Re: [Emc-users] 5-axis table-table kinematics: G54 offsets
2011/12/28 Rudy du Preez r...@asmsa.co.za It is in groups.yahoo.com under group SA-CNC-CLUB in photos. I tried searching Sorry, no matches were found for SA CNC CLUB Andrew -- Write once. Port to many. Get the SDK and tools to simplify cross-platform app development. Create new or port existing apps to sell to consumers worldwide. Explore the Intel AppUpSM program developer opportunity. appdeveloper.intel.com/join http://p.sf.net/sfu/intel-appdev ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] 5-axis table-table kinematics: G54 offsets
2011/12/28 Rudy du Preez r...@asmsa.co.za: In a recent posting I did say where photo's of my machine and an impeller cut with it can be looked at. It is in groups.yahoo.com under group SA-CNC-CLUB in photos. This is the discussion group for our local CNC club (South Africa), which I started about 2 years ago (SA-CNC-CLUB) and has about 40 members. Ok, You did mention the Yahoo group. AFAIK only group members can view posted pictures. But I was not able to check that for sure, because I did not find the group, see this link: http://groups.yahoo.com/search?query=sa-cnc-clubsort=relevance I have not been able to find a way to post photos to this forum. Yes, e-mail attachments are not encouraged, it is better to post pictures somewhere with a public access, like Google's Picasa. I guess that pastebin.com also accepts pictures. Lets focus a little on the process of going from world coordinates to joint coordinates. Starting from a toolpoint position in part or world coordinates xyz and unit tool vector ijk, these have to be transformed to joint coordinates XYZAC, with C the rotation angle of the top rotary table and A the rotation angle of the rotary table on which the top rotary table sits. The rotary axis of the A table is along the X-axis of the machine. X sits on Y which sits on Z (look at my pictures if necessary). Ok, I finally understood, how the joints are alligned in Your machine. The world coordinates I supply to EMC is the original xyz and the two angles A and C which have been computed in the CAM post-processor from ijk by: A = -arccos(k) and C = arctan2(i,j) Some adjustment of C is necessary to go beyond -180 deg and +180 deg. This is transformed by the inversekins: J0 = cos(C)*x - sin(C)*y j1 = sin(C)*cos(A)*x + cos(C)*cos(A)*y - sin(A)*z j2 = sin(C)*sin(A)*x + cos(C)*sin(A)*y + cos(A)*z j3 = A j4 = b (not used) j5 = C This is a working process for me so far as you can see from the photo of the impeller produced. Ok, I need You to expand on this in more details. Where are these formulas used? 1) In postprocessor of Your CAM program? 2) In Your custom kinematics module? 3) Somewhere else? If I use a G55 transformation of say G55 x10 y10, then EMC seems to add these values to x and y before it sends it to inversekins. The world coordinate origin is shifted to the new position. That seems fine. G55 is set by a G10 L2 P2 command. If I use a G55 of say G55 c45 nothing happens. It would have worked for me if EMC also added 45 to the value of C before it passes it on to inversekins. Practically I would only want to shift the C-axis when cutting parts like impellers with a number of blades. The GCODE for only one blade is the provided. Does EMC produce correct blade with the g-code for a single blade with trivkins module? If yes, can You check, if this approach is working (again - with trivkins module): 1) Save the blade's g-code in a separate file with the name o100.ngc; in that file define subroutine, just like the example You already provided: o100 sub G0 x25 y0 G1 x30 f200 G1 y5 G1 x25 G1 y0 o100 endsub 2) Create another file, which will call subroutines for each blade and rotate the top rotary table: a) place the tool in part's coordinate origin either by jogging or by a move in machine's coordinates, because I suspect that part's origin will be in the center of C joint and since You should know the location of C joint in machine coordinates, You can easily get there with (X,Y, Z numbers are random): G53 G0 X123 Y 123 Z123 A0 C0 b) zero G54 coordinates and select them: G10 L2 P1 x0 y0 z0 a0 c0 G54 G0 x0 y0 C0 c) call subroutine, produce the blade and rotate the C for 51.43: o100 call G0 X0 Y0 Z0 A0 C51.43 d) zero G54 again and do the next blade: G10 L2 P1 X0 Y0 Z0 A0 C0 o100 call e) I apologize beforehand for any mistakes in this code, as I myself actually have never used subroutines. I could also have passed on the ijk values as abc values to the inversekins. It would then have to work out the AC values, but there is quite a bit of checking and adjustment to C to be done. I am not sure if EMC could then pass on transformations. What is that You want to achieve with this? I feel pretty confident about my math skill and what I feel about Your formulas is that You are trying to implement things that I do not see that You need. You are adding the compensating moves along X, Y and Z so that tool stays at the same point of the part, when A or C joints are rotated. Actually that is very useful thing, because then parts that require complex 5-axis machining can be programmed a lot more easily, sometimes even by hand. Anyway, that would almost eliminate need for CAM postprocessor. That is very nice and extremely useful, but since You never mentioned that this is Your goal, I do not understand, why are You spending Your effort on this. Viesturs -- Write once.
Re: [Emc-users] SA-CNC-CLUB
The full link to the group is: tech.groups.yahoo.com/group/sa-cnc-club You may have to register to be able to access the photos. Sign on - you can always de-register afterwards. Rudy -- Write once. Port to many. Get the SDK and tools to simplify cross-platform app development. Create new or port existing apps to sell to consumers worldwide. Explore the Intel AppUpSM program developer opportunity. appdeveloper.intel.com/join http://p.sf.net/sfu/intel-appdev ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] 5-axis table-table kinematics: G54 offsets
On 28 Dec 2011, at 05:52, Rudy du Preez r...@asmsa.co.za wrote: If I use a G55 of say G55 c45 nothing happens. ... I hope the problem is now clearer and look forward to some response Yes, I now understand that you want to pass a tool XYZAC to the G code and have EMC2 convert the A and C to movements in joints 3 and 5. I am assuming that when you say g55 c45 that is a shorthand for g10 L2 C45 / g55? I am fairly sure that an axis word on the same line an a G55 is simply interpreted as a movement, and will be fast or slow dependent on whether G1 or G0 is active. I think the complication in your case is that you want to index explicitly in joint 5 not in World C to move from vane to vane, the G55 offset can only ever be in tool angle. I think that your vane-to-vane indexing will need to be an extra pin input into your kinematics routine. (or alternatively an offset component in the HAL between the position-command and the stepgen or pid. ) -- Write once. Port to many. Get the SDK and tools to simplify cross-platform app development. Create new or port existing apps to sell to consumers worldwide. Explore the Intel AppUpSM program developer opportunity. appdeveloper.intel.com/join http://p.sf.net/sfu/intel-appdev ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] 5-axis table-table kinematics: G54 offsets
I have found a way to do rotational shifts of the C-axis using XYZACkins. I use the B-axis for that and just program G0 Bxx at the start of each blade of the impeller, where xx is the absolute position of each blade; ie 0, 90, 180, 270 for 4 blades. The B position is available and free to use in the kinematics program. I use it and subtract it from the given C value coming from EMC in the inversekins and use the joint[4] value and add to the joint[5] value in the forwardkins. It may not be the most elegant way, but it works and I now only have to supply Gcode for one blade in a subroutine. I would not be able to have EMC do it beforehand with a G54 to G59 command, since I need the unshifted C-value from EMC as well as the shift value (in my case now B). The machine is now a 6-axis machine XYZABC with the B axis just used for rotational shifts of C! I suppose there are also other ways to do it such as using G43.1 instead of a B-axis. Thanks everybody for the discussions and help on this. It always amazes me how flexible EMC2 is. Marvelous! Rudy -- Write once. Port to many. Get the SDK and tools to simplify cross-platform app development. Create new or port existing apps to sell to consumers worldwide. Explore the Intel AppUpSM program developer opportunity. appdeveloper.intel.com/join http://p.sf.net/sfu/intel-appdev ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] stepper power supply
I have a 40v 10amp power supply from Probotix I asked this question of supp...@probotix.com I have used your 40 volt 10 amp power supply for over a year with 3 of your yellow motors (3 ammps each) I just added a 4th driver to my controller with the intent of adding a 4th 3 amp motor for a rotary table How is the 10 amp power supply going to handle 4 - 3 amp motors Am i looking for trouble I got this response The 40V 10Amp power supply is more than capable of handling all 4 drivers running the 3 amp motors. The formula breaks down like this: 3A x 4 x 60% = 7.2 amps This would be what your draw would be on the power supply. Would someone elaborate on this just a bit I am not questioning their response I just do not understand it Richard ps - I tend to bring many non-emc related questions to this list If there is a more appropriate place please point me to it -- Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex infrastructure or vast IT resources to deliver seamless, secure access to virtual desktops. With this all-in-one solution, easily deploy virtual desktops for less than the cost of PCs and save 60% on VDI infrastructure costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] stepper power supply
I assume all my steppers are using all the amps I want them to, which would be 12A if I was using 4 steppers at 3A ea. But probotix is probably assuming some reduction in current while stationary this can lead to loss of position when powered down to a lower current (it may be a requirement if insufficient heatsink is provided). This may be ok for some operations but not all. Dave Caroline -- Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex infrastructure or vast IT resources to deliver seamless, secure access to virtual desktops. With this all-in-one solution, easily deploy virtual desktops for less than the cost of PCs and save 60% on VDI infrastructure costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] stepper power supply
On 28 Dec 2011, at 15:52, kqt4a...@gmail.com wrote: Would someone elaborate on this just a bit I am not questioning their response I just do not understand it I suspect that the 60% might be a diversity factor. www.wikipedia.org/wiki/Diversity_factor -- Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex infrastructure or vast IT resources to deliver seamless, secure access to virtual desktops. With this all-in-one solution, easily deploy virtual desktops for less than the cost of PCs and save 60% on VDI infrastructure costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] stepper power supply
On Wednesday, December 28, 2011 11:21:24 AM kqt4a...@gmail.com did opine: I have a 40v 10amp power supply from Probotix I asked this question of supp...@probotix.com I have used your 40 volt 10 amp power supply for over a year with 3 of your yellow motors (3 ammps each) I just added a 4th driver to my controller with the intent of adding a 4th 3 amp motor for a rotary table How is the 10 amp power supply going to handle 4 - 3 amp motors Am i looking for trouble I got this response The 40V 10Amp power supply is more than capable of handling all 4 drivers running the 3 amp motors. The formula breaks down like this: 3A x 4 x 60% = 7.2 amps This would be what your draw would be on the power supply. Would someone elaborate on this just a bit I am not questioning their response I just do not understand it Richard Each motor may have a 3 amp current flowing, but due to the current regulation of the chopper in the driver, with its free-wheeling diodes effect, much of that 3 amp current is circulating current between the motor and its driver, with, when the motor is stationary, only perhaps 400 milliamps actually coming from the supply when averaged. Enough to make up for the resistive heating losses in the motor and driver. Steppers working hard at higher rpms will draw more, but in the real world all 4 motors will never be running full speed continuously. If you could put a meter into the line and measure it (not recommended because the inductance of the meter will mess with the chopper waveforms back and forth into the supplies output filter capacitor, and that could destroy a driver package from overvoltage spikes on its supply input) I would doubt very seriously that you would ever see more than 4-6 amps to run all 4 motors at a good clip. There are hall effect based ammeters that could measure the current this current without the inductive effects, but they are above the range of everyone having one in his tool kit, purely laboratory instruments that in 60+ years of troubleshooting electronics, I have never felt crippled by not having one of them in my kit. As the folks here have taught me quite a few times, the cat has more than 9 lives because there are usually more than 9 ways to skin him. One can often get answers for this sort of problems from the display of an oscilloscope if you know how to read what it is telling you. IOW you should be fine. ps - I tend to bring many non-emc related questions to this list If there is a more appropriate place please point me to it While this could be OT for this list, it is not OT for quite a few of us here. I am more than happy to teach a wee bit about electronic subjects where I have some BTDT experience with them. Trying to pay back for some of the help that the real machinists here have given me over the years. Backscratching as it were. It is mutually pleasurable. :) 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) My web page: http://coyoteden.dyndns-free.com:85/gene Well, O.K. I'll compromise with my principles because of EXISTENTIAL DESPAIR! -- Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex infrastructure or vast IT resources to deliver seamless, secure access to virtual desktops. With this all-in-one solution, easily deploy virtual desktops for less than the cost of PCs and save 60% on VDI infrastructure costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Live CD
I have downloaded and burnt the Live CD 10.04. It has worked on one desktop I tried but not on another or my laptop. I only have the laptop with me at the moment so I would like to install Ubuntu and EMC to find out more in conjunction with reading all the EMC manuals I have printed out. The laptop is a Panansonic Toughbook CF29,Windows XP,Pentium 4,756Mb ram. From the users emails over the last few days I tried the ctrl/alt/f1and have experimented with the f6 boot options. The laptop appears to boot to a certain point and then the screen goes blank and then 'hangs' with the power off button being the only option. If I delete splash-- and replace it with vga=771 then the display remains on and the laptop 'hangs' on pulseaudio configured for per-user sessions line. I have tried some of the other f6 suggestions but not all as yet (I will wear the power button out soon). I don't know if I can add the options sequentially to the boot line or only use one at a time. Does anybody have any suggestions rather than me working through all the f6 options without really knowing which maybe causing the boot problem ? Tim Sent from my BlackBerry® wireless device -- Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex infrastructure or vast IT resources to deliver seamless, secure access to virtual desktops. With this all-in-one solution, easily deploy virtual desktops for less than the cost of PCs and save 60% on VDI infrastructure costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] stepper power supply
chopped 3A means 3A AVERAGE the peak is much higher Dave Caroline -- Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex infrastructure or vast IT resources to deliver seamless, secure access to virtual desktops. With this all-in-one solution, easily deploy virtual desktops for less than the cost of PCs and save 60% on VDI infrastructure costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] stepper power supply
2011/12/28 kqt4a...@gmail.com: I got this response The 40V 10Amp power supply is more than capable of handling all 4 drivers running the 3 amp motors. The formula breaks down like this: 3A x 4 x 60% = 7.2 amps This would be what your draw would be on the power supply. Would someone elaborate on this just a bit I am not questioning their response I just do not understand it When stepper motor is moving, current in the windings is turned on and off, it fluctuates from 0 to 3A and back, so overall current does not reach 3A, but is somewhere inbetween. There are stepper drives, that are doing this also when motor is not moving, probably their drives are doing this. BTW I used Gecko drives for one of my machines. Their manual says that drive will draw 67% of motor winding current from the power supply. If motors are set (with DIP switches or resistor) for 3A, it will draw ~2A from power supply. Viesturs -- Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex infrastructure or vast IT resources to deliver seamless, secure access to virtual desktops. With this all-in-one solution, easily deploy virtual desktops for less than the cost of PCs and save 60% on VDI infrastructure costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] stepper power supply
On Wednesday, December 28, 2011 12:05:13 PM Dave Caroline did opine: I assume all my steppers are using all the amps I want them to, which would be 12A if I was using 4 steppers at 3A ea. Not so Dave. For modern chopper stabilized current controlling drivers, the power supply is only supplying the resistance and eddy current losses in the motor and driver. Worst case for really old motors with lossy iron might be 50% of the nameplate current that actually comes from the supply _once_ the current setting has been reached at initial power-up. But probotix is probably assuming some reduction in current while stationary this can lead to loss of position when powered down to a lower current (it may be a requirement if insufficient heatsink is provided). I have been amazed at how cool my motors run on the MM-542 drivers, and equally amazed at the torque it takes to turn them a full step when powered down to 50% current when idle. Yes, I _can_ turn them but they will not get moved by accident... Brushing an arm or belly against the resonance damper while hand changing tooling sure isn't going to do it. This may be ok for some operations but not all. Dave Caroline 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) My web page: http://coyoteden.dyndns-free.com:85/gene We'll know that rock is dead when you have to get a degree to work in it. -- Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex infrastructure or vast IT resources to deliver seamless, secure access to virtual desktops. With this all-in-one solution, easily deploy virtual desktops for less than the cost of PCs and save 60% on VDI infrastructure costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] stepper power supply
On Wednesday, December 28, 2011 12:20:36 PM Andy Pugh did opine: On 28 Dec 2011, at 15:52, kqt4a...@gmail.com wrote: Would someone elaborate on this just a bit I am not questioning their response I just do not understand it I suspect that the 60% might be a diversity factor. www.wikipedia.org/wiki/Diversity_factor From that article and its assumptions, I believe is where the term SWAG came from? ;-) 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) My web page: http://coyoteden.dyndns-free.com:85/gene To say you got a vote of confidence would be to say you needed a vote of confidence. -- Andrew Young -- Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex infrastructure or vast IT resources to deliver seamless, secure access to virtual desktops. With this all-in-one solution, easily deploy virtual desktops for less than the cost of PCs and save 60% on VDI infrastructure costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Live CD
On Wednesday, December 28, 2011 12:24:02 PM Tim James did opine: I have downloaded and burnt the Live CD 10.04. It has worked on one desktop I tried but not on another or my laptop. I only have the laptop with me at the moment so I would like to install Ubuntu and EMC to find out more in conjunction with reading all the EMC manuals I have printed out. The laptop is a Panansonic Toughbook CF29,Windows XP,Pentium 4,756Mb ram. No knowledge of that one. From the users emails over the last few days I tried the ctrl/alt/f1and have experimented with the f6 boot options. The laptop appears to boot to a certain point and then the screen goes blank and then 'hangs' with the power off button being the only option. If I delete splash-- and replace it with vga=771 then the display remains on and the laptop 'hangs' on pulseaudio configured for per-user sessions line. Someone needs to tell you how to skip pulse, I believe it can be done but I've never had to get out that big a hammer. I have tried some of the other f6 suggestions but not all as yet (I will wear the power button out soon). :) There are pretty durable, my old hp dv-5120-us has a lot of use, still fine. I don't know if I can add the options sequentially to the boot line or only use one at a time. Generally you can use a whole bunch of the options, that buffer is at least a full kilobyte. Does anybody have any suggestions rather than me working through all the f6 options without really knowing which maybe causing the boot problem ? Tim Sent from my BlackBerry® wireless device -- Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex infrastructure or vast IT resources to deliver seamless, secure access to virtual desktops. With this all-in-one solution, easily deploy virtual desktops for less than the cost of PCs and save 60% on VDI infrastructure costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users 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) My web page: http://coyoteden.dyndns-free.com:85/gene To say you got a vote of confidence would be to say you needed a vote of confidence. -- Andrew Young -- Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex infrastructure or vast IT resources to deliver seamless, secure access to virtual desktops. With this all-in-one solution, easily deploy virtual desktops for less than the cost of PCs and save 60% on VDI infrastructure costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Live CD
Hi Download the 8.04 cdimage and install that. If you want a newer version of EMC you can install that onto 8.04. A lot of things have changed from version 9.10 of Ubuntu onwards, that do not make it ideal for older hardware. I have 8.04 running happily on 2 P4 desktops in the workshop, with a RIP build of EMC 2.6. http://www.linuxcnc.org/hardy/ubuntu-8.04-desktop-emc2-aj13-i386.iso regards -- Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex infrastructure or vast IT resources to deliver seamless, secure access to virtual desktops. With this all-in-one solution, easily deploy virtual desktops for less than the cost of PCs and save 60% on VDI infrastructure costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Live CD
On 12/28/2011 09:06 AM, Tim James wrote: I have downloaded and burnt the Live CD 10.04. It has worked on one desktop I tried but not on another or my laptop. I only have the laptop with me at the moment so I would like to install Ubuntu and EMC to find out more in conjunction with reading all the EMC manuals I have printed out. The laptop is a Panansonic Toughbook CF29,Windows XP,Pentium 4,756Mb ram. what's more important to know is which chipset video and CPU are in there. From the users emails over the last few days I tried the ctrl/alt/f1and have experimented with the f6 boot options. The laptop appears to boot to a certain point and then the screen goes blank and then 'hangs' with the power off button being the only option. If I delete splash-- and replace it with vga=771 then the display remains on and the laptop 'hangs' on pulseaudio configured for per-user sessions line. I have tried some of the other f6 suggestions but not all as yet (I will wear the power button out soon). I don't know if I can add the options sequentially to the boot line or only use one at a time. Does anybody have any suggestions rather than me working through all the f6 options without really knowing which maybe causing the boot problem ? Tim First try to see if you can install it in text mode only. Next would be Ubuntu 11.x to see if it works better or you could try perhaps kubuntu version. If not then try a different distribution altogether. I would try debian as ubuntu is based on it. One other option is to try virtual installation inside XP to see if that works. RT will not work of course, but you can still test basic EMC functionality. Installing virtualbox from Oracle takes only a few minutes. -- Rafael -- Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex infrastructure or vast IT resources to deliver seamless, secure access to virtual desktops. With this all-in-one solution, easily deploy virtual desktops for less than the cost of PCs and save 60% on VDI infrastructure costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] stepper power supply
The reason they state 67% is because they are not getting the full torque from the motor They are not fully powering both windings and there is an assumption that the motors are not all in the same phase so some windings are partially powered. for full step and full power you power both windings fully. see half step and microstep sections http://en.wikipedia.org/wiki/Stepper_motor Dave Caroline -- Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex infrastructure or vast IT resources to deliver seamless, secure access to virtual desktops. With this all-in-one solution, easily deploy virtual desktops for less than the cost of PCs and save 60% on VDI infrastructure costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] stepper power supply
Well I guess if y'all are going to explain it like that then even I can understand it :) Thanks Richard -- Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex infrastructure or vast IT resources to deliver seamless, secure access to virtual desktops. With this all-in-one solution, easily deploy virtual desktops for less than the cost of PCs and save 60% on VDI infrastructure costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Hal comp.
Hi all, I need to compare if a value is or of another, i think i may use the comp realtime component, but i can't find how to use that. is there an example you know about? thanks, Davide. -- Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex infrastructure or vast IT resources to deliver seamless, secure access to virtual desktops. With this all-in-one solution, easily deploy virtual desktops for less than the cost of PCs and save 60% on VDI infrastructure costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Hal comp.
Il giorno gio, 29/12/2011 alle 00.35 +0100, Spiderdab ha scritto: Hi all, I need to compare if a value is or of another, i think i may use the comp realtime component, but i can't find how to use that. is there an example you know about? thanks, Davide. Sorry, i 've found the solution looking at new pins. comp.0.out is true when in1in0 and false when in1=in0. thanks! -- Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex infrastructure or vast IT resources to deliver seamless, secure access to virtual desktops. With this all-in-one solution, easily deploy virtual desktops for less than the cost of PCs and save 60% on VDI infrastructure costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] stepper power supply
Sorry, but a different opinion here Gecko publishes the 67% number based on real world experience with a large number of motors and power supplies tested. The reality of calculating the current needed is daunting. First you start by looking at power, which is what is really being delivered. The Gecko drivers are modern chopping drivers which behave somewhat like a switching power supply. They convert a high voltage moderate current into a lower voltage at a higher, but regulated, current to drive the motor. For the same driver and motor the current drawn from the power supply will be different (lower current) for a higher voltage power supply than for a lower voltage one. Indeed, I have seen drivers overheat simply because the power supply voltage was too low. This is a natural result of the driver delivering a mostly constant amount of power, but having to draw more current to do so. Heating in the driver is dominated by I squared R when the MOSFETs are fully turned on, and twice the current results in four times the heat losses. Things get complicated because the power required is the sum of: 1) mechanical power delivered by the motor 2) mechanical losses within the motor (bearing and air drag) 3) resistive losses ( I squared R ) 4) hystersis losses in the iron (this is often the main cause of motor heating) 5) efficiency of the driver itself Modeling all of the above is a lot of work, even if you do have accurate data to start from. Gecko has stated that the 67% is the most you are going to need assuming you have selected a reasonable power supply voltage and are driving the motor to deliver its maximum mechanical power output. The fact that most machines only move two axes at a time for most operations will mean that the mechanical part of the power is less, but the other factors are not much effected by the mechanical power output. I generally tell my customers that 50% is good enough for typical machines, 67% will provide for anything you can ever hope to achieve, and anything more is purely for bragging rights. Regards, Steve Stallings PMDX -Original Message- From: Dave Caroline [mailto:dave.thearchiv...@gmail.com] Sent: Wednesday, December 28, 2011 1:27 PM To: Enhanced Machine Controller (EMC) Subject: Re: [Emc-users] stepper power supply The reason they state 67% is because they are not getting the full torque from the motor They are not fully powering both windings and there is an assumption that the motors are not all in the same phase so some windings are partially powered. for full step and full power you power both windings fully. see half step and microstep sections http://en.wikipedia.org/wiki/Stepper_motor Dave Caroline -- Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex infrastructure or vast IT resources to deliver seamless, secure access to virtual desktops. With this all-in-one solution, easily deploy virtual desktops for less than the cost of PCs and save 60% on VDI infrastructure costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex infrastructure or vast IT resources to deliver seamless, secure access to virtual desktops. With this all-in-one solution, easily deploy virtual desktops for less than the cost of PCs and save 60% on VDI infrastructure costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] stepper power supply
On Wednesday, December 28, 2011 10:10:54 PM Steve Stallings did opine: Sorry, but a different opinion here Gecko publishes the 67% number based on real world experience with a large number of motors and power supplies tested. The reality of calculating the current needed is daunting. First you start by looking at power, which is what is really being delivered. The Gecko drivers are modern chopping drivers which behave somewhat like a switching power supply. They convert a high voltage moderate current into a lower voltage at a higher, but regulated, current to drive the motor. For the same driver and motor the current drawn from the power supply will be different (lower current) for a higher voltage power supply than for a lower voltage one. Indeed, I have seen drivers overheat simply because the power supply voltage was too low. This is a natural result of the driver delivering a mostly constant amount of power, but having to draw more current to do so. Heating in the driver is dominated by I squared R when the MOSFETs are fully turned on, and twice the current results in four times the heat losses. Another effect of a miss-match between power supply and driver is often overlooked, and that is the I*r loss in the mosfet as it is turning off this higher current during the 10-100 nanoseconds it takes to turn it off. Because more current was flowing, there are more charge carriers that must be cleared away and this loads the mosfets (hexfets) driver stage and slows in down. What this translates to in the real world is that a 48 volt driver, running on 24 volts will probably need to get rid of about 4.5 to 5 times as much heat as the *4 doesn't take this switching time difference into account. OTOH, I think we are getting closer all the time, thanks to the push for ever more efficient computer psu's, which has led to the development of ever faster switching transition times AND ever lower on resistances. I believe I benefited much from that effect when I blew the hexfet in my micromills motor controller. I looked up and printed out tha data sheet on that device, picked up a dead psu I'd had laying around for a couple years, checked the hexfets in it, and found that except for the gate capacitance going up by about 150%, every other specification was anywhere from 2 to 10x better. So I put it in, and watched it with an IR thermometer while the motor was being run at about 75% of full rpms for around an hour. I could not find a single part that was more than 15F above the background room temp and the hexfet itself was only warmed maybe 3F. So I put it back together and its still fairly well sealed inside a shack project box, about a 3.5x5.8x7 black plastic thing, sharing room with your PMDX-106. It does warm some but more than 15F of ambient. Running nicely for at least 2 years now. Things get complicated because the power required is the sum of: 1) mechanical power delivered by the motor 2) mechanical losses within the motor (bearing and air drag) 3) resistive losses ( I squared R ) 4) hystersis losses in the iron (this is often the main cause of motor heating) 5) efficiency of the driver itself Modeling all of the above is a lot of work, even if you do have accurate data to start from. Gecko has stated that the 67% is the most you are going to need assuming you have selected a reasonable power supply voltage and are driving the motor to deliver its maximum mechanical power output. The fact that most machines only move two axes at a time for most operations will mean that the mechanical part of the power is less, but the other factors are not much effected by the mechanical power output. I generally tell my customers that 50% is good enough for typical machines, 67% will provide for anything you can ever hope to achieve, and anything more is purely for bragging rights. Such a statement covers it quite well Steve. Regards, Steve Stallings PMDX 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) My web page: http://coyoteden.dyndns-free.com:85/gene People who take cat naps don't usually sleep in a cat's cradle. -- Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex infrastructure or vast IT resources to deliver seamless, secure access to virtual desktops. With this all-in-one solution, easily deploy virtual desktops for less than the cost of PCs and save 60% on VDI infrastructure costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
