IDX and /IDX. This should be positive in one index
>> state and negative in the other.
>
>
> --
> Enter the BlackBerry Developer Challenge
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> vendors submitting new applications to BlackBerry App World(TM) will have
> the opportunity to enter the BlackBerry Developer Challenge. See full prize
> details at: http://p.sf.net/sfu/Challenge
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> https://lists.sourceforge.net/lists/listinfo/emc-users
>
Peter Wallace
Mesa Electronics
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Re: [Emc-users] Hostmot2 homing
Did you measure that while it was connected to the receiver? If the terminator is 100 ohms and the pull up is 1K ohms, the voltage under load would only be around 400 mv. That should be fine, I think. If the pull up is 10K, then you would have around 40 mv. I don't think that would work too well. Ken Leslie Newell wrote: > Hi Peter, > > Each output swings from 0.48V to 4.1V. When IDX is high, /IDX is low. > Therefore the voltage between them is about 3.6V. > > Les > > > >> What I was asking about (maybe not very well) is differential drive: in >> other >> words measured between IDX and /IDX. This should be positive in one index >> state and negative in the other. >> > > > -- > Enter the BlackBerry Developer Challenge > This is your chance to win up to $100,000 in prizes! For a limited time, > vendors submitting new applications to BlackBerry App World(TM) will have > the opportunity to enter the BlackBerry Developer Challenge. See full prize > details at: http://p.sf.net/sfu/Challenge > ___ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Kenneth Lerman Mark Kenny Products Company, LLC 55 Main Street Newtown, CT 06470 888-ISO-SEVO 203-426-7166 -- Enter the BlackBerry Developer Challenge This is your chance to win up to $100,000 in prizes! For a limited time, vendors submitting new applications to BlackBerry App World(TM) will have the opportunity to enter the BlackBerry Developer Challenge. See full prize details at: http://p.sf.net/sfu/Challenge ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Hostmot2 homing
Hi Peter, Each output swings from 0.48V to 4.1V. When IDX is high, /IDX is low. Therefore the voltage between them is about 3.6V. Les > What I was asking about (maybe not very well) is differential drive: in other > words measured between IDX and /IDX. This should be positive in one index > state and negative in the other. -- Enter the BlackBerry Developer Challenge This is your chance to win up to $100,000 in prizes! For a limited time, vendors submitting new applications to BlackBerry App World(TM) will have the opportunity to enter the BlackBerry Developer Challenge. See full prize details at: http://p.sf.net/sfu/Challenge ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Hostmot2 homing
On Fri, 17 Jul 2009, Leslie Newell wrote:
> Date: Fri, 17 Jul 2009 20:48:16 +0100
> From: Leslie Newell
> Reply-To: "Enhanced Machine Controller (EMC)"
>
> To: "Enhanced Machine Controller (EMC)"
> Subject: Re: [Emc-users] Hostmot2 homing
>
> Hi Peter,
>
>> One difference is that the TTL inputs have an RC filter, the differential
>> inputs have none.
>
> Hmm, that could still point towards a noise issue then.
>
>
>> I wonder if your index outputs can drive the termination resistor. Have you
>> measured you index and /index outputs for reasonable differential output
>> voltage when terminated by the 7I29?
>
> The outputs swing from 0.48V to 4.1V. It makes no noticeable difference
> in either TTL or differential modes.
What I was asking about (maybe not very well) is differential drive: in other
words measured between IDX and /IDX. This should be positive in one index
state and negative in the other.
Peter Wallace
Mesa Electronics
(\__/)
(='.'=) This is Bunny. Copy and paste bunny into your
(")_(") signature to help him gain world domination.
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Re: [Emc-users] Hostmot2 homing
Hi Peter, > One difference is that the TTL inputs have an RC filter, the differential > inputs have none. Hmm, that could still point towards a noise issue then. > I wonder if your index outputs can drive the termination resistor. Have you > measured you index and /index outputs for reasonable differential output > voltage when terminated by the 7I29? The outputs swing from 0.48V to 4.1V. It makes no noticeable difference in either TTL or differential modes. > Also are you sure about the jumpering: differntal mode is selectec with > jumper > W1 or W4 moved so its closer to the encoder 10 pin header Yes. At the moment the jumper is away from the header. > Im not sure there are any guarantees of what will happen if one input is > connected to a possibly noisy input line and the other is open. I would not > expect any outputs signal as I would expect the termination resistor to make > the open input follow the noise driven input. According to your 7i33 data sheet you are using a 26LS32 which has a differential voltage sensitivity of 100mV. I disconnected the line at the encoder end (very difficult at the drive end with those IDC headers) so noise pickup on the line could be enough to get past that threshold. The 26LS32 has a built in pull up resistor on one input and a pull down on the other to try to catch a disconnected line. However your terminating resistor is probably swamping the effect of the internal resistors. > Yes, and we've pretty much had 0 trouble with it. Heh. I'm good at breaking things :-) Les -- Enter the BlackBerry Developer Challenge This is your chance to win up to $100,000 in prizes! For a limited time, vendors submitting new applications to BlackBerry App World(TM) will have the opportunity to enter the BlackBerry Developer Challenge. See full prize details at: http://p.sf.net/sfu/Challenge ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Hostmot2 homing
? An open collector output is just that, open collector. You need to terminate it at the lead end with resistor according to the voltage you're using, to the positive rail. Terminating with a 100R to ground is simply a poor configuration. Regards Roland 2009/7/17 Jon Elson > Peter C. Wallace wrote: > > One difference is that the TTL inputs have an RC filter, the differential > > inputs have none. > > > > I wonder if your index outputs can drive the termination resistor. Have > you > > measured you index and /index outputs for reasonable differential output > > voltage when terminated by the 7I29? > > > Very good point! Some of these open collector encoders with puny 1 K > (or even higher) pull-up resistors will not give a whole lot of signal > with a 100 Ohm termination. > It wouldn't take a lot of electrical noise to reduce that noise margin > to zero. > > Jon > > > -- > Enter the BlackBerry Developer Challenge > This is your chance to win up to $100,000 in prizes! For a limited time, > vendors submitting new applications to BlackBerry App World(TM) will have > the opportunity to enter the BlackBerry Developer Challenge. See full prize > details at: http://p.sf.net/sfu/Challenge > ___ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Enter the BlackBerry Developer Challenge This is your chance to win up to $100,000 in prizes! For a limited time, vendors submitting new applications to BlackBerry App World(TM) will have the opportunity to enter the BlackBerry Developer Challenge. See full prize details at: http://p.sf.net/sfu/Challenge ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Current state of EMC2 teach funtionality ?
Hi all, I just got a message from a guy in Germany who is looking at EMC for a retrofit on a CNC rolling machine. It can be used to roll tubes or cones, and has 6 adjustable axes, with linear scales and hydraulic motors. He has the analog servo drives for the proportional hydraulic valves. I think we can figure out how to drive them, but may need to use a HAL component to add dither to the signal sent to the valves. The major question is that he wants to teach the program to the machine, not code it up in G-code in advance. I know that "teaching" has been discussed ad infinitum, and ISTR that there may be a script for recording positions during teaching. Can anyone fill me in on the current state of affairs re: teaching? I'm not sure exactly what is needed here, whether this just requires changing roller positions and then running the part back and forth, change rollers, run through again, etc. or whether the rollers are changed while the part is IN the rollers, and the rate and relationship of different rollers is all required in the program. I'm also not too clear on whether the program, once recorded, will then just be run over and over on many parts, but I think that is the idea. Jon -- Enter the BlackBerry Developer Challenge This is your chance to win up to $100,000 in prizes! For a limited time, vendors submitting new applications to BlackBerry App World(TM) will have the opportunity to enter the BlackBerry Developer Challenge. See full prize details at: http://p.sf.net/sfu/Challenge ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] newbies and 7i43 and join following error ..
Thank you to all of you. your answers helped med a lot to debug the problem which was ... a bad ribbon cable between the 7i43 and a screw terminal board...yepp always something stupid. but I learned a lot on the way. So now I need to play with scaling and PID tuning.. -- Enter the BlackBerry Developer Challenge This is your chance to win up to $100,000 in prizes! For a limited time, vendors submitting new applications to BlackBerry App World(TM) will have the opportunity to enter the BlackBerry Developer Challenge. See full prize details at: http://p.sf.net/sfu/Challenge ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
