2013/8/6 Dave e...@dc9.tzo.com
A lot of it depends on how much power you need from the motors..and how
fast do you want your machine to move.
Then also what happens if you lose position on a stepper??
Dave
A well designed stepper system shouldn't loose steps, right? There are many
metal
On Mon, 8/5/13, andy pugh bodge...@gmail.com wrote:
Subject: Re: [Emc-users] Got a motor, now I need controls.
To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net
Date: Monday, August 5, 2013, 4:37 PM
On 5 August 2013 21:22, Gregg
Eshelman g_ala...@yahoo.com
wrote:
On Mon, 8/5/13, Kirk Wallace kwall...@wallacecompany.com wrote:
You will also need to close the feedback loop in LinuxCNC. I
don't recall anyone using a tachometer signal with LinuxCNC, but I
can't see that it would be too difficult. A quadrature encoder would
also work.
-
If
On Tue, 8/6/13, Sven Wesley svenne.d...@gmail.com wrote:
Subject: Re: [Emc-users] Planning phase for new machine, need decision support
To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net
Date: Tuesday, August 6, 2013, 12:17 AM
The palette I'm going to use as a table is
2013/8/6 Sven Wesley svenne.d...@gmail.com
The palette I'm going to use as a table is pretty heavy, and put a mould
half on top of that. That's at least 100 kg moving parts, maybe more. And I
want at least 5 m/min transport.
Max acceleration is what matters most for the motor. In my router
2013/8/6 Viesturs Lācis viesturs.la...@gmail.com
2013/8/6 Sven Wesley svenne.d...@gmail.com
The palette I'm going to use as a table is pretty heavy, and put a mould
half on top of that. That's at least 100 kg moving parts, maybe more.
And I
want at least 5 m/min transport.
Max
2013/8/6 Sven Wesley svenne.d...@gmail.com
2013/8/6 Viesturs Lācis viesturs.la...@gmail.com
2013/8/6 Sven Wesley svenne.d...@gmail.com
The palette I'm going to use as a table is pretty heavy, and put a mould
half on top of that. That's at least 100 kg moving parts, maybe more.
And I
2013/8/6 Sven Wesley svenne.d...@gmail.com
2013/8/6 Sven Wesley svenne.d...@gmail.com
2013/8/6 Viesturs Lācis viesturs.la...@gmail.com
2013/8/6 Sven Wesley svenne.d...@gmail.com
The palette I'm going to use as a table is pretty heavy, and put a
mould
half on top of that.
On 6 August 2013 07:31, Gregg Eshelman g_ala...@yahoo.com wrote:
If there's a way to use the tachometers along with the glass scales to
improve accuracy over just using the scales
Not with just a parallel port.
If you attach a Pico or Mesa card to the Parallel port, then maybe.
--
atp
If
Hi Kirk;
Can you get single steps to move the motor? I would try ...
All interesting suggestions. I did wish that the G540 could have
microstepping disabled, but does not seem possible.
It would appear (more stress testing today) that the issue was that I was
close to the speed limit on the
Something to remember w/ steppers is that they produce no torque at rest.
The maximum pullout torque is at 1/4 full step of error. W/ a typ 200 step
motor thats 1/800th of a revolution. W/ a 0.2(5tpi) leadscrew like on a
bridgeport that is 0.2/800= +-.00025 error depending on moving/cutting
Hi all;
Just for the email record in case others come by and google:
The Sieg KX1 mill I have has on X/Y axis YK57HB76-03A and on the Z
axis YK60HB86-04A
steppers.
This mill is sold by ArcEuroTrade, and LittleMachineShop (pn# 3501), plus
others, I'd guess. Mine came as a KX1-NU from Novakon
On Tue, 2013-08-06 at 09:13 -0400, Stephen Dubovsky wrote:
Something to remember w/ steppers is that they produce no torque at rest.
The maximum pullout torque is at 1/4 full step of error. W/ a typ 200 step
motor thats 1/800th of a revolution. W/ a 0.2(5tpi) leadscrew like on a
bridgeport
On Tue, Aug 6, 2013 at 9:41 AM, dave dengv...@charter.net wrote:
Too early in the morning and still on first cup of coffee but: if you are
within the 1/4
step (null) then increased feedback of some kind won't fix it.
It does fix it. The feedback will cause the control loop to shift the
I am in discussion with a chap who is retrofiting a Hardinge HXL. It
has linear scales, interpolator boxes set to 256x and is running a
5i25/7i77 combo.
The repeatability is good. Actually is is better than good, it returns
to the exact same digit on a 0.1um (0.04) length probe every
time.
On Tue, 6 Aug 2013, andy pugh wrote:
Date: Tue, 6 Aug 2013 16:25:38 +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: [Emc-users] A puzzler
Are the linear scales mechanically adjustable?
On Tue, Aug 6, 2013 at 10:25 AM, andy pugh bodge...@gmail.com wrote:
I am in discussion with a chap who is retrofiting a Hardinge HXL. It
has linear scales, interpolator boxes set to 256x and is running a
5i25/7i77 combo.
The repeatability is
Without thinking too much about it... would it not be 255? (in
computer terms - you don't start at 0)
sam
On 8/6/2013 10:25 AM, andy pugh wrote:
I am in discussion with a chap who is retrofiting a Hardinge HXL. It
has linear scales, interpolator boxes set to 256x and is running a
5i25/7i77
On 6 August 2013 16:36, Peter C. Wallace p...@mesanet.com wrote:
How fast is it going? this may to be close to the limits of the interpolator
and the 7I77 at say 100 mm/sec
Would it still return to the same position quite that well in that
case? I think he said he is moving it with a jogwheel,
2013/8/6 andy pugh bodge...@gmail.com
The problem is that the travel distance isn't accurate. A 50mm move is
out by 0.158mm. The encoder scale is set to 25600 (10um scales, 256
interpolation).
Is it always 0.158 or it changes with the lenght? Let him try it slow and
fast etc.
Andrew
On Tue, 6 Aug 2013, andy pugh wrote:
Date: Tue, 6 Aug 2013 16:44:12 +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] A
On 6 August 2013 16:41, Stuart Stevenson stus...@gmail.com wrote:
Are the linear scales mechanically adjustable?
I wouldn't have thought so, they are new Heidenhain scales (with
calibration certificate).
Part of me is saying he should just tweak the encoder scaling, but the
numbers he has look
On 6 August 2013 16:51, Andrew parallel.kinemat...@gmail.com wrote:
Is it always 0.158 or it changes with the lenght? Let him try it slow and
fast etc.
He initially reported an error of 70um in 2mm.
Though I am not sure if this was with the same instrument.
--
atp
If you can't fix it, you
1/25500 = 3.92156X10^-5 * 25600 * 50 = 50.196...
did I do that right? not exactly .158 though.. How is he measuring it?
latest email
1/25500 = 3.92156X10^-5 * 25600 * 2 = 2.0078 Aprox 70um?
sam
On 8/6/2013 10:25 AM, andy pugh wrote:
I am in discussion with a chap who is retrofiting a
On 08/06/2013 08:17 AM, Stephen Dubovsky wrote:
On Tue, Aug 6, 2013 at 9:41 AM, dave dengv...@charter.net wrote:
Too early in the morning and still on first cup of coffee but: if you are
within the 1/4
step (null) then increased feedback of some kind won't fix it.
It does fix it. The
Ok then which is correct? The new certified scale or whatever else is being
used to 'check' the scale?
On Tue, Aug 6, 2013 at 10:53 AM, andy pugh bodge...@gmail.com wrote:
On 6 August 2013 16:41, Stuart Stevenson stus...@gmail.com wrote:
Are the linear scales mechanically adjustable?
I
2013/8/6 Stephen Dubovsky smdubov...@gmail.com
It does fix it. The feedback will cause the control loop to shift the
commanded position away so that you ARE on the upslope of the torque
curve. Its fundamentally how servos work. You need to develop
Q(quadrature) current(flux) to get
On Tue, Aug 6, 2013, at 11:51 AM, Andrew wrote:
2013/8/6 andy pugh bodge...@gmail.com
The problem is that the travel distance isn't accurate. A 50mm move is
out by 0.158mm. The encoder scale is set to 25600 (10um scales, 256
interpolation).
Is it always 0.158 or it changes with the
On 6 August 2013 17:37, Stuart Stevenson stus...@gmail.com wrote:
Ok then which is correct? The new certified scale or whatever else is being
used to 'check' the scale?
I think he is using slip gauges / micrometer length standards and that
collet-mounted length probe.
0.158 is not a subtle
If the scale is off that far you may want to exchange it for a correctly
functioning scale.
A certified scale is supposed to be a master gage. When two master gages do
not agree there is a problem.
On Tue, Aug 6, 2013 at 11:53 AM, andy pugh bodge...@gmail.com wrote:
On 6 August 2013 17:37,
On 6 August 2013 18:02, Stuart Stevenson stus...@gmail.com wrote:
If the scale is off that far you may want to exchange it for a correctly
functioning scale.
I think the question is how to isolate the problem.
Between the scale, the interpolator, the 7i77, 7i25, LinuxCNC and PID
controller
On Tue, 2013-08-06 at 18:14 +0100, andy pugh wrote:
On 6 August 2013 18:02, Stuart Stevenson stus...@gmail.com wrote:
If the scale is off that far you may want to exchange it for a correctly
functioning scale.
I think the question is how to isolate the problem.
Between the scale, the
On Tue, 6 Aug 2013, andy pugh wrote:
Date: Tue, 6 Aug 2013 18:14:11 +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] A
On 6 August 2013 18:46, Peter C. Wallace p...@mesanet.com wrote:
Do you have the interpolator specifications?
https://docs.google.com/file/d/1gap4oQlfy43X7s-AZkXDH8gTI8L8HSQhr2rze8b8SEMmT_EyHwaHr7i8MGu1/edit?usp=sharing
some have quite large quadrature
distortion (large deviations from 90
I would be checking direction too, for any mechanical backlash error
I use a 2 travel tenths digital dial gauge for that sort of test
Dave Caroline
--
Get 100% visibility into Java/.NET code with AppDynamics Lite!
It's
On Tue, 6 Aug 2013, andy pugh wrote:
Date: Tue, 6 Aug 2013 18:53:45 +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] A
On 8/6/2013 12:42 PM, Sven Wesley wrote:
2013/8/6 Stephen Dubovskysmdubov...@gmail.com
It does fix it. The feedback will cause the control loop to shift the
commanded position away so that you ARE on the upslope of the torque
curve. Its fundamentally how servos work. You need to
I am starting new config with MESA 5i23, 7i49 and 8i20. I use latest dev
version.
Despite real and described in manual 8i20 pinout differences, I managed
to run servo motor. So, the first question: why manual and pinout differs?
Another strange thing I noticed is that 8i20 does not react to
On 6 August 2013 19:47, Peter C. Wallace p...@mesanet.com wrote:
Looks like 64X or 32X would be the maximum interpolation ratio without using a
higher mux frequency. 256X requires an equivalent counting frequency of about
8MHz. This is out of the range of muxed encoders.
Are you basing that
On Tue, 6 Aug 2013, propcoder wrote:
Date: Tue, 06 Aug 2013 22:55:41 +0300
From: propcoder marius.alks...@gmail.com
Reply-To: Enhanced Machine Controller (EMC)
emc-users@lists.sourceforge.net
To: emc-users@lists.sourceforge.net
Subject: [Emc-users] MESA 8i20 and enable signal
I am
On Tue, 6 Aug 2013, andy pugh wrote:
Date: Tue, 6 Aug 2013 22:23:35 +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] A
On 6 August 2013 20:55, propcoder marius.alks...@gmail.com wrote:
I couldn't find any input pin on 8i20 for enable too.
I am not sure about the rest, but because the enable inputs are
separate, they need to be driven by GPIO rather than anything that the
driver sends down the serial link.
--
On Tue, 6 Aug 2013, andy pugh wrote:
Date: Tue, 6 Aug 2013 22:23:35 +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] A
On 6 August 2013 22:50, Peter C. Wallace p...@mesanet.com wrote:
A.885 MHz signal is a 3.41 MHz count rate,
right at the 7I77s limits.
If you set the transition distance to .77 usec, the maximum count rate
will be 1.3 MHz so you will lose counts above 666 mm/min.
But I doubt he is
On 08/06/2013 10:25 AM, andy pugh wrote:
I am in discussion with a chap who is retrofiting a Hardinge HXL. It
has linear scales, interpolator boxes set to 256x and is running a
5i25/7i77 combo.
The repeatability is good. Actually is is better than good, it returns
to the exact same digit on
On Tue, 8/6/13, andy pugh bodge...@gmail.com wrote:
Subject: Re: [Emc-users] A puzzler
To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net
Date: Tuesday, August 6, 2013, 9:53 AM
On 6 August 2013 16:41, Stuart
Stevenson stus...@gmail.com
wrote:
Are the linear scales
On Tue, 8/6/13, andy pugh bodge...@gmail.com wrote:
The problem is that the travel distance isn't accurate. A
50mm move is out by 0.158mm. The encoder scale is set to 25600 (10um
scales, 256 interpolation).
It doesn't seem like it could be missed encoder counts or
the repeatability wouldn't
On Tue, Aug 6, 2013 at 9:13 AM, Stephen Dubovsky smdubov...@gmail.com wrote:
Something to remember w/ steppers is that they produce no torque at rest.
Here's what you have to remember about steppers: Zero torque at zero
speed, and zero torque at maximum speed :)
On 08/07/2013 12:36 AM, Peter C. Wallace wrote:
Despite real and described in manual 8i20 pinout differences, I managed
to run servo motor. So, the first question: why manual and pinout differs?
Which pinout differences? I am not aware of any
I mean driver parameters and pins and latest
I wired enable input correctly and measured the voltage between en- and
en+ with multimeter - they get 0 or 12V depending on LinuxCNC power state.
On 08/07/2013 12:43 AM, andy pugh wrote:
I am not sure about the rest, but because the enable inputs are
separate, they need to be driven by GPIO
On Tue, 8/6/13, TJoseph Powderly tjt...@gmail.com wrote:
cosine err?
the motion of the axis must be colinear with the motion of
the scale theres a few pages supplied wiht all Heidenhain scales
describing the mounting techniques and qualifications.
i could assume this has been verified, but
On Wed, 7 Aug 2013, propcoder wrote:
Date: Wed, 07 Aug 2013 05:55:54 +0300
From: propcoder marius.alks...@gmail.com
Reply-To: Enhanced Machine Controller (EMC)
emc-users@lists.sourceforge.net
To: emc-users@lists.sourceforge.net
Subject: Re: [Emc-users] MESA 8i20 and enable signal
Most stepper controllers have idle torque.
Some will have full torque at idle (stopped).
Most modern stepper controllers will have a selectable
idle torque and some will wait a few seconds
before switching from run torque to idle torque.
Hope this helps.
On Tue, Aug 6, 2013 at 10:11 PM,
53 matches
Mail list logo
