Re: [Emc-users] Encoder reset on homing to index
The rotary encoder is supplying it's own power (+5v) as it's the encoder
relay/output from an amplifier and not directly from the rotary encoder.
The linear encoder is using the inbuilt 7i77 5v. Common ground, at least I
assume all the encoder inputs have a common ground... So I guess jumpering
the index over shouldn't be a big deal.
Feels a bit unsatisfying though. I understand the timing issues (though
I'm not sure with a slow homing cycle I should care) but not solving this
in a reasonably elegant way in software seems like a fail to me. Maybe
that's just the Covid Crankiness talking.
-Dave
On Fri, 24 Apr 2020 19:23:18 -0400, Peter C. Wallace
wrote:
On Fri, 24 Apr 2020, David Berndt wrote:
Date: Fri, 24 Apr 2020 19:02:54 -0400
From: David Berndt
To: "Enhanced Machine Controller (EMC)"
,
Peter C. Wallace
Subject: Re: [Emc-users] Encoder reset on homing to index
If I understand you correctly that would be the goal. But how do I tie
them together?
As I understand it now I'll need to detect when index-enable changes
state to false, as an indication of the preferred index signal being
detected. Then fire a oneshot to encoder.LinearNumber.reset
I was suggesting that you wire the preferred physical index signal
to both encoder inputs, Then connect motions index-enable pin to both
encoder index enables in hal, no one-shots or resets involved.
In general you would not want to do a physical encoder counter reset
in hal (at least when in motion) because:
1. Its not synchronized with the actual index signal so it will cause a
somewhat random count error proportional to velocity (random because
the time of index occurance is random compared to the counter reset at
the servo-thread write time)
2. Resetting the counter will corrupt the velocity calculation
-Dave
On Fri, 24 Apr 2020 18:20:07 -0400, Peter C. Wallace
wrote:
On Fri, 24 Apr 2020, David Berndt wrote:
Date: Fri, 24 Apr 2020 17:19:10 -0400
From: David Berndt
Reply-To: "Enhanced Machine Controller (EMC)"
To: emc-users@lists.sourceforge.net
Subject: [Emc-users] Encoder reset on homing to index
Can anyone enlighten me as to how hm2_5i25.0.encoder.N.position seems
to get reset during homing to index? I assume somethnig is triggering
hm2_5i25.0.encoder.N.reset? But I don't see that plumbed up anywhere
in my HAL.
I'm adding a linear encoder to a servo axis and am retaining my
servo homing, but when it homes I need to zero the linear encoder as
well if the rotary is going to zero to avoid huge f-errors and other
issues...
Thanks,
-Dave
Why dont you use the preferred index signal to zero both encoders?
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Re: [Emc-users] Encoder reset on homing to index
On Fri, 24 Apr 2020, David Berndt wrote:
Date: Fri, 24 Apr 2020 19:02:54 -0400
From: David Berndt
To: "Enhanced Machine Controller (EMC)" ,
Peter C. Wallace
Subject: Re: [Emc-users] Encoder reset on homing to index
If I understand you correctly that would be the goal. But how do I tie them
together?
As I understand it now I'll need to detect when index-enable changes state to
false, as an indication of the preferred index signal being detected. Then
fire a oneshot to encoder.LinearNumber.reset
I was suggesting that you wire the preferred physical index signal
to both encoder inputs, Then connect motions index-enable pin to both
encoder index enables in hal, no one-shots or resets involved.
In general you would not want to do a physical encoder counter reset
in hal (at least when in motion) because:
1. Its not synchronized with the actual index signal so it will cause a
somewhat random count error proportional to velocity (random because
the time of index occurance is random compared to the counter reset at the
servo-thread write time)
2. Resetting the counter will corrupt the velocity calculation
-Dave
On Fri, 24 Apr 2020 18:20:07 -0400, Peter C. Wallace wrote:
On Fri, 24 Apr 2020, David Berndt wrote:
Date: Fri, 24 Apr 2020 17:19:10 -0400
From: David Berndt
Reply-To: "Enhanced Machine Controller (EMC)"
To: emc-users@lists.sourceforge.net
Subject: [Emc-users] Encoder reset on homing to index
Can anyone enlighten me as to how hm2_5i25.0.encoder.N.position seems to
get reset during homing to index? I assume somethnig is triggering
hm2_5i25.0.encoder.N.reset? But I don't see that plumbed up anywhere in my
HAL.
I'm adding a linear encoder to a servo axis and am retaining my servo
homing, but when it homes I need to zero the linear encoder as well if the
rotary is going to zero to avoid huge f-errors and other issues...
Thanks,
-Dave
Why dont you use the preferred index signal to zero both encoders?
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users
Peter Wallace
Mesa Electronics
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users
Peter Wallace
Mesa Electronics
(\__/)
(='.'=) This is Bunny. Copy and paste bunny into your
(")_(") signature to help him gain world domination.
___
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Re: [Emc-users] Encoder reset on homing to index
If I understand you correctly that would be the goal. But how do I tie them together? As I understand it now I'll need to detect when index-enable changes state to false, as an indication of the preferred index signal being detected. Then fire a oneshot to encoder.LinearNumber.reset -Dave On Fri, 24 Apr 2020 18:20:07 -0400, Peter C. Wallace wrote: On Fri, 24 Apr 2020, David Berndt wrote: Date: Fri, 24 Apr 2020 17:19:10 -0400 From: David Berndt Reply-To: "Enhanced Machine Controller (EMC)" To: emc-users@lists.sourceforge.net Subject: [Emc-users] Encoder reset on homing to index Can anyone enlighten me as to how hm2_5i25.0.encoder.N.position seems to get reset during homing to index? I assume somethnig is triggering hm2_5i25.0.encoder.N.reset? But I don't see that plumbed up anywhere in my HAL. I'm adding a linear encoder to a servo axis and am retaining my servo homing, but when it homes I need to zero the linear encoder as well if the rotary is going to zero to avoid huge f-errors and other issues... Thanks, -Dave Why dont you use the preferred index signal to zero both encoders? ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users Peter Wallace Mesa Electronics ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Encoder reset on homing to index
Just a plain KA300 chinese linear encoder. On Fri, 24 Apr 2020 17:39:51 -0400, Leonardo Marsaglia wrote: Just because I'm curious, Is this an absolute linear encoder or an incremental one (or may be it can work in both ways)? El vie., 24 abr. 2020 a las 18:28, andy pugh () escribió: On Fri, 24 Apr 2020 at 22:21, David Berndt wrote: > > Can anyone enlighten me as to how hm2_5i25.0.encoder.N.position seems to > get reset during homing to index? I assume somethnig is triggering > hm2_5i25.0.encoder.N.reset? The encoder counts reset when encoder.N.index-enable is true and an index is seen. You can detect this as the index-enable goes false a the same time. -- atp "A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils and lunatics." — George Fitch, Atlanta Constitution Newspaper, 1912 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Encoder reset on homing to index
On Fri, 24 Apr 2020, David Berndt wrote: Date: Fri, 24 Apr 2020 17:19:10 -0400 From: David Berndt Reply-To: "Enhanced Machine Controller (EMC)" To: emc-users@lists.sourceforge.net Subject: [Emc-users] Encoder reset on homing to index Can anyone enlighten me as to how hm2_5i25.0.encoder.N.position seems to get reset during homing to index? I assume somethnig is triggering hm2_5i25.0.encoder.N.reset? But I don't see that plumbed up anywhere in my HAL. I'm adding a linear encoder to a servo axis and am retaining my servo homing, but when it homes I need to zero the linear encoder as well if the rotary is going to zero to avoid huge f-errors and other issues... Thanks, -Dave Why dont you use the preferred index signal to zero both encoders? ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users Peter Wallace Mesa Electronics ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Encoder reset on homing to index
> > Index-enable enable is true when index-enable is false? Who designed this? > Politicians? The index-enable pin is IO so It's set to TRUE when the homing sequence requires it. You can also set it to TRUE via HAL (I'm doing the latter with my homing sequence because I'm using servos in step+dir mode without encoder feedback) Once is true, it stays in that value until the encoder triggers the physical index pulse. I'm passing it through an edge component because I'm using the index as a "second" home switch once the latch state of the homing sequence starts. El vie., 24 abr. 2020 a las 18:43, David Berndt () escribió: > Index-enable enable is true when index-enable is false? Who designed > this? > Politicians? > > I don't even know what to say as I try to wrap my mind around this one... > Isn't there some sane/simple way to just tie the index-enable out bit > from > the one encoder to the index-enable in bit on the second encoder? > > If I have to setup a whole bunch of oneshot shenanigans for this I'm > going > to be very disappointed. > > -Dave > > On Fri, 24 Apr 2020 17:25:00 -0400, andy pugh wrote: > > > On Fri, 24 Apr 2020 at 22:21, David Berndt wrote: > >> > >> Can anyone enlighten me as to how hm2_5i25.0.encoder.N.position seems to > >> get reset during homing to index? I assume somethnig is triggering > >> hm2_5i25.0.encoder.N.reset? > > > > The encoder counts reset when encoder.N.index-enable is true and an > > index is seen. > > You can detect this as the index-enable goes false a the same time. > > > ___ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Encoder reset on homing to index
Am Fr., 24. Apr. 2020 um 23:43 Uhr schrieb David Berndt : > Index-enable enable is true when index-enable is false? Who designed > this? > Politicians? > > I don't even know what to say as I try to wrap my mind around this one... > Isn't there some sane/simple way to just tie the index-enable out bit > from > the one encoder to the index-enable in bit on the second encoder? > > If I have to setup a whole bunch of oneshot shenanigans for this I'm > going > to be very disappointed. > the index is captured in hardware, not in software. otherwise you could miss it. http://linuxcnc.org/docs/html/man/man9/hostmot2.9.html#encoder > > -Dave > > On Fri, 24 Apr 2020 17:25:00 -0400, andy pugh wrote: > > > On Fri, 24 Apr 2020 at 22:21, David Berndt wrote: > >> > >> Can anyone enlighten me as to how hm2_5i25.0.encoder.N.position seems to > >> get reset during homing to index? I assume somethnig is triggering > >> hm2_5i25.0.encoder.N.reset? > > > > The encoder counts reset when encoder.N.index-enable is true and an > > index is seen. > > You can detect this as the index-enable goes false a the same time. > > > ___ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Encoder reset on homing to index
Index-enable enable is true when index-enable is false? Who designed this? Politicians? I don't even know what to say as I try to wrap my mind around this one... Isn't there some sane/simple way to just tie the index-enable out bit from the one encoder to the index-enable in bit on the second encoder? If I have to setup a whole bunch of oneshot shenanigans for this I'm going to be very disappointed. -Dave On Fri, 24 Apr 2020 17:25:00 -0400, andy pugh wrote: On Fri, 24 Apr 2020 at 22:21, David Berndt wrote: Can anyone enlighten me as to how hm2_5i25.0.encoder.N.position seems to get reset during homing to index? I assume somethnig is triggering hm2_5i25.0.encoder.N.reset? The encoder counts reset when encoder.N.index-enable is true and an index is seen. You can detect this as the index-enable goes false a the same time. ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Encoder reset on homing to index
Just because I'm curious, Is this an absolute linear encoder or an incremental one (or may be it can work in both ways)? El vie., 24 abr. 2020 a las 18:28, andy pugh () escribió: > On Fri, 24 Apr 2020 at 22:21, David Berndt wrote: > > > > Can anyone enlighten me as to how hm2_5i25.0.encoder.N.position seems to > > get reset during homing to index? I assume somethnig is triggering > > hm2_5i25.0.encoder.N.reset? > > The encoder counts reset when encoder.N.index-enable is true and an > index is seen. > You can detect this as the index-enable goes false a the same time. > > -- > atp > "A motorcycle is a bicycle with a pandemonium attachment and is > designed for the especial use of mechanical geniuses, daredevils and > lunatics." > — George Fitch, Atlanta Constitution Newspaper, 1912 > > > ___ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Encoder reset on homing to index
On Fri, 24 Apr 2020 at 22:21, David Berndt wrote: > > Can anyone enlighten me as to how hm2_5i25.0.encoder.N.position seems to > get reset during homing to index? I assume somethnig is triggering > hm2_5i25.0.encoder.N.reset? The encoder counts reset when encoder.N.index-enable is true and an index is seen. You can detect this as the index-enable goes false a the same time. -- atp "A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils and lunatics." — George Fitch, Atlanta Constitution Newspaper, 1912 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Encoder reset on homing to index
Can anyone enlighten me as to how hm2_5i25.0.encoder.N.position seems to get reset during homing to index? I assume somethnig is triggering hm2_5i25.0.encoder.N.reset? But I don't see that plumbed up anywhere in my HAL. I'm adding a linear encoder to a servo axis and am retaining my servo homing, but when it homes I need to zero the linear encoder as well if the rotary is going to zero to avoid huge f-errors and other issues... Thanks, -Dave ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] cloning hard drive to new SSD
All the advice to use "dd" is OK. But it will spend hours copying many gigabytes of blank areas of the disk.I bet there is only a few megabytes of data you really need. The simple way is to make a bootable disk or SD card (or better an SSD) from scratch. Just the same way everyone installs from scratch. Then boot that drive, mount the old disk and copy those files you need across. This is MUCH faster. Buy a cheap USB SSD, it is much faster and more reliable than an SD card. Small ones are realy cheap now. But BEFORE you do anything at all BACKUP the important data off the failing drive. Do this twice then verify you can read the backups then place the backup someplace out of reach. No need to backup data you can download from the Internet. Only backup the files you made yourself. Then think about how to automate the backup so you never have to worry about losing data. Even SSDs can fail. Now that you have a safe backup make the new boot drive. I would not "clone" the old drive. On Wed, Apr 22, 2020 at 7:25 PM andrew beck wrote: > Hey guys. > > Just a quick question here > > I recently heard some funny clanking noises in my old 2nd hand hard drive > on my VMC and thought I better change it out and get a SSD in there. > > I have a bunch of stuff loaded onto the hardrive for probe basic gui and > other stuff and would like to clone the drive and keep everything. > > I can manage a windows cloning I am just not sure if the process will work > on a linux system. I am using a crucial brand SSD and can download the > drive cloning software (it is rebadged acronis cloning software) > > anyway some help would be appreciated. > > > regards > > Andrew > > ___ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Chris Albertson Redondo Beach, California ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
