Re: [Emc-users] Question about closed loop CNC

In a closed loop their is feed back, read about control theory. Stepper motors are usually run open loop and no feedback is needed although they may loose steps if not correctly tuned. Nicklas Karlsson On Mon, 18 Jan 2016 23:04:05 -0800 Chris Albertson wrote: >

Re: [Emc-users] A heads up on IDC ribbon connectors from China

st > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users -- Karlsson & Wang <nicklas.karls...@karlssonwang.se> -- Site24x7 APM Insight: Get Deep Visibility into App

Re: [Emc-users] Xenomai, machinekit

> > linuxcnc.org has no xenomai kernel support in its stable or development > > branches. The version in what is now the machinekit fork was never made > > into a form that could be merged with standard linuxcnc. This doesn't > > mean that no Xenomai support can ever be merged, but nobody seems

[Emc-users] Xenomai, machinekit

Do anybody know how to compile for xenomai? I use the xenomai kernel. Linuxcnc I compiled myself run in user space and there is a huge difference between this and the version from machinekit which use xenomai real time. Regards Nicklas Karlsson

Re: [Emc-users] Stepper Motors/Drives

> Hey Guys, > > I have never dealt with stepper motors/drives and one of the guys at our > shop is kicking around converting and old 9x30 Southbend lathe to cnc > using Linuxcnc. Are there any recommendations on maybe some kits with > all the power stuff (motors, power supplies, cables, etc,)

Re: [Emc-users] Z axis stepper gradually losing position (opto coupler speed)

> ... > I take it you do not have any opto-isolation in those 3 paths. That 700 > ns is pushing an opto's ability to switch that fast. The BoB I used was > all opto, and I was warned about its speed by someone (Steve Stallings?) > on this list. > ... Yes opto couplers are not very fast, I

[Emc-users] Intel Xeon, Real time performance

Old servers with intel Xeon are often for sale rather cheap, have anyone tested how they perform in the latency test? Nicklas Karlsson -- ___ Emc-users mailing list

Re: [Emc-users] Intel Xeon, Real time performance

25k? Should it be 25µ? I tried POS terminals, they have touch screen but delay is not good. > On 10 November 2015 at 20:10, Karlsson & Wang > <nicklas.karls...@karlssonwang.se> wrote: > > Old servers with intel Xeon are often for sale rather cheap, have anyone >

Re: [Emc-users] PWMGEN in PDM mode and not PWM

PDM I am pretty sure should be fixed. Then number of pulses increase with increasing speed it may be the encoder signal? On Mon, 09 Nov 2015 12:29:12 + "Marius Liebenberg" wrote: > Hi All > I have a pwmgen setup to take the spindle command to generate a pwm >

Re: [Emc-users] PWMGEN in PDM mode and not PWM

Stepper motor? On Mon, 09 Nov 2015 12:29:12 + "Marius Liebenberg" wrote: > Hi All > I have a pwmgen setup to take the spindle command to generate a pwm > signal. What I see on my scope is a PDM signal. I.E. the number of > pulses increase as I increase the speed.

Re: [Emc-users] could Linux cnc control of unconventional ... hydraulic

> 2015-11-09 8:49 GMT+02:00 Eric Keller : > > > there were hydraulic milling machines sold based on Moog hydraulics > > and Bridgeport iron. I assume those two companies could screw things > > up, but the world has moved on. To move a long distance takes a lot > > of power.

Re: [Emc-users] could Linux cnc control of unconventional ... hydraulic

On Sun, 8 Nov 2015 15:47:37 + (UTC) richsh...@comcast.net wrote: > I suggest looking at a hydraulic approach. It eliminates all of the drive > lash problems with the rigidity problems that follow. Ingersoll Rand built a > prototype mill similiar to what you are describing, you may find

Re: [Emc-users] could Linux cnc control of unconventional ... hydraulic

> On 8 November 2015 at 17:10, Karlsson & Wang > <nicklas.karls...@karlssonwang.se> wrote: > > > Hydraulic, that seems interesting how does hydraulic compare to a ball > > screw then it come to back slash and accuracy? > > Accuracy is limited by the feedback

Re: [Emc-users] could Linux cnc control of unconventional ... hydraulic

> On 8 November 2015 at 18:26, Karlsson & Wang > <nicklas.karls...@karlssonwang.se> wrote: > > > Servohydraulic cylinders have low friction instead of perfect sealing? > > The ones I have worked with, yes. > > I was at the high-force high-accuracy end,

[Emc-users] Linuxcnc pre installed, (imrovments --> copyright)

They got the code for free and now they must share improvements for free. If a pre installed version of linuxcnc is found somewhere we should not forget the most important to check if they added someting useful. Nicklas Karlsson

Re: [Emc-users] OT - Newsgroup email

For me it is normal to get my own emails back on this list on gEDA however it is the opposite. Nicklas Karlsson >Is it normal to NOT get your own emails back when posting to this > list? My settings on the mailserver have "Receive your own post to the > list?" set to "Yes" > > I'm

Re: [Emc-users] Desktops and OS's (Simplest possible)

The basic needs should be: Kernel with real time scheduler, X11 server for display unless it is run remotely, linuxcnc. I guess some more would be needed to get it started but not very much. Usually there are plenty of space on harddrive so any ordinary distrubution could be used with out any

Re: [Emc-users] Looping and axis

I have done programming with compiled languages and parsed row by row then executing. A main advantage of a compiler is the errors captured before execution. A button to check syntax, maximum velocity and maximum acceleration would probably be good. Nicklas Karlsson > my bad, > I thought

Re: [Emc-users] linuxcnc-dev in Synaptic when using uspace (was Carousel Component)

I downloaded the source and then figured out which packages wher needed for compilation then running "configure" script. Nicklas Karlsson On Thu, 5 Nov 2015 14:30:36 -0500 Rick Lair wrote: > Not to get too far off topic on my original thread, just wondering what > I

Re: [Emc-users] raid NAS

There are mirroring there two discs have the same content. There are raid with redundancy where one drive could be removed without loss of data, this configuration may also increase speed. Raid in software is possible but if all drive are on the same cable they have to share the bsndwidth but

Re: [Emc-users] Linux Mint

> I actually have no clue what real time kernel I want or what the > difference is between any of them. I would be using a 5i25 7ix6 combo. > > Thanks > JT I think linuxcnc print something about if real time posix is used then starting. If you have one installed try it and see if it seems good

[Emc-users] Profibus (Request Diagnostics)

I send yesterday to developer list but message seems to have disappeared so I here on user list insted. I am trying to get a profibus IO module up and running. Plan is to add to Linuxcnc and there plenty of these kind of devices out there so it will almost certainly be useful. Do anyone happen

Re: [Emc-users] Spindle Voltage?

It depends. For an asynchronous motor lower voltage will mean lower available torque although it is technically possible to get full torque up to there 208 volt is needed for full power but only if the inverter deliver 208 volt at this point. For a synchronous permanent magnet motor voltage is

Re: [Emc-users] Spindle Voltage?

> On Tue, Nov 3, 2015, at 09:41 AM, Todd Zuercher wrote: > > I recently purchased an inexpensive router spindle off of ebay. It is rated > > at 6kw and 380v 3ph. The old spindle I'm replacing was dual voltage and > > could be wired Y or delta, for 200-240 or 380-460 (7HP).

Re: [Emc-users] Spindle Voltage?

On Tue, 03 Nov 2015 08:54:32 -0600 Ed wrote: > On 11/03/2015 08:41 AM, Todd Zuercher wrote: > > I recently purchased an inexpensive router spindle off of ebay. It is rated > > at 6kw and 380v 3ph. The old spindle I'm replacing was dual voltage and > > could be wired Y or delta,

Re: [Emc-users] Optimum packing problem

> I wonder what the optimum packing is for a mixture of ER32, ER20, ER16 > and ER11 collets? > > A square array of ER32 with interstitial ER16, then a separate array > of ER20 with interstitial ER11? I would guess guess best packing would be like bee wax in three drawers.

Re: [Emc-users] Ethernet Hostmot2 (drop packets at init)

On Tue, 27 Oct 2015 20:31:54 -0500 Jeff Epler <jep...@unpythonic.net> wrote: > On Mon, Oct 12, 2015 at 10:50:07AM +0200, Karlsson & Wang wrote: > > Yes it works great! Do you think this should be part of standard behaviour? > > I talked to Seb about this change and we

Re: [Emc-users] [Emc-developers] Off topic question - Need help with remote cell phone data connection via site to site VPN

> ... They like to "control" the customer > even when they don't know what they are doing. I think an old sales person trick is to first check your "budget" or how much money you have available to spend then they find the most expensive you are likely to buy.

Re: [Emc-users] Debian install from live image

> Since Lucid has reached end of support I decided to back up my config and > install from the 2.7 live CD. > Having done that, installed all of the updates, and adjustments to my > config files,I ran the latency test. > Overall the latency numbers are 30% higher than the Lucid install, but >

Re: [Emc-users] help about I can't find the src file

I use 2.8 which are the latest available I have round and there is a file src/emc/kinematics/genhexkins.h for hexapod kinematics. I also have an hexapod out in garage but it is further down on my list of things to do. Nicklas Karlsson On Thu, 15 Oct 2015 17:07:05 +0800 "开心小八怪"

Re: [Emc-users] Rookie question - what to get to run LinCNC easily/inexpensively

> ... > Have you guys found anything in particular that might cause latency spikes > that I'm seeing? I installed 2.7-Wheezy from the pre-built live/install ISO > and I'm using the onboard video. No extra hardware besides a USB mouse and > keyboard. > Also, I'm planning to get a Mesa 5i25 so maybe

Re: [Emc-users] Ethernet Hostmot2 (drop packets at init)

Yes it works great! Do you think this should be part of standard behaviour? I would suggest to limit the number of sent messages and ideally used bandwidth at startup to the same as used during normal operation. I also feel I have to spend a few hour to help with this if needed. In a perfect

Re: [Emc-users] Hostmot2 (Use two cards)

Now it works, there where a few other issues to in particular the two devices had the same MAC adress. I actually need to have two rows: loadrt hostmot2 loadrt hm2_eth ... similar as your row below Regards Nicklas Karlsson > The "waitpid" error is a very generic error that indicates some >

[Emc-users] Hostmot2 (Use two cards)

I am trying to use two ethernet cards at the same time with the hostmot2 driver but get an error message "waitpid failed". I suspect this is because I try to load the low level driver twice, do anybody have an idea if this might be the case? Regards Nicklas Karlsson

Re: [Emc-users] AC Servo Motors

> Apparently DC Brushless cog but not AC ? > Anyway I'm about to order a 6N.m 1.8KW AC motor and drive for $340. It's > worth a try. > > Brushes ?? My South Western Industries mill has run 20+ hours a week for + 10 > years and I have never changed a brush. Maybe I should check sometime. > >

Re: [Emc-users] Hostmot2 drivers

> I am rebuilding a box with xubuntu 10.04 and the linuxcnc 2.5.4 install > script. I ran into a similar problem last April that Sebastian walked me > through. Rechecking those posts, the problem is a little different. While > linuxcnc installed fine, I do not see the hostmot2 drivers in synaptic.

Re: [Emc-users] Yaskawa or not

> ... And chances are that if you do the conversion, they will call > you when a drive goes down in the future. > > Dave Could rotate the motor with a drill or similar and measure the voltages with an oscilloscope?

Re: [Emc-users] multiple gcode streams in parallel

> .. > What would be useful in such a setup is an ability to pass information > directly from one LCNC host to another to coordinate functions such as > transferring a pallet with work on it to another machine for additional > operations. > > One example would be two machines doing an

Re: [Emc-users] multiple gcode streams in parallel

> ... > I now need to extend it to run two separate robots off the same linuxcnc > controller and receiver program. This brought up a question about the > python interface. Add an extra axis ? --

Re: [Emc-users] A lot of input/output. Cheap

> I've owned this machine quite a while, I know how it works. I'm not new in > the plastics arena as I started moulding in the early 90's. > This particular machine is made for vertical moulding, I can flip it as it > is. It takes me 15 minutes to re-arrange the setup for verticals and it > runs

Re: [Emc-users] Porting LinuxCNC(EMC) to Windows was CAD/CAM for LinuxCNC

> The machine hardware needs to be smart enough to monitor for > communication failures. There should be full duplex communication so > that every command either way is answered by an ACK. No response, it > shuts down. Real time data is usually sent periodically and in such other solutions are

Re: [Emc-users] R: A lot of input/output. Cheap

> Hi Sven. > It is a small machine but in any case I suggest to you to use a plc in stead > on LCNC. > I mean it is possibile to do it even with LCNC but will be much difficult. > I did many injection molding machine retrofit (the electric and Electronic > and software part) and a plc+hmi is

Re: [Emc-users] Need a computer (LinuxCNC & Mesa) Advice

> If it is for professional use, I would not get a refurb unit. Why take > someone else's problem for a few bucks. For the mini(itx,atx) systems, > cooling is the biggest issue. They tend to often focus on home media apps, > and they want the lowest sound, which means poor thermal management. I's

Re: [Emc-users] R: R: A lot of input/output. Cheap

> If you would like a 'personal" usage machine you can try what ever Solution > should work. > But if you are searching For a reliable industrial grade Solution you have to > spend some Money. This is my experience on that specific argument. Sometimes > cheap is not good. ;-) This is also my

Re: [Emc-users] A lot of input/output. Cheap

> > Hi Sven. > > Can you send a picture of the machine you have to retrofit ? > > Is it an injection moulding machine ? > > If yes how many tons is the closing clamp force and how many heating zones > > have the injection barrel/chamber ? > > > > Regards. > > > > Alex > > > > Here you go. >

Re: [Emc-users] Off topic. Open CV and Newts

Opencv http://opencv.org/ is the one i heard about. I am currently unemployed but have no experience with this, if not paid I am also busy with other things. On Tue, 22 Sep 2015 15:12:22 +0100 andy pugh wrote: > A friend is a professional newt-spotter. He is an ecologist

Re: [Emc-users] A lot of input/output. Cheap (Profibus)

> > > I think your suggestion with the HAL/Arduino library will be the cheapest > > > possible and more than good for this application, I will try it for sure! > > > With some small tweaks it will be fine for a Mega board and I should have > > > enough I/O. > > > Thanks! > > > > > > /S Profibus

Re: [Emc-users] A lot of input/output. Cheap (Profibus)

> Gentlemen, > be careful with Profibus, there are different tastes of it. Especially > the one designed for building automation will not very well suit our > needs. But, certainly, this is highly professional technology, extremely > noise proof even at long distances of several hundred meters.

Re: [Emc-users] A lot of input/output. Cheap (Profibus)

> I have used a lot of Profibus devices. I used to work for Siemens. > Profibus is very robust if installed properly.DP is the norm for > remote I/O. > PA is designed for the process industry and not nearly as common. > > I always thought that a chip was needed for a DP master.I don't >

Re: [Emc-users] Ethernet Hostmot2 (drop packets at init)

> > I am using the hostmot2 driver with ethernet and sometimes startup does not > > work properly. Then investegating further with wireshark I found that some > > packets seems to not be received correctly. I also found time between > > packages are very small at startup because they are sent

[Emc-users] Ethernet Hostmot2 (drop packets at init)

I am using the hostmot2 driver with ethernet and sometimes startup does not work properly. Then investegating further with wireshark I found that some packets seems to not be received correctly. I also found time between packages are very small at startup because they are sent as fast as the

Re: [Emc-users] CAD/CAM for LinuxCNC

> > So with MACH3 turning into a networked licensed (must be internet > > connected) The machine will not start without an internet connection ? -- ___ Emc-users mailing list

Re: [Emc-users] Cheap servos

How about usig a linear position sensor? On Thu, 3 Sep 2015 11:14:22 +0100 andy pugh wrote: > I wonder if these motor/drive combinations would work in a CNC application? > http://www.ebay.co.uk/itm/141744001054 > > I imagine that they run trapezoidal commutation and have

Re: [Emc-users] It looks like my encoder noise reducing filter is too laggy

By limiting the signal I guess you get "wind-up" in the integrator of the PID controller. I think there is a maximum acceleration option in the *ini which is better suited to limit acceleration. On Tue, 1 Sep 2015 15:12:05 -0400 Gene Heskett wrote: > Thinking that a direct

Re: [Emc-users] computing max acceleration for an actuator

PM, Jerry Scharf wrote: My question was the opposite. If you set the max acceleration lower than the actuator is capable of, I assume it will work fine and just take longer to ramp up to full speed than it could in theory. jerry On Thu, Aug 27, 2015 at 1:50 PM, Karlsson Wang

Re: [Emc-users] computing max acceleration for an actuator

If you try to accelerate the actuator above what the actuator is capable of the best thing that could happen is it will not keep track of the position and the other thing are more bad. On Thu, 27 Aug 2015 11:35:04 -0700 Jerry Scharf jsch...@finsix.com wrote: Hi, One last question about

Re: [Emc-users] Max spindle PWM frequency

It is implemented by a counter so then frequency is increased resolution go down. Som micro controllers have high resolution timers which get resolution equal to a counter at about a few giga hertz although I get the impression the extra high resolution is implemented a little bit different.

Re: [Emc-users] Max spindle PWM frequency

The micro controllers STM334 or XMC4xxx have high resolution timers equal to a frequency of up to a few gigz hertz. On Tue, 25 Aug 2015 09:43:38 + Marius Liebenberg mar...@mastercut.co.za wrote: Yes I though as much. I am running at 15us at the moment. I am thinking to use a MCU or a

Re: [Emc-users] Max spindle PWM frequency

I have not checked the AVR but most micro controllers have timers with hardware support or duty cycle measurement. XMC4xxx or STM334 devopment boards have high resolution timers equal to a frequency about a few gigahertz. On Tue, 25 Aug 2015 21:09:08 +1000 Erik Christiansen

Re: [Emc-users] Spurious machine state changes, updates

If I remember correctly I heard somewhere stop is not allowed to be a toggle button. Regards Nicklas Karlsson On Tue, 11 Aug 2015 08:06:51 -0400 lloyd wilson llwilso...@rochester.rr.com wrote: I think I've solved the state change conundrum I asked about last week - While watching the

Re: [Emc-users] Wire EDM

I have an old Sodick wire EDM I should give a try at home, it never booted properly probably because a problem with the discettes. On Fri, 7 Aug 2015 10:40:08 +0100 andy pugh bodge...@gmail.com wrote: I just found this on YouTube https://www.youtube.com/watch?v=qoV8UXtLYmE I though that

Re: [Emc-users] Wire EDM

I have an old Sodick wire EDM I should give a try at home, it never booted properly probably because a problem with the discettes. On Fri, 7 Aug 2015 10:40:08 +0100 andy pugh bodge...@gmail.com wrote: I just found this on YouTube https://www.youtube.com/watch?v=qoV8UXtLYmE I though that

Re: [Emc-users] Encoder filtering

I guess these defects may be available although much smaller even on a perfect encoder. TTL circuits quite usually have quite different rise and fall time but I even though i did not measure I guess it may be the same for CMOS circuits. I also expect less than perfect phase shift but I may be

Re: [Emc-users] Gear hobbing machine

I guess you have start calculation from the encoder counters each time and then there will be no problem with add up over time. Nicklas Karlsson On Thu, 30 Jul 2015 09:44:02 -0400 John Kasunich jmkasun...@fastmail.fm wrote: On Wed, Jul 29, 2015, at 09:35 PM, richsh...@comcast.net wrote:

Re: [Emc-users] Switches for home, limits

A simple RC filter possibly combined with voltage division will remove noise although it will also reduce accuracy. I think low input impedance will fix the problem with noise because even though voltage may be high only a limited amount of current may be transferred by capacitive coupling or

Re: [Emc-users] Gear hobbing machine

Sounds great. I bough a few hundred kilos of material probably intented for gears from bankcrupt company which i intend to use for testing machine. Nicklas Karlsson On Thu, 30 Jul 2015 10:09:51 +0100 andy pugh bodge...@gmail.com wrote: On 30 July 2015 at 07:16, Dave Caroline

Re: [Emc-users] minimum spindle speed

If spindle motor is an asynchronous motor and simple voltage frequency control. Are your sure voltage frequency characteristics are correctly set? If motor get hot on low RPM even then not loaded you will almost certainly use to high voltage. Nicklas Karlsson On Mon, 22 Jun 2015 13:48:23

[Emc-users] Ethernet --Ethercat (was Serial FPGA buses/interconnections)

For ordinary Ethernet there cheap development boards available with an Ethernet connector. I use the 7i80 but will change to standard protocol as soon as there is time. Ethercat require two Ethernet connectors and as signals are changed while passing thru also special hardware. As is now I

Re: [Emc-users] Serial FPGA buses/interconnections [Was: Sandy box]

I am already using the 7i80 code on Micro controller although currently only running on desktop with servo motor from real machine. Nicklas Karlsson On Mon, 8 Jun 2015 17:07:36 + Ralph Stirling ralph.stirl...@wallawalla.edu wrote: Philipp, You should look at the ethernet-based system

Re: [Emc-users] If there's one thing I hate, all the noise, noise, noise, noise

I guess a common mode filter will be good but I have almost only theoretical knowledge and very limited experience. Nicklas Karlsson On Thu, 14 May 2015 10:38:43 -0400 Rick Lair r...@superiorroll.com wrote: I have been following this thread somewhat, and have a question, What is the

Re: [Emc-users] If there's one thing I hate, all the noise, noise, noise, noise

I forgot to mention. There is a capacitance between motor cables and protective earth. Then the motor is driven by the VFD it is supplied with square wave voltages at high frequency and at each switching the capacitance is discharged or charged. As impedance at high frequency is far from zero

Re: [Emc-users] If there's one thing I hate, all the noise, noise, noise, noise

Grounding. Power ground must be separated from small signal ground. The VFD also generate a common mode voltage and unless a common mode inductor is added to increase common mode impedance there will be a high frequency current flowing thru the protected earth wire which in combination with the

Re: [Emc-users] Servo Motor Question

Mechanical problem? On Mon, 11 May 2015 11:10:52 -0400 Rick Lair r...@superiorroll.com wrote: Its Linuxcnc controlled, and has been running fine for over a year, the operators started noticing a poor finish on the parts just as of recent. The material is hardened D2 Tool steel, and we are

Re: [Emc-users] Mesa cards visual documentation

, Karlsson Wang wrote: Hierchical design in Geda is not to bad. In particular it is possible to make several instances of same component which is a sub sheet. Naming of components on PCB is however horrible long. Nicklas Karlsson On Mon, 20 Apr 2015 23:05:03 +0100 andy pugh bodge

Re: [Emc-users] Mesa cards visual documentation

Hierchical design in Geda is not to bad. In particular it is possible to make several instances of same component which is a sub sheet. Naming of components on PCB is however horrible long. Nicklas Karlsson On Mon, 20 Apr 2015 23:05:03 +0100 andy pugh bodge...@gmail.com wrote: On 20 April

Re: [Emc-users] Mesa cards visual documentation

scale and how to handle threads. in general the drawings are just too big the idea needs to have 'meta' components so the complexity can be reduced ( like pages in hierarchical schematics) hth TomP tjtr33 On 04/20/2015 03:49 PM, Karlsson Wang wrote rockhopper geda eagle may

Re: [Emc-users] Mesa cards visual documentation

to be integrated this is the second step. Nicklas Karlsson On Sun, 19 Apr 2015 20:58:45 -0500 TJoseph Powderly tjt...@gmail.com wrote: On 04/19/2015 01:40 PM, andy pugh wrote: On 19 April 2015 at 18:31, Karlsson Wang nicklas.karls...@karlssonwang.se wrote: I guess it would be possible

Re: [Emc-users] Need a SWAG

Increase in speed should almost certainly be 48/28 faster. I think this is true for acceleration to. Then you just have to hope for the electric motor to tolerate the higher voltage and for the mechanics to tolerate higher speed/acceleration. Nicklas Karlsson On Sat, 18 Apr 2015 21:02:22

Re: [Emc-users] Mesa cards visual documentation

The *.hal files fulfill a similar functionality as a netlist in schematic capture software. Difference is signals exist in software instead of on a circuit board. I guess it would be possible to modify or make Linuxcnc accept a netlist as a hal file and in such case for example Geda could be

Re: [Emc-users] Need a SWAG

Oh i didn't think about stepper. The equations are useful for DC, BLDC, PMSM, Asyncronous and probably also for switched reluctance. On Sun, 19 Apr 2015 14:19:04 -0400 Gene Heskett ghesk...@wdtv.com wrote: On Sunday 19 April 2015 10:22:40 Karlsson Wang wrote: Motor torque depends

Re: [Emc-users] Mesa cards visual documentation

Then I am not stupid. I guess hierarchical design in particular and buses may help. Rockhopper? Bicycles? Or the Rockhopper penguin? Nicklas Karlsson On Sun, 19 Apr 2015 19:40:46 +0100 andy pugh bodge...@gmail.com wrote: On 19 April 2015 at 18:31, Karlsson Wang nicklas.karls

Re: [Emc-users] Mesa cards visual documentation

Then I am not stupid. I guess hierarchical design in particular and buses may help. Rockhopper? Bicycles? Or the Rockhopper penguin? Nicklas Karlsson On Sun, 19 Apr 2015 19:40:46 +0100 andy pugh bodge...@gmail.com wrote: On 19 April 2015 at 18:31, Karlsson Wang nicklas.karls

Re: [Emc-users] Mesa cards visual documentation

For cabinets it would be useful to count the number of connection points for each net, one screw connector for each for those who need screws. Nicklas Karlsson On Sun, 19 Apr 2015 19:40:46 +0100 andy pugh bodge...@gmail.com wrote: On 19 April 2015 at 18:31, Karlsson Wang nicklas.karls

Re: [Emc-users] WTF is wrong here

Well you have to add drainage on the outside! It might also be good with a layer insulation.

Re: [Emc-users] Not ACME, ballscrews! Re: Anyone have leftovers from a 9x20 CNC conversion?

I have a left over ball screw but do not know the price for these, It is around 2.5 metres long and I bought it used for below $100 On Sat, 28 Mar 2015 23:52:59 -0600 Gregg Eshelman g_ala...@yahoo.com wrote: On 3/28/2015 8:46 AM, Gene Heskett wrote: I need to be finding some good ACME rod

Re: [Emc-users] Velocity closed loop + Position losed loop on an axis

Sounds good. On Fri, 27 Mar 2015 20:54:31 + andy pugh bodge...@gmail.com wrote: On 27 March 2015 at 20:44, Karlsson Wang nicklas.karls...@karlssonwang.se wrote: It is possible, i can't see it anymore. As I understand it, the encoder edges are timestamped by either the system clock

Re: [Emc-users] Velocity closed loop + Position losed loop on an axis

It is possible, i can't see it anymore. On Thu, 26 Mar 2015 21:46:27 + andy pugh bodge...@gmail.com wrote: On 26 March 2015 at 21:10, Karlsson Wang nicklas.karls...@karlssonwang.se wrote: Quite many pulses need to be counted and servo thread is run quite often. For eight bit

Re: [Emc-users] Velocity closed loop + Position losed loop on an axis

March 2015 19:02:16 Karlsson Wang wrote: To get higher accuracy you need more accurate measurement, some extra resolution above the accuracy is also useful. For better dynamic perfomance it may make sense to close the inner loop if the inner loop is faster than the outer loop

Re: [Emc-users] Velocity closed loop + Position losed loop on an axis

Do the math. Accuracy is bad at low speed and there is a lower limit on speed. Is number of pulses counted to give speed? Is time between pulses measured to give speed? Nicklas Karlsson On Wed, 25 Mar 2015 23:59:02 -0300 Leonardo Marsaglia leonardomarsagli...@gmail.com wrote: 2015-03-25

Re: [Emc-users] Velocity closed loop + Position losed loop on an axis

Quite many pulses need to be counted and servo thread is run quite often. For eight bit resolution which is rather low 256 pulses must be counted in the time delta there speed is measured. Nicklas Karlsson On Thu, 26 Mar 2015 13:23:29 -0700 (PDT) Peter C. Wallace p...@mesanet.com wrote:

Re: [Emc-users] Velocity closed loop + Position losed loop on an axis

To get higher accuracy you need more accurate measurement, some extra resolution above the accuracy is also useful. For better dynamic perfomance it may make sense to close the inner loop if the inner loop is faster than the outer loop. If the electic response is much faster than the

Re: [Emc-users] VFD causing limits to trip. Huh?

The problem is there are no low impedance ground available. The mains power cable ground is not low impedance at high frequency and the common mode voltage of inverters will couple a high frequency current into the ground cable. The trick usually used is to isolate logical ground and increase

[Emc-users] Point Of Sale (POS) terminal as CNC computer

Have anyone tried these POS terminals with touch screen as a CNC computer? Nicklas Karlsson -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with

Re: [Emc-users] VFD causing limits to trip. Huh?

I also agree about this. Nicklas Karlsson On Wed, 18 Mar 2015 12:43:16 -0500 Steve Stallings steve...@newsguy.com wrote: If one is trying to minimize radiated interference from a signal source, then grounding the shield at the source end makes sense. My suggestion of grounding the

Re: [Emc-users] PCB adapters for oscilloscope probes

It is possible to hold probe a little bit above the point, amplitude will however not be accurate. Rugoski coil is also useful for high frequency measurements of currents but not low frequency or DC. Nicklas Karlsson On Tue, 17 Mar 2015 22:21:45 +0100 Philipp Burch p...@hb9etc.ch wrote:

Re: [Emc-users] VFD causing limits to trip. Huh?

to control signal ground. There exist true sinus output but I think all of them are sold as true sinus for a higher price. Nicklas Karlsson On Mon, 16 Mar 2015 22:19:42 +0100 Bertho Stultiens ber...@vagrearg.org wrote: On 03/16/2015 09:40 PM, Karlsson Wang wrote: A shield is primarily

Re: [Emc-users] VFD causing limits to trip. Huh?

: [Emc-users] VFD causing limits to trip. Huh? Are the shielded wires only grounded at one end and at the controller end? On Sun, Mar 15, 2015 at 1:22 PM, Karlsson Wang nicklas.karls...@karlssonwang.se wrote: I think grounding is the most important. There are normally

Re: [Emc-users] Ethernet!

) Peter C. Wallace p...@mesanet.com wrote: On Sun, 15 Mar 2015, Karlsson Wang wrote: Date: Sun, 15 Mar 2015 20:03:56 +0100 From: Karlsson Wang nicklas.karls...@karlssonwang.se Reply-To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net To: Enhanced Machine Controller

Re: [Emc-users] VFD causing limits to trip. Huh?

I think grounding is the most important. There are normally a common mode voltage at the inverter output to motor so the inverter power ground will bounce around each time inverter is switched. If this bouncing is coupled to the logic ground there may be a lot of problems. Nicklas Karlsson

Re: [Emc-users] Ethernet!

: On Sun, 15 Mar 2015, Karlsson Wang wrote: Date: Sun, 15 Mar 2015 18:34:13 +0100 From: Karlsson Wang nicklas.karls...@karlssonwang.se Reply-To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net To: Klemen Dovrtel klemen_dovr...@yahoo.com, Enhanced Machine

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