Re: [Emc-users] Compact Flash card for Hard Drive
Hi Kirk, You must be very lucky. I have a whole stack of dead drives. When a hard drive fails it is very often catastrophic failure and you lose everything. One day it's working fine, the next day it won't boot. With Flash if you do get a failure it is likely to only be a few bits which can be detected and often recovered with parity and error checking. The quoted number of write cycles is the guaranteed minimum and most sectors will handle far more. I use a flash microcontroller that has a rated life of 100 write cycles. Some of my development boards have probably had ten times that or more and I have never had a programming failure. With the setup I use on my lathe for example you don't notice any difference in usability. You can load and save files exactly as you would with a hard drive. The only noticeable difference is that you lose the log files if you reboot. Les Kirk Wallace wrote: I am not trying to disagree, but my experience has not indicated that hard drives are unreliable. I haven't had a hard drive fail on me for over ten years. Usually the whole PC gets replaced before a drive goes out, and I usually get second hand PC's as a replacement. My file server drive is at least eight years old. So from my experience, generally, hard drives are pretty darn reliable. Right from the get go, with flash, there is all this talk about memory cell life, and how best to get by with having data storage without actually using it. I get the feeling that you never know when they will fail and I just don't need the extra stress in my what's left of my life. It seems like getting a gallon of ice cream and leaving it in the freezer, so you will always have some. In my house, everyone thinks it's there to be eaten, so you can't be shy. -- Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Compact Flash card for Hard Dr ive
Hi Kirk, You must be very lucky. I have a whole stack of dead drives. When a hard drive fails it is very often catastrophic failure and you lose everything. One day it's working fine, the next day it won't boot. Hello Guys, I use 1Gb DOM Flash as main HDD. System does work more that one year without any problem. But I use Puppy Linux instead Ubuntu. Puppy has write cycles only on showdown event. Evgeny -- Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Beginning with HAL
Hello all, I have some experience in CNC robotics, but im really new to HAL structure. Im developing a servo driver, with will get the samples from the encoders and send them to the parallel port in packages, and also will get the duty cycle information from the parallel port and send it to the motors. My problem is. I need to write a driver? on the HAL structure to make that communication protocol that i created, with is: IN - 8 bytes of data -- lower significant part of the encoder position. motor1 IN - 8 bytes of data -- higher significant part of the encoder position. motor1 IN - 8 bytes of data -- lower significant part of the encoder position. motor2 IN - 8 bytes of data -- higher significant part of the encoder position. motor2 IN - 8 bytes of data -- lower significant part of the encoder position. motor3 IN - 8 bytes of data -- higher significant part of the encoder position. motor3 IN - 8 bytes of data -- lower significant part of the encoder position. motor4 IN - 8 bytes of data -- higher significant part of the encoder position. motor4 IN - 8 bytes of data -- lower significant part of the encoder position. motor5 IN - 8 bytes of data -- higher significant part of the encoder position. motor5 OUT - 8 bytes of PWM data to the 1st motor OUT - 8 bytes of PWM data to the 2nd motor OUT - 8 bytes of PWM data to the 3rd motor OUT - 8 bytes of PWM data to the 4th motor OUT - 8 bytes of PWM data to the 5th motor Is it easy job? and can any1 send me a tutorial about simple HAL programming. Tnx alot, Adriano. -- Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Compact Flash card for Hard Drive
Just as another data point, many of the Netbooks come with a solid state drive, and most are running some form of linux too. An example would be the Asus EePC, for which Crucial suggest the following: http://www.crucial.com/uk/store/mpartspecs.aspx?mtbpoid=255C2650A5CA7304 -- atp -- Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] How Exactly does a Mister Work
I have some ruby orifices measuring -- two sizes 11.5 and 26 thousandths. They are set in brass cylinders measuring .125 by .125 with a slight tapered end. They also have stainless steel screens to keep them from clogging. I usually press fit them into a reamed hole. I can spare a few if Gene or someone would like to try them. Ken dave wrote: On Fri, 2009-11-20 at 16:39 +, Andy Pugh wrote: 2009/11/20 Gene Heskett gene.hesk...@gmail.com: A cube of dry ice sitting on it would help, but would raise the available oxygen too. I am fairly sure it would displace the oxygen (being heavier) and so would both cool and reduce oxide formation. You might have hit on a cunning plan, and it would look cool too. Carbon Dioxide doesn't disassociate easily but will if pushed hard. It cannot be used in heat-treating furnaces for that reason but for cooling/shielding Al machined parts I think it will work just fine. I'm not sure the kinetics of Al oxidation are as aggressive as Gene states but cannot find any evidence to support or disallow such a claim. The oxidation curve, at least at high temps (600 F), is parabolic so it limits fairly quickly. A couple of alternatives for small orifices come to mind. Diesel rebuild shops should always have a supply of used injector nozzles. I understand the newer ones are carbide. IIRC Gene had a tap remover (crude edm) running at one time. That should fab almost any small hole he wants. :-) Small volumes of oil/mist might be available by using model airplane engines as pumps. Just thinking out loud. Usually dangerous. Dave -- Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Kenneth Lerman 55 Main Street Newtown, CT 06470 203-426-3769 -- Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Deadband, FF1 and FF2
Hello- I'm having some difficulty tuning my P, I, and D variables. I've used PID before in school, and understand how they are calculated, but I wanted to ask about the three terms I don't really understand... I found in the wiki these explanations: *FF1 = 2.000 a velocity feedforward, helps reduce following error proportional to velocity * * FF2 = 0.25 an acceleration feedforward, helps reduce foll. error when accelerating* However I dont quite understand them- would someone be willing to maybe define the math behind these concepts? and also- is deadband the window over and under 0 volts that yields no movement? does this mean that you can kill steady-state oscillations by increasing deadband? Thanks again!!! -pat -- Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Deadband, FF1 and FF2 (cont'd)
Also- if you guys dont mind- please gimme an Idea of what you have these variables set to and what kinda results they gave you. Thanks again!!! -Pat -- Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Deadband, FF1 and FF2
FF1 adds a percentage of the commanded velocity to the output. Ideally in a steady state FF1 should be high enough that P doesn't have to do anything. FF2 adds a percentage of the commanded acceleration to the output. Ideally FF2 should be high enough that D doesn't do anything. Basically they are creating a rough mathematical model of the motor and machine so that emc can calculate the motor's needs in advance. If the model was perfect you would not need any P or D but in practice you still need them reasonably high. Here is how I set them up. First set I to zero and set the following error limit quite high (say 1 or more). Set P and D as low as possible while not tripping the following error limit. Now do long moves at your average feed rate and keep turning up FF1 until the following error during steady state movement is as low as possible. If you go too high the following error will start going up again. Next do a series of short moves and keep turning FF2 up until the following error during acceleration is as low as possible. Once you have FF1 and FF2 set up, play with P and D to get rid of the remaining errors. Test P and D over a range of feed rates and at rapid rate. Finally tweak I to get the steady state error down. Afterwards you may need to adjust I and D up a bit more. Expect to spend around 1 day per axis to get it spot on. and also- is deadband the window over and under 0 volts that yields no movement? does this mean that you can kill steady-state oscillations by increasing deadband? Only use deadband to stop I from continually tripping between two encoder counts at idle. Normally 1/2 of one encoder count is enough deadband. You cannot use deadband to stop oscillation. I would set this to 0 until the axis is properly tuned. Also- if you guys dont mind- please gimme an Idea of what you have these variables set to and what kinda results they gave you. How long is a piece of string? These values are VERY dependent on your setup. There are no fixed values that you can use. On my lathe I can get 0.001 following error at all times with rapid up to 4m/min or 160IPM. At feed rate or stationary it is much lower. Les Pat Lyons wrote: Hello- I'm having some difficulty tuning my P, I, and D variables. I've used PID before in school, and understand how they are calculated, but I wanted to ask about the three terms I don't really understand... I found in the wiki these explanations: *FF1 = 2.000 a velocity feedforward, helps reduce following error proportional to velocity * * FF2 = 0.25 an acceleration feedforward, helps reduce foll. error when accelerating* However I dont quite understand them- would someone be willing to maybe define the math behind these concepts? and also- is deadband the window over and under 0 volts that yields no movement? does this mean that you can kill steady-state oscillations by increasing deadband? Thanks again!!! -pat -- Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Deadband, FF1 and FF2
Basically, at no load, a servo amplifier has a characteristic relationship between the voltage in and the velocity. If the relationship is (close to) linear, then FF1 will give an approximately correct speed even before specifying P, I, D. On an inch machine, if you set the OUTPUT_SCALE so that a PID output (PWM/DAC input) of 1.0 makes the axis move at 1.0 inch/second, then the correct value for FF1 is 1. More generally, the value of FF1 should be the PID output (PWM/DAC input) that gives a speed of 1.0 inch/second. FF2 is like FF1 but for acceleration instead of velocity. However, I don't know of a simple rule of thumb for setting FF2. Instead, I used halscope to look at the error during G1 moves and tweaked it until the errors in the accel/decel phase were minimized. In the case of my own system, the magnitude of FF2 is about 1% of FF1. Jeff -- Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Beginning with HAL
Le lundi 23 novembre 2009 11:16:14, Adriano Gonçalves a écrit : Hello all, I have some experience in CNC robotics, but im really new to HAL structure. Im developing a servo driver, with will get the samples from the encoders and send them to the parallel port in packages, and also will get the duty cycle information from the parallel port and send it to the motors. My problem is. I need to write a driver? on the HAL structure to make that communication protocol that i created, with is: IN - 8 bytes of data -- lower significant part of the encoder position. motor1 IN - 8 bytes of data -- higher significant part of the encoder position. motor1 IN - 8 bytes of data -- lower significant part of the encoder position. motor2 IN - 8 bytes of data -- higher significant part of the encoder position. motor2 IN - 8 bytes of data -- lower significant part of the encoder position. motor3 IN - 8 bytes of data -- higher significant part of the encoder position. motor3 IN - 8 bytes of data -- lower significant part of the encoder position. motor4 IN - 8 bytes of data -- higher significant part of the encoder position. motor4 IN - 8 bytes of data -- lower significant part of the encoder position. motor5 IN - 8 bytes of data -- higher significant part of the encoder position. motor5 OUT - 8 bytes of PWM data to the 1st motor OUT - 8 bytes of PWM data to the 2nd motor OUT - 8 bytes of PWM data to the 3rd motor OUT - 8 bytes of PWM data to the 4th motor OUT - 8 bytes of PWM data to the 5th motor Is it easy job? and can any1 send me a tutorial about simple HAL programming. Tnx alot, Adriano. Hi Adriano, I'm not sure I understand what you're tring to do. Do you need each // port line input to act as a serial input for 8 bits words representing low and high part of the data from the encoder ? Do you need each // port line output to send 8 bits words serial data to your PWM hardware ? If this is the expected behaviour, I'm not sure EMC can work that way. For what I know, EMC inputs directly data from encoders, and measure time difference between pulses, and with that calculates the encoder position. For the output, what il usually done is to output motor commands on two lines: one for direction, one for the step pulses. 1 or 0 on the direction line change the motor direction rotation, each pulse on the step line makes the motor rotate for one step in the selected direction. -- Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Beginning with HAL
On Mon, Nov 23, 2009 at 08:16:14AM -0200, Adriano Gon?alves wrote: Im developing a servo driver, with will get the samples from the encoders and send them to the parallel port in packages, and also will get the duty cycle information from the parallel port and send it to the motors. Several of the existing drivers work this way. Getting encoder counts and sending out a velocity command every servo cycle is the basic HAL model EMC uses to run servos. The mesa/hostmot2 and motenc drivers do this with a PCI interface, the ppmc and pluto devices use EPP over the parallel port, and the STG uses the ISA bus. Maybe study one or all of those drivers and then come back with more specific questions? (Also, the emc-developers list might be a better place for this) Chris -- Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] How Exactly does a Mister Work
On Monday 23 November 2009, Kenneth Lerman wrote: I have some ruby orifices measuring -- two sizes 11.5 and 26 thousandths. They are set in brass cylinders measuring .125 by .125 with a slight tapered end. They also have stainless steel screens to keep them from clogging. I usually press fit them into a reamed hole. I can spare a few if Gene or someone would like to try them. Ken Thanks for the offer, Kenneth. But in my case, I think I'd settle for a quality needle valve. The air flow takes care of the droplet generation quite well, and at my low pressures of 20-40 psi, doesn't really make an airborne nuisance or hazard. I just haven't hit all the gittin places. Yet. :) Thought exercises here have involved edm to be sure, but my prowling the net looking for suitable electrodes to use has been largely futile, as about 1mm seems to be the lower limit. Deep holes with my passive fluid setup are another problem, I learned a lot about deep holes while removing those broken 6-32 taps. :) The bottom line is that it appears I now have something that works much better than tipping an 8oz bottle of cutting oil up and running some down the spinning bit. -- Cheers, Gene There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) The NRA is offering FREE Associate memberships to anyone who wants them. https://www.nrahq.org/nrabonus/accept-membership.asp Quantum Mechanics is a lovely introduction to Hilbert Spaces! -- Overheard at last year's Archimedeans' Garden Party -- Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Beginning with HAL
Adriano Gonçalves wrote: Hello all, I have some experience in CNC robotics, but im really new to HAL structure. Im developing a servo driver, with will get the samples from the encoders and send them to the parallel port in packages, and also will get the duty cycle information from the parallel port and send it to the motors. My problem is. I need to write a driver? on the HAL structure to make that communication protocol that i created, with is: You might take a look at the driver for my boards, hal_ppmc.c in the hal/drivers directory. It does basically the except each board is only 4 axes. Jon -- Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Deadband, FF1 and FF2
Pat Lyons wrote: Hello- I'm having some difficulty tuning my P, I, and D variables. I've used PID before in school, and understand how they are calculated, but I wanted to ask about the three terms I don't really understand... I found in the wiki these explanations: *FF1 = 2.000 a velocity feedforward, helps reduce following error proportional to velocity * * FF2 = 0.25 an acceleration feedforward, helps reduce foll. error when accelerating* However I dont quite understand them- would someone be willing to maybe define the math behind these concepts? Commanded velocity is computed by differentiating position, multiplied by FF1 and then added to the PID routine's output. Acceleration is then computed from commanded velocity, X FF2 and added to the PID output. and also- is deadband the window over and under 0 volts that yields no movement? does this mean that you can kill steady-state oscillations by increasing deadband? Yes, that is exactly it, measured in user units, not volts. So, if actual position differs by up to 10 ^ -5 inch, and deadband is set to 10^-5 inch, then the P output will remain zero. Deadband doesn't COMPLETELY kill oscillation, but it does serve to reduce it and allow it to settle into the deadband. You usually set it to 1.5 X the dimension of an encoder count. Jon -- Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Halscope interpretation
Looking at a plot in halscope, I was expecting the difference between coarse-position-command and joint-pos-fb would be the same as the f-error, it appears not to be. Can you explain please? http://imagebin.org/72688 Thanks, Richard -- Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Compact Flash card for Hard Drive
On Mon, 23 Nov 2009 08:06:18 +, you wrote: You must be very lucky. I have a whole stack of dead drives. When a hard drive fails it is very often catastrophic failure and you lose everything. One day it's working fine, the next day it won't boot. You must have had the same batch of Craptor IDE drives (Maxtor's) I had. All failed at 3 years plus a month or two (70 odd in total) a year since. Another thirty PC's fitted with Seagate drives and installed at the same time are still going strong, as are a handful with Western Digital Drives. I've got a couple of servers with Seagate Ultra SCSI's in that are now 8 years old and are still working fine. They've been relegated to non critical tasks and they will get trashed when they eventually fail. Steve Blackmore -- -- Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Compact Flash card for Hard Drive
I've been a diehard Seagate fan but recently I have heard some people having problems with 1TB Seagate drives.At some point the dropping price and the increasing density is going to become a quality issue - perhaps that day is close? Yes, I lived through the Maxtor problems also. I got a lot less than 3 years out of several. Fujitsu also had a bunch of hard drive issues about 8 years ago. The problem was so severe that Siemens sent techs out to large installations with boxes of replacement drives to do the swap outs before they died in the field in Industrial PC applications.Those retrofits must have cost a small fortune. Is your lathe still happily cutting threads? I cut some axle spindles the other day and the first one off the machine accepted a 1 long - 1-14 nut perfectly. The pitch was right on. I'm using a 200 ppr encoder in counter mode and the PC has no problem tracking the index at up to 1200 rpm so far. I calculated a 1500 rpm top speed before it loses index sync. Threading has been rock solid reliable so far. I ran out of stock after 7 parts. Dave Steve Blackmore wrote: On Mon, 23 Nov 2009 08:06:18 +, you wrote: You must be very lucky. I have a whole stack of dead drives. When a hard drive fails it is very often catastrophic failure and you lose everything. One day it's working fine, the next day it won't boot. You must have had the same batch of Craptor IDE drives (Maxtor's) I had. All failed at 3 years plus a month or two (70 odd in total) a year since. Another thirty PC's fitted with Seagate drives and installed at the same time are still going strong, as are a handful with Western Digital Drives. I've got a couple of servers with Seagate Ultra SCSI's in that are now 8 years old and are still working fine. They've been relegated to non critical tasks and they will get trashed when they eventually fail. Steve Blackmore -- -- Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Spindle positioning in degrees
Well, i think i will improve my pid to make it more accurate and then continue with the tests. About the range of the angular axis, if i use the index-enable pulse of the mesa 5i20 encoder module (wich says that the position is reset to zero when an index pulse has ocurred) for reset the counter to 0, could this be useful to do that? also the counter in the gui will be reset to zero? or i have to make a little of logical with hal to make this work? Thanks again for your attention. Regards. Leonardo. 2009/11/22 Stuart Stevenson stus...@gmail.com I haven't tried the ss-wrapped-rotary branch yet but I will shortly. It may do what you want in keeping the numbers between 0 - 360. That is the specific purpose for it. On Sun, Nov 22, 2009 at 4:55 AM, robert rob...@innovative-rc.com wrote: Well the thing that comes to my mind is to make something in hal and use the index pulse to reset the C axis to zero everytime the pulse is activated. So the axis count will go from 0 to 360 degree and then start all over again from 0. Well it's just an approach to what i'm trying to do, i really appreciate your help as always :) so correct me if i'm saying something wrong please. that is correct when you switch to C axis mode you will need to reset on the first index then go about getting into position you could keep clearing on index pulse as you say to give 0 - 360 or you can make it so you only reset count for the thirst turn in C axis mode then you can have unlimited number of degrees depends what you are looking to do. dont forget about the *pid.*/N/*.maxerrorI* to stop all that error windup from long spindle runs. good luck with your setup. -- Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Few will listen, Of the few who listen, fewer still will understand, Understanding does not mean believe, Of the handful who believe, most may not know what to do, Those who even know, how many will actually do ? And the rare ones who have done it... Need not listen anymore. you can lead a person to knowledge but you cannot make him think -- Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
