[Emc-users] steppers with linear mag scales

there's a user in Japan, Mr AkiraHitosi who has some nice videos using CamPy and CamView but I noticed he was using steppers with linear scales ( magnetic) https://www.youtube.com/watch?v=G6ZcdvOgX1s afaict... google xl8 says " A USB camera is attached to the NC router frame using

Re: [Emc-users] steppers with encoders in closed loop

- Original Message - > From: "Valerio Bellizzomi" <vale...@selnet.org> > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > Sent: Tuesday, June 27, 2017 3:58:34 AM > Subject: Re: [Emc-users] steppers with encoders in

Re: [Emc-users] steppers with encoders in closed loop

t; loops. > > > > - Original Message - > > From: "Tom Easterday" <tom-...@bgp.nu> > > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > > Sent: Monday, June 26, 2017 8:37:47 AM > > Subject: Re: [Emc-users] stepp

Re: [Emc-users] steppers with encoders in closed loop

Latest plot (on X axis): http://bgp.nu/~tom/pub/pid-X-ff2.png -- Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot

Re: [Emc-users] steppers with encoders in closed loop

Thanks Peter, It did help a small bit. Max f-error is now .00014 to .00015 (vs .00018 to .00019). That is a sensitive parameter. I played with FF2 = .001 (bad), .0006 (bad), .00055 ok but ferror was .00016-.00017, so I left it at .0005. -Tom > On Jun 26, 2017, at 7:35 PM, Peter C. Wallace

Re: [Emc-users] steppers with encoders in closed loop

On Mon, 26 Jun 2017, tom-...@bgp.nu wrote: Date: Mon, 26 Jun 2017 19:20:14 -0400 From: tom-...@bgp.nu Reply-To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> S

Re: [Emc-users] steppers with encoders in closed loop

And for those following along at home, I got the machine set up in velocity mode and the pid tuned fairly well. The following error is less than .0002 and the machine runs very nicely, and I can now Home to the index pulse on the encoder (which is where this all began)! Yay. Below are links

Re: [Emc-users] steppers with encoders in closed loop

"Tom Easterday" <tom-...@bgp.nu> > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > Sent: Monday, June 26, 2017 8:37:47 AM > Subject: Re: [Emc-users] steppers with encoders in closed loop > > Exactly, and any help in

Re: [Emc-users] steppers with encoders in closed loop

he encoder feedback. Then connect the encoders to the PID loops. - Original Message - From: "Tom Easterday" <tom-...@bgp.nu> To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> Sent: Monday, June 26, 2017 8:37:47 AM Subject: Re: [Emc-us

Re: [Emc-users] steppers with encoders in closed loop

Exactly, and any help in getting my stall detection and position tracking working using velocity mode would be greatly appreciated  -Tom > On Jun 26, 2017, at 6:52 AM, Rene Hopf wrote: > > there is no benefit in using them in linuxcnc, apart from stall detection or >

Re: [Emc-users] steppers with encoders in closed loop

> On 26. Jun 2017, at 00:12, tom-...@bgp.nu wrote: > > I would like to attempt to get my machine with stepper motors running in > velocity mode with feedback from the encoders. this setup makes absolutely no sense. if the drive does not use the encoder, there is no benefit in using them in

Re: [Emc-users] steppers with encoders in closed loop

On Sunday 25 June 2017 22:13:04 Tom Easterday wrote: > Gene, > Thanks for the response. The machine has been running great for years > on those values but in position mode, not in velocity mode. I > wouldn't think that any of the step-gen parameters would need to > change when changing to

Re: [Emc-users] steppers with encoders in closed loop

Gene, Thanks for the response. The machine has been running great for years on those values but in position mode, not in velocity mode. I wouldn't think that any of the step-gen parameters would need to change when changing to velocity mode...? I suspect the PID parameters I am using,

Re: [Emc-users] steppers with encoders in closed loop

On Sunday 25 June 2017 18:12:14 tom-...@bgp.nu wrote: > I would like to attempt to get my machine with stepper motors running > in velocity mode with feedback from the encoders. Below are the > relevant parts of my Hal and Ini files for just the X-Axis. I figured > I would do one axis at a

[Emc-users] steppers with encoders in closed loop

I would like to attempt to get my machine with stepper motors running in velocity mode with feedback from the encoders. Below are the relevant parts of my Hal and Ini files for just the X-Axis. I figured I would do one axis at a time. Currently nothing happens when I try to jog the X axis

[Emc-users] Steppers losing position

Hello! I have a strange situation: Stepper motor of Z axis on a cnc router is losing it's position - doing a series of numerous holes in material will end up with various depths of holes. The strange part is: 1) for each time, when machine is running, it will lose position only in one direction;

Re: [Emc-users] Steppers losing position

If the holes are deeper doesn't it means that the motor is making more steps and not less ? Is it possible that you have extra steps due to noises or bad connections PC --- BoB --- Gecko Drive ? Alex On Thu, Sep 4, 2014 at 5:07 PM, Viesturs Lācis viesturs.la...@gmail.com wrote: Hello! I

Re: [Emc-users] Steppers losing position

On Thursday 04 September 2014 11:07:07 Viesturs Lācis did opine And Gene did reply: Hello! I have a strange situation: Stepper motor of Z axis on a cnc router is losing it's position - doing a series of numerous holes in material will end up with various depths of holes. The strange part

Re: [Emc-users] Steppers losing position

2014-09-04 18:16 GMT+03:00 alex chiosso achio...@gmail.com: If the holes are deeper doesn't it means that the motor is making more steps and not less ? Is it possible that you have extra steps due to noises or bad connections PC --- BoB --- Gecko Drive ? Yes, as I said, motor is drifting in

Re: [Emc-users] Steppers losing position

As Gene is suggesting , here http://linuxcnc.org/index.php/english/forum/16-stepconf-wizard/27293-solved-tuning-stepper-motor-with-gecko-201-driver?start=10 is a discussion on the forum regarding problems with steps and Gecko Drive . A question for you ... the router is brand new (I mean that you

Re: [Emc-users] Steppers losing position

As you sad : Yes, as I said, motor is drifting in particular direction, which may change (not always), if system is restarted, but the direction of drift does not change, once the system is running - if it gradually goes up, then it does so; if down, then it keeps getting deeper. Means that the

Re: [Emc-users] Steppers losing position

2014-09-04 18:29 GMT+03:00 alex chiosso achio...@gmail.com: A question for you ... the router is brand new (I mean that you have finished the setup) or is a already working machine ? I built that machine 3 years ago. Viesturs

Re: [Emc-users] Steppers losing position

2014-09-04 18:32 GMT+03:00 alex chiosso achio...@gmail.com: Means that the drift in is both directions. But the axis (motor) is always making more space than expected , isn't it ? Yes, drift can be in any direction, but the change of direction happens only on system restart. Viesturs

Re: [Emc-users] Steppers losing position

This seems to be an electrical problem . Have you tried to perform the machine cycle (i.e the holes drilling) in dry mode (no material) and with a reduced feed rate ? Just to understand if is related to the step frequency and torque . Alex On Thu, Sep 4, 2014 at 5:37 PM, Viesturs Lācis

Re: [Emc-users] Steppers losing position

On 4 September 2014 16:07, Viesturs Lācis viesturs.la...@gmail.com wrote: There is Nema23 stepper motor and Gecko stepper driver. A vaguely recall hearing of one channel of the G540 going bad and then also that inverting the step signals makes it good again. It certainly seems that it might be

Re: [Emc-users] Steppers losing position

Greetings -Original Message- From: Viesturs Lācis [mailto:viesturs.la...@gmail.com] 2014-09-04 18:16 GMT+03:00 alex chiosso achio...@gmail.com: If the holes are deeper doesn't it means that the motor is making more steps and not less ? Is it possible that you have extra steps due to

Re: [Emc-users] Steppers losing position

On 9/4/2014 9:07 AM, Viesturs Lācis wrote: Hello! I have a strange situation: Stepper motor of Z axis on a cnc router is losing it's position - doing a series of numerous holes in material will end up with various depths of holes. The strange part is: 1) for each time, when machine is

Re: [Emc-users] Steppers losing position

On 9/4/2014 9:07 AM, Viesturs Lācis wrote: Hello! I have a strange situation: Stepper motor of Z axis on a cnc router is losing it's position - doing a series of numerous holes in material will end up with various depths of holes. Just thought of this, have you tried homing the Z axis up

Re: [Emc-users] steppers

Could you give me some idea of what the advantage is of using 2 and 3 stack steppers? Perhaps I'm in over my head here, but I'll share what I think I know. The tendency for 2 to 3 stack steppers is for the magnetic circuit inside to get too long, and create high inductance for the

Re: [Emc-users] steppers

On Wednesday, January 18, 2012 12:16:45 AM cogoman did opine: Could you give me some idea of what the advantage is of using 2 and 3 stack steppers? Perhaps I'm in over my head here, but I'll share what I think I know. The tendency for 2 to 3 stack steppers is for the magnetic

Re: [Emc-users] steppers

Hi Gene: Could you give me some idea of what the advantage is of using 2 and 3 stack steppers? You seem to know a lot and I hope you don't mind me asking dumb questions. Thanks Bill -- RSA(R) Conference 2012 Mar

Re: [Emc-users] steppers

On Monday, January 16, 2012 04:07:22 PM Cathrine Hribar did opine: Hi Gene: Could you give me some idea of what the advantage is of using 2 and 3 stack steppers? You seem to know a lot and I hope you don't mind me asking dumb questions. Thanks Bill As I see it, its a tradeoff, you

Re: [Emc-users] steppers

On Mon, 16 Jan 2012 16:28:58 -0500 gene heskett ghesk...@wdtv.com wrote: On Monday, January 16, 2012 04:07:22 PM Cathrine Hribar did opine: Hi Gene: Could you give me some idea of what the advantage is of using 2 and 3 stack steppers? You seem to know a lot and I hope you don't mind

Re: [Emc-users] steppers

On 16 January 2012 22:06, Cathrine Hribar bhri...@bresnan.net wrote: are u saying that the nema 34 would be equal to a nema 23 three stack? Three-stack steppers in 23 size seem to be quite slow. I haven't ever tried a 34, but I understand that they have the same problem. I think you need to

Re: [Emc-users] steppers

On Monday, January 16, 2012 05:19:37 PM Cathrine Hribar did opine: On Mon, 16 Jan 2012 16:28:58 -0500 gene heskett ghesk...@wdtv.com wrote: On Monday, January 16, 2012 04:07:22 PM Cathrine Hribar did opine: Hi Gene: Could you give me some idea of what the advantage is of using 2

Re: [Emc-users] steppers

Hi Gene: Tnx for the info on ur steppers. I have 8 wire steppers and have wired them series. From what you said about your steppers, and controller, you wired in parallel, true? My controller is, like yours, 2.8 amp limit. As I think about it, if the steppers are wired in series, like I

Re: [Emc-users] steppers

On 13 January 2012 17:09, Cathrine Hribar bhri...@bresnan.net wrote: My controller is, like yours, 2.8 amp limit. As I think about it, if the steppers are wired in series, like I wired mine, they would require twice as much current to give the most torque, right?. No. In series you get twice

Re: [Emc-users] steppers

On Friday, January 13, 2012 03:00:21 PM Cathrine Hribar did opine: Hi Gene: Tnx for the info on ur steppers. I have 8 wire steppers and have wired them series. From what you said about your steppers, and controller, you wired in parallel, true? My controller is, like yours, 2.8 amp

Re: [Emc-users] steppers

On Fri, 2012-01-13 at 10:09 -0700, Cathrine Hribar wrote: if the steppers are wired in series, like I wired mine, they would require twice as much current Having waded through this mess not too long ago, here's what I (think I) know... Putting the two halves of a single pole's winding in

Re: [Emc-users] steppers

On Fri, 13 Jan 2012 17:48:42 + andy pugh bodge...@gmail.com wrote: On 13 January 2012 17:09, Cathrine Hribar bhri...@bresnan.net wrote: My controller is, like yours, 2.8 amp limit. As I think about it, if the steppers are wired in series, like I wired mine, they would require twice

Re: [Emc-users] steppers

On Fri, 13 Jan 2012 16:59:48 -0500 Ed Nisley ed.08.nis...@pobox.com wrote: On Fri, 2012-01-13 at 10:09 -0700, Cathrine Hribar wrote: if the steppers are wired in series, like I wired mine, they would require twice as much current Having waded through this mess not too long ago, here's

Re: [Emc-users] steppers

On Fri, 13 Jan 2012 15:22:26 -0500 gene heskett ghesk...@wdtv.com wrote: On Friday, January 13, 2012 03:00:21 PM Cathrine Hribar did opine: Hi Gene: Tnx for the info on ur steppers. I have 8 wire steppers and have wired them series. From what you said about your steppers, and

Re: [Emc-users] steppers

On Friday, January 13, 2012 07:42:17 PM Cathrine Hribar did opine: On Fri, 13 Jan 2012 15:22:26 -0500 gene heskett ghesk...@wdtv.com wrote: On Friday, January 13, 2012 03:00:21 PM Cathrine Hribar did opine: Hi Gene: Tnx for the info on ur steppers. I have 8 wire steppers and

Re: [Emc-users] steppers/encoders

Hi all: Is it possible for EMC2 to be setup to use info from encoders to stop movement of a cnc machine when the EMC2 system is driving steppers? I have read the wiki; Steppers with encoders - jlmjvm's story, the author said he is able to do just that! I noted that he said he would post his

Re: [Emc-users] Steppers as encoders (was Re: Do I understand the EMC/HAL/UI architecture properly)

On Monday, August 30, 2010 09:50:36 am Kent A. Reed did opine: On 8/30/2010, Gene wrote Guys, would you recommend some inexpensive encoder type hand controls? I would like to control speed override with a rugged encoder type rotary control. A thought that I have played with

Re: [Emc-users] Steppers

Hi, I fixed the problem - I hadn't realised that the L297/L298 board had a current adjustment on it - don! It must have been just below a critical value as this morning neither motor would run on that driver and it only took a little tweak to get it to drive the motors at full power. It

Re: [Emc-users] Steppers

On Fri, 2009-10-16 at 16:03 +0100, Ian W. Wright wrote: Hi, I fixed the problem - I hadn't realised that the L297/L298 board had a current adjustment on it - don! It must have been just below a critical value as this morning neither motor would run on that driver and it only took a

[Emc-users] Steppers

Hi, I am totally perplexed! I have two apparently very similar stepper motors - i.e. made by the same company ( Oriental Stepper), both 32 size and single stack although one is about 1/4in longer than the other. Lets call them X and Y to avoid confusion. I also have two driver boards - not

Re: [Emc-users] Steppers

On Thu, Oct 15, 2009 at 10:02 PM, Ian W. Wright watchma...@talktalk.net wrote: Hi, I am totally perplexed! I have two apparently very similar stepper motors - i.e. made by the same company ( Oriental Stepper), both 32 size and single stack although one is about 1/4in longer than the other.

Re: [Emc-users] Steppers

carefully. Measure coil resistance from the driver side of the driver to motor connector. Regards John Harris Ex-Brit - Original Message - From: Ian W. Wright watchma...@talktalk.net To: emc-users@lists.sourceforge.net Sent: Thursday, October 15, 2009 3:02 PM Subject: [Emc-users

Re: [Emc-users] Steppers with Encoders

Stuart Stevenson wrote: Gentlemen, I have seen (youtube) the conversion of an automotive alternator to a stepper motor. The fields are pulsed and no motion occurs until the rotor has dc voltage applied. Would it be possible to use this type of stepper to overcome some of the speed and

Re: [Emc-users] Steppers with Encoders

Gentlemen, My suggestion was to use a stepper of a type built like an alternator. If that concept would be useful. Just throwing out ideas. It may not be feasible but who knows? Definitely not me. :) thanks Stuart On Tue, Jan 6, 2009 at 11:23 AM, Jon Elson el...@pico-systems.com wrote: Stuart

Re: [Emc-users] Steppers with Encoders

Stuart Stevenson wrote: Gentlemen, My suggestion was to use a stepper of a type built like an alternator. If that concept would be useful. Just throwing out ideas. It may not be feasible but who knows? Definitely not me. :) Even an 8-pole alternator would only have 32 full steps/rev.

Re: [Emc-users] Steppers with Encoders

The biggest problem with stepper motors is they are designed to have a given DC resistance so that some DC voltage can be applied without the current going it infinity when the motor is stopped. That resistance is why they get hot. Unlike that stepper motor every good high performance AC or

Re: [Emc-users] Steppers with Encoders

On Tue, 6 Jan 2009, Jon Elson wrote: Date: Tue, 06 Jan 2009 21:30:20 -0600 From: Jon Elson el...@pico-systems.com Reply-To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net Subject: Re: [Emc-users

[Emc-users] Steppers with Encoders

and a voice spoke out from the one lurking in the shadows. I may be just blowing smoke here - but there might be a functional compromise. I honestly have not been under the hood of EMC (interp or trajectory planner) so I don't know if what I'm proposing is even possible with the existing code

Re: [Emc-users] Steppers with Encoders

Gentlemen, I have seen (youtube) the conversion of an automotive alternator to a stepper motor. The fields are pulsed and no motion occurs until the rotor has dc voltage applied. Would it be possible to use this type of stepper to overcome some of the speed and torque limitations of a PM

Re: [Emc-users] Steppers with Encoders

Greg Bentzinger wrote: [snip] I am not proposing using an encoder for coordinated movement feedback like a servo would require, that would still be handled by counting the stepgen output. What I propose would be having an aux input for the encoders and a separate DRO display on the GUI like

Re: [Emc-users] Steppers with Encoders

On Jan 5, 2009, at 7:12 PM, Stephen Wille Padnos wrote: Greg Bentzinger wrote: [snip] I am not proposing using an encoder for coordinated movement feedback like a servo would require, that would still be handled by counting the stepgen output. What I propose would be having an aux input

Re: [Emc-users] Steppers with Encoders

Dave Engvall wrote: [snip] If my memory serves me correctly then there might be an intermediate position. I think code exist by JMK to use an rotary encoder plus a linear scale. Yes, we did this on Stuart's GL servo machine. Could this be extended to separate the I from PD in steppers and

Re: [Emc-users] Steppers with Encoders

(EMC) Subject: Re: [Emc-users] Steppers with Encoders Gentlemen, I have seen (youtube) the conversion of an automotive alternator to a stepper motor. The fields are pulsed and no motion occurs until the rotor has dc voltage applied. Would it be possible to use this type of stepper

Re: [Emc-users] Steppers with Encoders

On Jan 5, 2009, at 7:51 PM, Stephen Wille Padnos wrote: Dave Engvall wrote: [snip] If my memory serves me correctly then there might be an intermediate position. I think code exist by JMK to use an rotary encoder plus a linear scale. Yes, we did this on Stuart's GL servo machine.

Re: [Emc-users] Steppers vs Servo based CNC kit for Sherline

Sounds like you are getting some good training to use the e-stop for emergencies and not as a stop button... John On 29 Jul 2008 at 0:13, Kirk Wallace wrote: On Mon, 2008-07-28 at 23:10 -0500, Jon Elson wrote: ... snip Another thing is that axis alignment is preserved when you hit

Re: [Emc-users] Steppers vs Servo based CNC kit for Sherline

On Mon, 2008-07-28 at 14:52 -0400, Sergey Izvoztchikov wrote: Thanks for all replays. I definitely didn't mean to sparkle any flame wars, sorry. It's reckless noob question, I probably shouldn't have asked. If others still want to voice their opinions, go ahead, but I absolutely not want any

Re: [Emc-users] Steppers vs Servo based CNC kit for Sherline

On Tue, 2008-07-29 at 21:03 -0400, Sergey Izvoztchikov wrote: ... snip After all, CNC supposed to be the way to produce parts for my projects, not another project by itself. I did let that point get away. Beside this all there are other learning curves in front of me - CNC programming, CAM

Re: [Emc-users] Steppers vs Servo based CNC kit for Sherline Mill ?

Hi Sergey, IM Service do some nice servos that are ideally suited to a Sherline http://www.cadcamcadcam.com/index.asp?PageAction=VIEWCATSCategory=11 They also do some nice servo drivers though they are step/direction so you can't use the encoders as a DRO. Steppers do work and can be

Re: [Emc-users] Steppers vs Servo based CNC kit for Sherline Mill ?

Sergey Izvoztchikov wrote: I'm faced with dilemma, which has no obvious answer for me at the moment. I was set to buy Xylotex steppers based kit for my CNC Sherline Mill. After reading more about servo based systems I'm divided, I could appreciate number of advantages of servo based systems

Re: [Emc-users] Steppers vs Servo based CNC kit for Sherline

I am a servo bigot, and just don't want to do anything like machining metal while flying blind, which is how I think of stepper systems. Jon I cant let this pass without a comment. As someone said earlier this is 'holy war #1' in the CNC hobby. It is a fact, not disputable, that

Re: [Emc-users] Steppers vs Servo based CNC kit for Sherline Mill ?

At 11:21 AM 7/28/2008, you wrote: I am a servo bigot, and just don't want to do anything like machining metal while flying blind, which is how I think of stepper systems. Jon Personally I would go one step farther. I want torque or velocity mode system and not a position mode (step/dir) motion

Re: [Emc-users] Steppers vs Servo based CNC kit for Sherline

M2CW Nothing wrong with your question. No foul in the replies. We need a little heat once in a while. It tends to clarify things and you asked for clarification. Many other in the list are looking for the same info. We are really fortunate that we have as many choices as we do. Rayh On

Re: [Emc-users] Steppers vs Servo based CNC kit for Sherline

Ron Ginger wrote: I am a servo bigot, and just don't want to do anything like machining metal while flying blind, which is how I think of stepper systems. Jon I cant let this pass without a comment. As someone said earlier this is 'holy war #1' in the CNC hobby. It is a fact, not

[Emc-users] Steppers and INI file

I am running a four-axis mini-type mill with a xylotec board and stepper motors throughout. Everything runs fine (pretty much) except for the 4th axis which is an angular axis. All the linear axes have the same settings in the INI file and are mechanically the same. I have noticed that when

Re: [Emc-users] Steppers and INI file

On Thu, Mar 01, 2007 at 04:04:16PM -0800, Glenn R. Edwards wrote: I have noticed that when I do a fast-move command with all axes going, such as G0 X50 Y30 Z20 A90 (from home), the angular axis will move faster than when I do a single axis move such as G0 A90. Please post your ini (attach

Re: [Emc-users] Steppers and INI file

Thanks Chris. The G0 answer makes sense. I am running EMC 2.1.1 I'll post the INI file as soon as I get it off the machine. Best regards, -- -- Glenn On Thu, Mar 01, 2007 at 04:04:16PM -0800, Glenn R. Edwards wrote: I have noticed that when I do a fast-move command with all axes going,