On 5/25/2011 9:26 PM, Jon Elson wrote:
Dave wrote:
How would that SSI to quadrature encoder work? The nice thing about
SSI is that when the power goes on, the motion system knows exactly
where it is without homing or moving.
That only works if a memory is kept alive to
SNIP-
In my quest to get replacement encoders, Heidenhain told me that SSI
encoders are becoming scarce as Endat has become a much more popular
interface for encoders (or at least the ones they sell).
Dave
They (perhaps
Also, CUI has added a version of their AMT encoders that produce commutation
signals as well as traditional ABZ, if you need this on a brushless motor.
Jon
--
vRanger cuts backup time in half-while increasing security.
The guys I have been talking to are the Encoder Technicians - not the
marketing guys so their observations regarding SSI vs Endat volume is
simply what they see as being popular from a Heidenhain perspective.
I don't think that BISS encoders are sold by Heidenhain since they are
pushing Endat,
On Thu, 26 May 2011, Dave wrote:
Date: Thu, 26 May 2011 15:13:41 -0400
From: Dave e...@dc9.tzo.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] Hydraulic
Does Mesa already
handle
this protocol?
Peter said that they can get the data into the hardware but that there
is no driver support for it yet.
I need to get an SSI encoder.
Dave
On 5/24/2011 9:09 PM, Jon Elson wrote:
Dave wrote:
The machine already has Rexroth amplifier cards for the
Dave wrote:
Does Mesa already
handle
this protocol?
Peter said that they can get the data into the hardware but that there
is no driver support for it yet.
I need to get an SSI encoder.
Well, it seems like it wouldn't be all that hard to adapt my PPMC
encoder card to handle
How would that SSI to quadrature encoder work? The nice thing about
SSI is that when the power goes on, the motion system knows exactly
where it is without homing or moving.
I'm trying to find an encoder now.The best I have found far on the
surplus market is a 360 count per rev unit
On 25 May 2011 18:45, Dave e...@dc9.tzo.com wrote:
How would that SSI to quadrature encoder work? The nice thing about
SSI is that when the power goes on, the motion system knows exactly
where it is without homing or moving.
The way my Arduino-based resolver-to-quadrature converter works
On Wed, 25 May 2011, andy pugh wrote:
Date: Wed, 25 May 2011 19:10:35 +0100
From: andy pugh bodge...@gmail.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] Hydraulic
On 25 May 2011 19:32, Peter C. Wallace p...@mesanet.com wrote:
If you had a position start input pin, you could avoid any startup race
conditions by outputing the counts only after the start signal was removed.
That is on my list of things to try, but I haven't got round to doing yet.
--
atp
Dave wrote:
How would that SSI to quadrature encoder work? The nice thing about
SSI is that when the power goes on, the motion system knows exactly
where it is without homing or moving.
That only works if a memory is kept alive to remember the rotation count
(assuming shaft
Guys...
Thanks for all of the tips and suggestions regarding the use of EMC2
with a servo hydraulic system.
I need to get an SSI encoder and try some things out.
Jon,
The machine already has Rexroth amplifier cards for the valves that have
the dither function built in. They accept +/- 10
On 24 May 2011 21:45, Dave e...@dc9.tzo.com wrote:
The SSI encoder protocol is out in the public domain.
http://en.wikipedia.org/wiki/Synchronous_Serial_Interface
I wonder if an SPI interface can read an SSI device? (it seems that
you could just ignore the select and data lines)
--
atp
Dave wrote:
The machine already has Rexroth amplifier cards for the valves that have
the dither function built in. They accept +/- 10 volt analog signals
to shift the valve.
How convenient!
The SSI encoder protocol is out in the public domain.
Dave wrote:
Does anyone have any experience in controlling servo grade hydraulic
proportional valves with EMC2 for use in controlling a number of
hydraulic cylinders?
Yes, sort of. You need a linear amplifier that can turn +/- 10 V
signals into current
in the proportional servo valve.
there is always slipstick around the 0 point. But on a reasonable slow
system that does not seem to cause problems.
jan.
On Sat, May 21, 2011 at 3:53 AM, gene heskett ghesk...@wdtv.com wrote:
On Friday, May 20, 2011 09:46:59 PM Dave did opine:
Does anyone have any experience in controlling
Does anyone have any experience in controlling servo grade hydraulic
proportional valves with EMC2 for use in controlling a number of
hydraulic cylinders?
Does anyone know of a way to interface an SSI encoder into EMC2?
I need to retrofit a large hydraulically controlled machine and the
On Fri, 20 May 2011, Dave wrote:
Date: Fri, 20 May 2011 12:40:10 -0400
From: Dave e...@dc9.tzo.com
Reply-To: Enhanced Machine Controller (EMC)
emc-users@lists.sourceforge.net
To: emc-users@lists.sourceforge.net
Subject: [Emc-users] Hydraulic Position control with EMC2
Does anyone
On Friday, 20 May 2011, Dave e...@dc9.tzo.com wrote:
Does anyone have any experience in controlling servo grade hydraulic
proportional valves with EMC2
No, but I do have a bit of experience with servo-hydraulic machines,
Specifically Schenck testing machines. I have occasionally thought
that
EMC will just work I would say. The servo factors will be a bit more tricky
to set up, since there is now no speed stabilizing loop around the motor /
drive.
I know old hydraulic copy mills quite well: they work just perfect if set up
properly. When not there is a bit of overshoot etc.
jan.
On
just this:
CLEAN oil and CLEAN servo valves and a CLEAN system!!
the pilot holes are in the order of tenths of mm. I normally carry a
dentists root canal drill (the smallest) in my box.
So I can do emergency cleaning of the valves. The proper job is like $2000.-
US. That is a bit steep, specially
one of my next projects is to see if we can get an old Cincinnati lathe
running that has hydraulic servos. We plan on running it with emc (of
course) and want to try initially just driving the valves.
http://www.electronicsam.com/images/KandT/cincinnatimi/valve.JPG
On Friday, May 20, 2011 09:46:59 PM Dave did opine:
Does anyone have any experience in controlling servo grade hydraulic
proportional valves with EMC2 for use in controlling a number of
hydraulic cylinders?
Does anyone know of a way to interface an SSI encoder into EMC2?
I need to
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