[Emc-users] Step Direction
Help please I have successfully ungraded to EMC2 (Ubuntu) and things are running smoothly with my Stepper motors using the standard set up files. I had to add/adjusted the step length which now seems fine, but have changed little else. My only problem is, the axis are going the wrong ways! I've spent about a day playing with various settings -invert / not and have come to the conclusion, I haven't a clue which setup file I should be fiddling in. I've even resorted to reading the manual, but I'm still none the wiser. Can any tell me the best place add a change of direction command and what it should look like, please ? Thanks David - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Step Direction
Easiest way will be editing HAL file which describes the stepper output pins connection and you are done in 30 seconds ;-) On 12/28/06, David at home [EMAIL PROTECTED] wrote: Help please I have successfully ungraded to EMC2 (Ubuntu) and things are running smoothly with my Stepper motors using the standard set up files. I had to add/adjusted the step length which now seems fine, but have changed little else. My only problem is, the axis are going the wrong ways! I've spent about a day playing with various settings -invert / not and have come to the conclusion, I haven't a clue which setup file I should be fiddling in. I've even resorted to reading the manual, but I'm still none the wiser. Can any tell me the best place add a change of direction command and what it should look like, please ? Thanks David - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Step Direction
the easiest way that I know of is to simply change the sign in front or your input scale value for the offending axis. This is in your ini file. INPUT_SCALE = 81920 0 INPUT_SCALE = -81920 0 sam - Original Message - From: Mario. [EMAIL PROTECTED] To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net Sent: Thursday, December 28, 2006 9:07 AM Subject: Re: [Emc-users] Step Direction Easiest way will be editing HAL file which describes the stepper output pins connection and you are done in 30 seconds ;-) On 12/28/06, David at home [EMAIL PROTECTED] wrote: Help please I have successfully ungraded to EMC2 (Ubuntu) and things are running smoothly with my Stepper motors using the standard set up files. I had to add/adjusted the step length which now seems fine, but have changed little else. My only problem is, the axis are going the wrong ways! I've spent about a day playing with various settings -invert / not and have come to the conclusion, I haven't a clue which setup file I should be fiddling in. I've even resorted to reading the manual, but I'm still none the wiser. Can any tell me the best place add a change of direction command and what it should look like, please ? Thanks David - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Step Direction
On Thu, Dec 28, 2006 at 03:08:26PM +, David at home wrote: Can any tell me the best place add a change of direction command and what it should look like, please ? Just make the INPUT_SCALE negative in the .ini. Chris - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Lowest speed with servo system ?
Hi all, With a servo system using quadrature encoder feedback, what is the slowest speed that can reliably be used ? I would imagine that there is a problem if there are no counts between successive calls to the PID loop ? resulting in jerky instead of smooth slow motion ? any way to improve on this using some smart HAL code ? The setup I'm planning would use a 1000 line encoder (4000counts/rev) motor directly coupled to a 2.5mm/rev ballscrew. If I require one count for each call to the PID loop (1 kHz count rate) then that works out to 0.25rev/s or 15 rpm or a feedrate of 37.5mm/min which does not seem that low ?? comments appreciated ! Anders - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Lowest speed with servo system ?
Mario. wrote: If power rating for the slow motion would be ~10W or so, a big, fast microstepper stepper motor, like the Shinano Kenshi SKC83D I use could do the job. With 250 microsteps per electrical phase I get 12500 microsteps per revolution, what can get you really fluent motion. But that is the system of things I like to use, your conditions may vary. Of course conditions will vary. The machine in question is a big servo-controlled milling machine, and axis speeds of several hundred IPM are planned. The OP was asking what the minimum speeds might be without motion breaking down into discrete steps. If ONLY such low speeds were being planned, a huge servo would not make sense. Jon - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Mesa m5i20 PWM frequency ?
Jon tells me his amplifiers are optimized for 50 kHz PWM frequency. Does anyone know in what range the PWM frequency is adjustable on the Mesa M5i20 ? Its limited to ~33 KHz at the moment (33.3 MHz PCI clock /1024) It would be pretty easy to use the 50 MHz clock instead to the max would be close to 50 KHz, or double that for 100 KHz or so maximum. 50 KHz is pretty high for PWM, as the switching losses in the HBridge go up, and the dead time becomes more of the total cycle time. If the PWM is not used directly to drive a HBridge, (just filtered to generate an analog current threshold or something) then using the interleaved PWM option will result lower ripple, so such a high PWM rate is not needed, but dont use the interleaved option if the PWM drives an HBridge directly... The manual talks about 10-bit PWM with a 33MHz clock so 1024 ticks equals 31us or 32.2 kHz is it possible to use a higher PWM frequency than this ? AW OK I've made 4 new FPGA configurations: 1. HM5-4E - 4 axis 33 MHz PWM clock Same as before, just added R/O ID/REV/AXIS register and MCLK freq register ID/REV reads AA010004 (low half is # of axis), MCLK reads 33. MHz 2. HM5-8E - 8 axis 33 MHz PWM clock Same as before, just added R/O ID/REV/AXIS register and MCLK freq register ID/REV reads AA010008 (low half is # of axis), MCLK reads 33. MHz 3. HM5-4EH - 4 axis 100 MHz PWM clock Modified so basic clock for PWM and interrupt rate is 100 MHz ID/REV reads AA020004 (low half is # of axis), MCLK reads 100 MHz 4. HM5-8EH - 8 axis 100 MHz PWM clock Modified so basic clock for PWM and interrupt rate is 100 MHz ID/REV reads AA020008 (low half is # of axis), MCLK reads 100 MHz FPGA configurations 3 and 4 allow PWM rates up to 97.6 KHz (100 MHz/1024) Anders had asked for 66MHz master clock which I can do easily, (by doubling the PCI clock) but I figured that using the on card 50 MHz oscillator (which is used to generate the 100 MHz) has the advantage of known frequency, where the PCI bus clock could be anywhere from 32 to 33. MHz. Also, having PWM rates up to 97.6 KHz allows some headroom if someone wants to play with optimum PWM rate for a given HBridge. If 66 MHz PWM clock is really desired, I could probably use two DCMs and quadruple the 50 MHz to 200 MHz then divide that by 3 for a known 66.6 MHz, but cascading DCMs is a nuisance in Spartan2. I can send the source and bit files tommorow. (where?) Peter Wallace - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Step Direction
David, Try reversing the sign of the INPUT_SCALE parameter in the AXIS_# section of your .ini file. I used this to reverse the direction of my steppers i.e. INPUT_SCALE = 12000 0 turns clockwise INPUT_SCALE = -12000 0 should turn anti-clockwise Hope this helps. Andy -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of David at home Sent: 28 December 2006 15:08 To: emc-users@lists.sourceforge.net Subject: [Emc-users] Step Direction Help please I have successfully ungraded to EMC2 (Ubuntu) and things are running smoothly with my Stepper motors using the standard set up files. I had to add/adjusted the step length which now seems fine, but have changed little else. My only problem is, the axis are going the wrong ways! I've spent about a day playing with various settings -invert / not and have come to the conclusion, I haven't a clue which setup file I should be fiddling in. I've even resorted to reading the manual, but I'm still none the wiser. Can any tell me the best place add a change of direction command and what it should look like, please ? Thanks David - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDE V ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
