Re: [Emc-users] howto linear encoder

[Jon Elson]

kqt4a...@gmail.com wrote:
> Is there hardware to go between the encoder and the parallel port to improve 
> the resolution and speed
> I see some break out boards have inputs for encoders
>   
Mesa and Pico Systems have boards that will read encoders with index 
pulse into
LinuxCNC.  These are much more than break out boards, they will do the
servo or stepper control, too.  These can't do anything for resolution on
digital encoders (unless the improved speed allows you to select a higher
resolution on adjustable encoders.)

Jon

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Re: [Emc-users] howto linear encoder

[Ralph Stirling]

FPGA boards like those from Mesa (7I43 etc) will remove
the parallel port as a limiting factor on speed,
but the resolution is dependent on the encoder
sensor and magnet.  If you want better resolution, you
would need to switch to the AS5311, which gives you
512 counts per mm.  I use that part with the 7I43 for
my linear motors.

-- Ralph

From: kqt4a...@gmail.com [kqt4a...@gmail.com]
Sent: Monday, November 19, 2012 11:44 AM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] howto linear encoder

On Thu, 15 Nov 2012, Ralph Stirling wrote:

> The AS5306 magnetic encoder module A and B outputs
> will certainly connect to the the parallel port fine.  You
> can configure Hal to do quadrature decoding from the
> parallel port, but your linear stage can't go very fast.
> The AS5306 has 40 pulses / 2.4mm = 16.7 pulses/mm.
> If I recall correctly, LinuxCNC can typically read maybe
> a couple thousand pulses per second from a quadrature
> encoder via the parallel port, so you would be limited to
> ~100-200mm/sec in speed.
>
> -- Ralph

Is there hardware to go between the encoder and the parallel port to improve 
the resolution and speed
I see some break out boards have inputs for encoders


> 
> From: Richard Ray [kqt4a...@gmail.com]
> Sent: Thursday, November 15, 2012 11:36 AM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] howto linear encoder
>
> On Thu, 15 Nov 2012, andy pugh wrote:
>
>> On 15 November 2012 19:13,   wrote:
>>> How might I connect this, or something similar, via a parallel port
>>> inexpensively, no MESA, to provide feedback for a stepper all running
>>> linuxcnc
>>
>> Is it quadrature output?
>>
>
> Yes
> The "this" above was suposed to be http://wiki.makerbot.com/mle
> Had a brain fart
>
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Re: [Emc-users] howto linear encoder

[kqt4at5v]

On Thu, 15 Nov 2012, Ralph Stirling wrote:

> The AS5306 magnetic encoder module A and B outputs
> will certainly connect to the the parallel port fine.  You
> can configure Hal to do quadrature decoding from the
> parallel port, but your linear stage can't go very fast.
> The AS5306 has 40 pulses / 2.4mm = 16.7 pulses/mm.
> If I recall correctly, LinuxCNC can typically read maybe
> a couple thousand pulses per second from a quadrature
> encoder via the parallel port, so you would be limited to
> ~100-200mm/sec in speed.
>
> -- Ralph

Is there hardware to go between the encoder and the parallel port to improve 
the resolution and speed
I see some break out boards have inputs for encoders


> 
> From: Richard Ray [kqt4a...@gmail.com]
> Sent: Thursday, November 15, 2012 11:36 AM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] howto linear encoder
>
> On Thu, 15 Nov 2012, andy pugh wrote:
>
>> On 15 November 2012 19:13,   wrote:
>>> How might I connect this, or something similar, via a parallel port
>>> inexpensively, no MESA, to provide feedback for a stepper all running
>>> linuxcnc
>>
>> Is it quadrature output?
>>
>
> Yes
> The "this" above was suposed to be http://wiki.makerbot.com/mle
> Had a brain fart
>
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Re: [Emc-users] howto linear encoder

[Gene Heskett]

On Thursday 15 November 2012 17:31:52 Ralph Stirling did opine:

> The AS5306 gives an index pulse every 2.4mm (pole pitch
> of the magnetic strip).  This is unlikely to be useful in most
> of our applications.  Any type of real index you will have to
> supply separately.
> 
> -- Ralph

I see, thanks.  And it occurs to me that if the linear strip was wrapped 
around my mills spindle, that some hal magic might be able to detect the 
index pulse as a discontinuity in the pulse train as the meeting but dis-
contiguous ends of the strip passed under it.  OTOH, that pcb's size would 
seem to demand an above the housing mounting for it.  They should have put 
the chip near the edge of the board for clearance to moving parts.

> 
> From: Gene Heskett [ghesk...@wdtv.com]
> Sent: Thursday, November 15, 2012 12:18 PM
> To: emc-users@lists.sourceforge.net
> Subject: Re: [Emc-users] howto linear encoder
> 
> On Thursday 15 November 2012 15:17:28 andy pugh did opine:
> > On 15 November 2012 19:36, Richard Ray  wrote:
> > > The "this" above was suposed to be http://wiki.makerbot.com/mle
> > > Had a brain fart
> > 
> > So, you need to connect it to the parallel port then run an encoder
> > HAL module. That appears to be all there is to it.
> 
> Not quite Andy, this kit is missing the index pulse wiring.
> 
> 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> is up!
> It is when I struggle to be brief that I become obscure.
> -- Quintus Horatius Flaccus (Horace)
> 
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Cheers, Gene
-- 
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 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
My web page: <http://coyoteden.dyndns-free.com:85/gene> is up!
 I can think of lots of people who need USER=ID10T someplace!

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Re: [Emc-users] howto linear encoder

[andy pugh]

On 15 November 2012 20:18, Gene Heskett  wrote:

> Not quite Andy, this kit is missing the index pulse wiring.

Index is of limited use on a linear encoder anyway, I suspect.

I have a number of magnetic crank position wheels in my desk at work,
I really ought to start experimenting.

-- 
atp
If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto

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Re: [Emc-users] howto linear encoder

[kqt4at5v]

On Thu, 15 Nov 2012, Gene Heskett wrote:

> On Thursday 15 November 2012 15:00:09 Richard Ray did opine:
>
>> On Thu, 15 Nov 2012, andy pugh wrote:
>>> On 15 November 2012 19:13,   wrote:
 How might I connect this, or something similar, via a parallel port
 inexpensively, no MESA, to provide feedback for a stepper all running
 linuxcnc
>>>
>>> Is it quadrature output?
>>
>> Yes
>> The "this" above was suposed to be http://wiki.makerbot.com/mle
>> Had a brain fart
>>
> Thats great, I grabbed the eagle stuff and BOM.  But I note that there is
> no index output on this board, so am I to assume that using the linear
> strip, cut to length and stuck on a rotating part, it will not generate a
> meaningful index pulse, and that to do that I would probably need to order
> a round magnetic wheel from one of the suppliers listed on the AMS page for
> that chip?
>
> However, I note that its companion, the on axis, magnetic rotary encoder
> also leaves out the index pulse that chip supplies.  So other than setting
> up a mechanical stop, and homing to that, and converting to Christian
> Science so you can believe it will hold true at 2500 rpms till the next
> powerdown, this is not going to be usable for a spindle position control.
> Bummer.

Or make youir own magnetic strips
http://forums.parallax.com/showthread.php?130799-Refrigerator-Magnet-Encoder

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Re: [Emc-users] howto linear encoder

[Ralph Stirling]

The AS5306 gives an index pulse every 2.4mm (pole pitch
of the magnetic strip).  This is unlikely to be useful in most
of our applications.  Any type of real index you will have to
supply separately.

-- Ralph

From: Gene Heskett [ghesk...@wdtv.com]
Sent: Thursday, November 15, 2012 12:18 PM
To: emc-users@lists.sourceforge.net
Subject: Re: [Emc-users] howto linear encoder

On Thursday 15 November 2012 15:17:28 andy pugh did opine:

> On 15 November 2012 19:36, Richard Ray  wrote:
> > The "this" above was suposed to be http://wiki.makerbot.com/mle
> > Had a brain fart
>
> So, you need to connect it to the parallel port then run an encoder HAL
> module. That appears to be all there is to it.

Not quite Andy, this kit is missing the index pulse wiring.

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> is up!
It is when I struggle to be brief that I become obscure.
-- Quintus Horatius Flaccus (Horace)

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Re: [Emc-users] howto linear encoder

[Gene Heskett]

On Thursday 15 November 2012 15:17:28 andy pugh did opine:

> On 15 November 2012 19:36, Richard Ray  wrote:
> > The "this" above was suposed to be http://wiki.makerbot.com/mle
> > Had a brain fart
> 
> So, you need to connect it to the parallel port then run an encoder HAL
> module. That appears to be all there is to it.

Not quite Andy, this kit is missing the index pulse wiring.

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:  is up!
It is when I struggle to be brief that I become obscure.
-- Quintus Horatius Flaccus (Horace)

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Re: [Emc-users] howto linear encoder

[Gene Heskett]

On Thursday 15 November 2012 15:00:09 Richard Ray did opine:

> On Thu, 15 Nov 2012, andy pugh wrote:
> > On 15 November 2012 19:13,   wrote:
> >> How might I connect this, or something similar, via a parallel port
> >> inexpensively, no MESA, to provide feedback for a stepper all running
> >> linuxcnc
> > 
> > Is it quadrature output?
> 
> Yes
> The "this" above was suposed to be http://wiki.makerbot.com/mle
> Had a brain fart
>
Thats great, I grabbed the eagle stuff and BOM.  But I note that there is 
no index output on this board, so am I to assume that using the linear 
strip, cut to length and stuck on a rotating part, it will not generate a 
meaningful index pulse, and that to do that I would probably need to order 
a round magnetic wheel from one of the suppliers listed on the AMS page for 
that chip?

However, I note that its companion, the on axis, magnetic rotary encoder 
also leaves out the index pulse that chip supplies.  So other than setting 
up a mechanical stop, and homing to that, and converting to Christian 
Science so you can believe it will hold true at 2500 rpms till the next 
powerdown, this is not going to be usable for a spindle position control.  
Bummer.
 
> 
> -- Monitor your physical, virtual and cloud infrastructure from a
> single web console. Get in-depth insight into apps, servers, databases,
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Cheers, Gene
-- 
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 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
My web page:  is up!
Toddlers are the stormtroopers of the Lord of Entropy.

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Re: [Emc-users] howto linear encoder

[Richard Ray]

On Thu, 15 Nov 2012, andy pugh wrote:

> On 15 November 2012 19:36, Richard Ray  wrote:
>
>> The "this" above was suposed to be http://wiki.makerbot.com/mle
>> Had a brain fart
>
> So, you need to connect it to the parallel port then run an encoder HAL 
> module.
> That appears to be all there is to it.
>

Great thanks

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Re: [Emc-users] howto linear encoder

[Richard Ray]

On Thu, 15 Nov 2012, Ralph Stirling wrote:

> The AS5306 magnetic encoder module A and B outputs
> will certainly connect to the the parallel port fine.  You
> can configure Hal to do quadrature decoding from the
> parallel port, but your linear stage can't go very fast.
> The AS5306 has 40 pulses / 2.4mm = 16.7 pulses/mm.
> If I recall correctly, LinuxCNC can typically read maybe
> a couple thousand pulses per second from a quadrature
> encoder via the parallel port, so you would be limited to
> ~100-200mm/sec in speed.
>

That is quite adequate

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Re: [Emc-users] howto linear encoder

[andy pugh]

On 15 November 2012 19:36, Richard Ray  wrote:

> The "this" above was suposed to be http://wiki.makerbot.com/mle
> Had a brain fart

So, you need to connect it to the parallel port then run an encoder HAL module.
That appears to be all there is to it.

-- 
atp
If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto

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Re: [Emc-users] howto linear encoder

[Ralph Stirling]

The AS5306 magnetic encoder module A and B outputs
will certainly connect to the the parallel port fine.  You
can configure Hal to do quadrature decoding from the
parallel port, but your linear stage can't go very fast.
The AS5306 has 40 pulses / 2.4mm = 16.7 pulses/mm.
If I recall correctly, LinuxCNC can typically read maybe
a couple thousand pulses per second from a quadrature
encoder via the parallel port, so you would be limited to
~100-200mm/sec in speed.

-- Ralph

From: Richard Ray [kqt4a...@gmail.com]
Sent: Thursday, November 15, 2012 11:36 AM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] howto linear encoder

On Thu, 15 Nov 2012, andy pugh wrote:

> On 15 November 2012 19:13,   wrote:
>> How might I connect this, or something similar, via a parallel port
>> inexpensively, no MESA, to provide feedback for a stepper all running
>> linuxcnc
>
> Is it quadrature output?
>

Yes
The "this" above was suposed to be http://wiki.makerbot.com/mle
Had a brain fart

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Re: [Emc-users] howto linear encoder

[Richard Ray]

On Thu, 15 Nov 2012, andy pugh wrote:

> On 15 November 2012 19:13,   wrote:
>> How might I connect this, or something similar, via a parallel port
>> inexpensively, no MESA, to provide feedback for a stepper all running
>> linuxcnc
>
> Is it quadrature output?
>

Yes
The "this" above was suposed to be http://wiki.makerbot.com/mle
Had a brain fart

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Re: [Emc-users] howto linear encoder

[andy pugh]

On 15 November 2012 19:13,   wrote:
> How might I connect this, or something similar, via a parallel port
> inexpensively, no MESA, to provide feedback for a stepper all running
> linuxcnc

Is it quadrature output?

-- 
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If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto

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