Re: [Emc-users] Linear / glass Scales

[Jon Elson]

On 02/19/2016 10:54 AM, Ralph Stirling wrote:
> I'm very intrigued by these Inductosyns.  I assume
> the several hundred mA drive is an AC waveform.
> What frequency is used?
In general, whatever you want, but for the AD2S1200 chip I 
use in my converter board, it is 10KHz,
sine wave.
>Obviously an amplifier is
> needed for the drive side.  Do you also need an amp
> on the sense side?
For a transformer-type resolver, they generally have ratios 
between 1:2 and 2:1, so a little range of excitation levels 
gets you the required output.  Inductosyns have such low 
turns coupling (the sense windings only cover a small 
fraction of the spar's winding) plus a big air gap, that the 
sensed signals are really weak.  So, you have to add an 
amplifier to the sense side.
>These appear to be two-phase
> (quadrature).  Aren't resolvers generally three-phase?
>
No, resolvers are unrolled control transformers, and are 
2-phase (sine and cosine).
Selsyns are 3-phase.

Jon


--
Site24x7 APM Insight: Get Deep Visibility into Application Performance
APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month
Monitor end-to-end web transactions and take corrective actions now
Troubleshoot faster and improve end-user experience. Signup Now!
http://pubads.g.doubleclick.net/gampad/clk?id=272487151=/4140
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Linear / glass Scales

[Ralph Stirling]

I'm very intrigued by these Inductosyns.  I assume
the several hundred mA drive is an AC waveform.
What frequency is used?  Obviously an amplifier is
needed for the drive side.  Do you also need an amp
on the sense side?  These appear to be two-phase
(quadrature).  Aren't resolvers generally three-phase?

-- Ralph


From: Jon Elson [el...@pico-systems.com]
Sent: Thursday, February 18, 2016 6:23 PM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] Linear / glass Scales

On 02/18/2016 01:23 PM, Nicklas Karlsson wrote:
> Do you know accuracy of the linear resolvers?
>
> I guess it would be possible to position an ordinary disc read head quite 
> accurate. Either one for DVD/CD or magnetic. How many bits are stored per 
> turn?
>
>
>
GE pin scales are fairly low resolution, they work by
varying reluctance of a stack of gauge pins passing between
excitation and pickup coils.  But, you might still get
~33,000 counts/inch, I think.

Inductosyns are pretty simple in concept, a plate with two
sections of serpentine PCB tracks, with them set up with a
90 degree shift between the two.  And, a spar with a
continuous serpentine running the whole length.  Then, you
have to drive several hundred mA through the spar.  With a
bit of an amplifier, you could get this to work with my
(Pico Systems) resolver converter board.  If the serpentine
repeated every .1", then you'd get 40960 counts/inch.
But, that might be too fine a pattern, requiring the two PC
boards to be awfully close.

Jon

--
Site24x7 APM Insight: Get Deep Visibility into Application Performance
APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month
Monitor end-to-end web transactions and take corrective actions now
Troubleshoot faster and improve end-user experience. Signup Now!
http://pubads.g.doubleclick.net/gampad/clk?id=272487151=/4140
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

--
Site24x7 APM Insight: Get Deep Visibility into Application Performance
APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month
Monitor end-to-end web transactions and take corrective actions now
Troubleshoot faster and improve end-user experience. Signup Now!
http://pubads.g.doubleclick.net/gampad/clk?id=272487151=/4140
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Linear / glass Scales (Disc position)

[Jerry Scharf]

Maybe these have changed a bunch since I looked at them, but the way they
*used to* work was there was a lead screw that did coarse positioning, then
a mirror and lens under audio frequency servo feedback loops looking at the
reflection pattern to see how close to the center of the pattern it is. The
light impacts the top surface at an almost 45 degree angle and only focuses
at the plane of the pits (mechanically presses in mass production disks.)
This helps prevent marks on the disk surface from blocking data read back.
The pit pattern is assumed to be neither concentric nor flat, and the servo
system is continuously adjusting to find the pattern center.

When you seek to an area of the disk, the lead screw positions to the
approximate area and you hope the first stop has the location wanted within
the mirror reach. The servos start locking in on the signal, then they read
whatever they find. In there are the time codes and chapter marks. It then
jumps the mirror a guessed amount, locks in more quickly since they have a
much better guess of the initial servo locking. Lather, rinse and repeat
till you get there.

The long and short of this is that the actual positioning accuracy of the
system is only moderate, but the servos are very cleverly built, signal
lock up is fairly quick and the data encodes a great deal about where you
are in the stream. None of this sounds good for what was asked.

jerry

On Thu, Feb 18, 2016 at 10:47 PM, Nicklas Karlsson <
nicklas.karlsso...@gmail.com> wrote:

> On Thu, 18 Feb 2016 20:47:28 -0800
> Chris Albertson  wrote:
>
> > On Thu, Feb 18, 2016 at 11:23 AM, Nicklas Karlsson
> >  wrote:
> >
> > > I guess it would be possible to position an ordinary disc read head
> quite accurate. Either one for DVD/CD or magnetic. How many bits are stored
> per turn?
> > >
> >
> > Those devices use the data that is recorded on the spinning platter to
> > determine where the read head is.  The head is then served to follow
> > the track.  It works well enough that is the spindle bearing is loose
> > the head can follow the track as it wobbles
> >
> > The CD/DVD track is a long spiral (alike on a vinyl record) so the
> > head must continually move if it is to read.  All of these are not
> > very good at absolute positioning
>
> They would be good at absolute positioning if a suitable pattern is added.
> It should also be possible to figure which bit is at position right now. At
> standstill I guess there would be a need for moving disc head.
>
> How good could it be? There have been extensive research on packing bits
> as tight as possible ==> how many bits are there per turn?
>
> Then in practice it is a matter of what could be bought.
>
>
> Nicklas Karlsson
>
>
> --
> Site24x7 APM Insight: Get Deep Visibility into Application Performance
> APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month
> Monitor end-to-end web transactions and take corrective actions now
> Troubleshoot faster and improve end-user experience. Signup Now!
> http://pubads.g.doubleclick.net/gampad/clk?id=272487151=/4140
> ___
> Emc-users mailing list
> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users
>



-- 
Jerry Scharf
FINsix IT
650.285.6361 w
650.279.7017 m
--
Site24x7 APM Insight: Get Deep Visibility into Application Performance
APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month
Monitor end-to-end web transactions and take corrective actions now
Troubleshoot faster and improve end-user experience. Signup Now!
http://pubads.g.doubleclick.net/gampad/clk?id=272487151=/4140
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Linear / glass Scales (Disc position)

[Nicklas Karlsson]

On Thu, 18 Feb 2016 20:47:28 -0800
Chris Albertson  wrote:

> On Thu, Feb 18, 2016 at 11:23 AM, Nicklas Karlsson
>  wrote:
> 
> > I guess it would be possible to position an ordinary disc read head quite 
> > accurate. Either one for DVD/CD or magnetic. How many bits are stored per 
> > turn?
> >
> 
> Those devices use the data that is recorded on the spinning platter to
> determine where the read head is.  The head is then served to follow
> the track.  It works well enough that is the spindle bearing is loose
> the head can follow the track as it wobbles
> 
> The CD/DVD track is a long spiral (alike on a vinyl record) so the
> head must continually move if it is to read.  All of these are not
> very good at absolute positioning

They would be good at absolute positioning if a suitable pattern is added. It 
should also be possible to figure which bit is at position right now. At 
standstill I guess there would be a need for moving disc head.

How good could it be? There have been extensive research on packing bits as 
tight as possible ==> how many bits are there per turn?

Then in practice it is a matter of what could be bought.


Nicklas Karlsson

--
Site24x7 APM Insight: Get Deep Visibility into Application Performance
APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month
Monitor end-to-end web transactions and take corrective actions now
Troubleshoot faster and improve end-user experience. Signup Now!
http://pubads.g.doubleclick.net/gampad/clk?id=272487151=/4140
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Linear / glass Scales

[Chris Albertson]

On Thu, Feb 18, 2016 at 11:23 AM, Nicklas Karlsson
 wrote:

> I guess it would be possible to position an ordinary disc read head quite 
> accurate. Either one for DVD/CD or magnetic. How many bits are stored per 
> turn?
>

Those devices use the data that is recorded on the spinning platter to
determine where the read head is.  The head is then served to follow
the track.  It works well enough that is the spindle bearing is loose
the head can follow the track as it wobbles

The CD/DVD track is a long spiral (alike on a vinyl record) so the
head must continually move if it is to read.  All of these are not
very good at absolute positioning


-- 

Chris Albertson
Redondo Beach, California

--
Site24x7 APM Insight: Get Deep Visibility into Application Performance
APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month
Monitor end-to-end web transactions and take corrective actions now
Troubleshoot faster and improve end-user experience. Signup Now!
http://pubads.g.doubleclick.net/gampad/clk?id=272487151=/4140
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Linear / glass Scales

[Chris Albertson]

On Thu, Feb 18, 2016 at 4:32 AM, Dave Cole  wrote:
>
>
>
> Never thought about the Enco catalog, good idea.
>
> The digital calipers; I think they have their own serial protocol?I
> could live with a 250 ms update time on the position so something like
> that could work if I could extract the position data
> without too much effort.


I thought you needed glass?  The calipers aren't.
But if stainless steel slides are OK you can get come pretty decent
ones from both eBay and Amazon.con for just under $100.
The best of this class are the AccuRemote for 8" you buy the 12" and
cut it to size.  Price is $62.  The serial data format is known
and there is open source code available to read it.The next step
up are the absolute type.  Also stainless for about $125.  No sure if
the
serial data on these been reverse engineered yet.  Also on Amazon.con
are the accusize brand glass scales which claim .0002" and cost
about $200 for the length you need.

I'm putting the $62 type in my Harbor Freight mini-mill and will use a
cheap $100 Android tablet as a remote wireless DRO display.



-- 

Chris Albertson
Redondo Beach, California

--
Site24x7 APM Insight: Get Deep Visibility into Application Performance
APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month
Monitor end-to-end web transactions and take corrective actions now
Troubleshoot faster and improve end-user experience. Signup Now!
http://pubads.g.doubleclick.net/gampad/clk?id=272487151=/4140
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Linear / glass Scales

[Jon Elson]

On 02/18/2016 01:23 PM, Nicklas Karlsson wrote:
> Do you know accuracy of the linear resolvers?
>
> I guess it would be possible to position an ordinary disc read head quite 
> accurate. Either one for DVD/CD or magnetic. How many bits are stored per 
> turn?
>
>
>
GE pin scales are fairly low resolution, they work by 
varying reluctance of a stack of gauge pins passing between 
excitation and pickup coils.  But, you might still get 
~33,000 counts/inch, I think.

Inductosyns are pretty simple in concept, a plate with two 
sections of serpentine PCB tracks, with them set up with a 
90 degree shift between the two.  And, a spar with a 
continuous serpentine running the whole length.  Then, you 
have to drive several hundred mA through the spar.  With a 
bit of an amplifier, you could get this to work with my 
(Pico Systems) resolver converter board.  If the serpentine 
repeated every .1", then you'd get 40960 counts/inch.
But, that might be too fine a pattern, requiring the two PC 
boards to be awfully close.

Jon

--
Site24x7 APM Insight: Get Deep Visibility into Application Performance
APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month
Monitor end-to-end web transactions and take corrective actions now
Troubleshoot faster and improve end-user experience. Signup Now!
http://pubads.g.doubleclick.net/gampad/clk?id=272487151=/4140
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Linear / glass Scales

[Dave Cole]

There are some very similar units on Ebay as well, but at higher prices.
Good to know that these work well..

Thanks,

Dave

On 2/18/2016 5:36 PM, Marshland Engineering wrote:
> Try here
>
> Great products with covers and mounting hardware.
>
> http://www.aliexpress.com/item/New-Design-5um-aluminium-alloy-DC10-optical-linear-scale-encoder-ruler-measuring-from-50-300mm/1697688495.html
>
> Cheers Wallace.
>
>
> --
> Site24x7 APM Insight: Get Deep Visibility into Application Performance
> APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month
> Monitor end-to-end web transactions and take corrective actions now
> Troubleshoot faster and improve end-user experience. Signup Now!
> http://pubads.g.doubleclick.net/gampad/clk?id=272487151=/4140
> ___
> Emc-users mailing list
> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users

--
Site24x7 APM Insight: Get Deep Visibility into Application Performance
APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month
Monitor end-to-end web transactions and take corrective actions now
Troubleshoot faster and improve end-user experience. Signup Now!
http://pubads.g.doubleclick.net/gampad/clk?id=272487151=/4140
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Linear / glass Scales

[TJoseph Powderly]

Hello Nicklas

On 02/19/2016 03:23 AM, Nicklas Karlsson wrote:
> Do you know accuracy of the linear resolvers?
http://www.ruhle.com/linear_transducers.htm
states +/-1um,
I was surprised it was not better
> I guess it would be possible to position an ordinary disc read head quite 
> accurate. Either one for DVD/CD or magnetic. How many bits are stored per 
> turn?
the reader 'head' of a linear resolver is more like 2 coils
http://decadal.gsfc.nasa.gov/PACE/PACE-IDL/Final_Report/Additional_Docs/Farrand_Resolvers/Farrand_Brochure.pdf

tomp

--
Site24x7 APM Insight: Get Deep Visibility into Application Performance
APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month
Monitor end-to-end web transactions and take corrective actions now
Troubleshoot faster and improve end-user experience. Signup Now!
http://pubads.g.doubleclick.net/gampad/clk?id=272487151=/4140
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Linear / glass Scales

[Marshland Engineering]

Try here

Great products with covers and mounting hardware. 

http://www.aliexpress.com/item/New-Design-5um-aluminium-alloy-DC10-optical-linear-scale-encoder-ruler-measuring-from-50-300mm/1697688495.html

Cheers Wallace. 


--
Site24x7 APM Insight: Get Deep Visibility into Application Performance
APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month
Monitor end-to-end web transactions and take corrective actions now
Troubleshoot faster and improve end-user experience. Signup Now!
http://pubads.g.doubleclick.net/gampad/clk?id=272487151=/4140
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Linear / glass Scales

[Nicklas Karlsson]

Do you know accuracy of the linear resolvers?

I guess it would be possible to position an ordinary disc read head quite 
accurate. Either one for DVD/CD or magnetic. How many bits are stored per turn?


On Fri, 19 Feb 2016 01:51:05 +0800
TJoseph Powderly  wrote:

> somebody with more time than me (tm)
> could try the linear resolvers like skunkworks had
> it looked as if they could be made as pcb's
> http://www.google.com/patents/US4705971
> http://www.analog.com/media/en/technical-documentation/application-notes/394309286AN263.pdf
> google for inductosyn
> 
> iirc Jon Elson has resolver to quadrature items
> iirc ICHaus has some chips
> 
> tomp
> 
> On 02/17/2016 03:52 PM, Dave Cole wrote:
>  I'm shopping for some linear/glass scales for a custom industrial 
>  machine.
> 
>  I only need to read 8" of travel.
> 
>  Does anyone know of an economical solution.I'd like full quad
>  outputs - ttl would be ideal.
>  I don't need super resolution or accuracy.  .001" would be sufficient.
> >
> 
> 
> --
> Site24x7 APM Insight: Get Deep Visibility into Application Performance
> APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month
> Monitor end-to-end web transactions and take corrective actions now
> Troubleshoot faster and improve end-user experience. Signup Now!
> http://pubads.g.doubleclick.net/gampad/clk?id=272487151=/4140
> ___
> Emc-users mailing list
> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users

--
Site24x7 APM Insight: Get Deep Visibility into Application Performance
APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month
Monitor end-to-end web transactions and take corrective actions now
Troubleshoot faster and improve end-user experience. Signup Now!
http://pubads.g.doubleclick.net/gampad/clk?id=272487151=/4140
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Linear / glass Scales

[Dave Cole]

All good info guys.
Those magnetic sensors are really appealing.  I want to try those.
Siko Global gave me a quote for some magnetic heads and 10" of tape and 
that setup is just under $700 for one sensor, tape and cable which is 
actually more than the Balluff sensors we were looking at.   That Ebay 
link for the Renishaw like sensors is really tempting.   Almost too good 
to be true.   I found out that the Balluff price we got for the 
magnetostrictive sensors were for two sensors for just under $1200 
including cables and sliding magnets so we are going to go with those.  
I was originally told that they were $1200 for one sensor setup, which I 
had a problem with.
The job is tight on time as they want the machine running by 3/15 and 
Balluff assembles their sensors in Kentucky which is close so we are 
heading in that direction.   I've use Balluff sensors P profile sensors 
before and they hold up really well.   Unless they are mangled, they 
typically never die.

Thanks,  Dave

On 2/18/2016 12:51 PM, TJoseph Powderly wrote:
> somebody with more time than me (tm)
> could try the linear resolvers like skunkworks had
> it looked as if they could be made as pcb's
> http://www.google.com/patents/US4705971
> http://www.analog.com/media/en/technical-documentation/application-notes/394309286AN263.pdf
> google for inductosyn
>
> iirc Jon Elson has resolver to quadrature items
> iirc ICHaus has some chips
>
> tomp
>
> On 02/17/2016 03:52 PM, Dave Cole wrote:
> I'm shopping for some linear/glass scales for a custom industrial machine.
>
> I only need to read 8" of travel.
>
> Does anyone know of an economical solution.I'd like full quad
> outputs - ttl would be ideal.
> I don't need super resolution or accuracy.  .001" would be sufficient.
>
> --
> Site24x7 APM Insight: Get Deep Visibility into Application Performance
> APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month
> Monitor end-to-end web transactions and take corrective actions now
> Troubleshoot faster and improve end-user experience. Signup Now!
> http://pubads.g.doubleclick.net/gampad/clk?id=272487151=/4140
> ___
> Emc-users mailing list
> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users

--
Site24x7 APM Insight: Get Deep Visibility into Application Performance
APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month
Monitor end-to-end web transactions and take corrective actions now
Troubleshoot faster and improve end-user experience. Signup Now!
http://pubads.g.doubleclick.net/gampad/clk?id=272487151=/4140
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Linear / glass Scales

[TJoseph Powderly]

somebody with more time than me (tm)
could try the linear resolvers like skunkworks had
it looked as if they could be made as pcb's
http://www.google.com/patents/US4705971
http://www.analog.com/media/en/technical-documentation/application-notes/394309286AN263.pdf
google for inductosyn

iirc Jon Elson has resolver to quadrature items
iirc ICHaus has some chips

tomp

On 02/17/2016 03:52 PM, Dave Cole wrote:
 I'm shopping for some linear/glass scales for a custom industrial machine.

 I only need to read 8" of travel.

 Does anyone know of an economical solution.I'd like full quad
 outputs - ttl would be ideal.
 I don't need super resolution or accuracy.  .001" would be sufficient.
>


--
Site24x7 APM Insight: Get Deep Visibility into Application Performance
APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month
Monitor end-to-end web transactions and take corrective actions now
Troubleshoot faster and improve end-user experience. Signup Now!
http://pubads.g.doubleclick.net/gampad/clk?id=272487151=/4140
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Linear / glass Scales

[Jon Elson]

On 02/18/2016 06:32 AM, Dave Cole wrote:
>
>
> Are the Chinese glass scales on Ebay ok from what you have heard?
> There is at least one 8" device for $200 or less listed.I like
> saving $$ but if the device is unreliable it will cause a lot of issues.
Well, I don't know.  Most likely, for a manually-moved axis, 
they will do fine, if you can keep them clean.  If moved 
through a lot of travel or dirt gets inside, then I'd guess 
the name brand units might be more robust.
> Never thought about the Enco catalog, good idea.
>
> The digital calipers; I think they have their own serial protocol?I
> could live with a 250 ms update time on the position so something like
> that could work if I could extract the position data
> without too much effort.
>
There are some documents on the net that tell how some 
people have deciphered the serial protocol and built their 
own readout boxes. Not all these units use the same 
protocol, so beware!

Jon

--
Site24x7 APM Insight: Get Deep Visibility into Application Performance
APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month
Monitor end-to-end web transactions and take corrective actions now
Troubleshoot faster and improve end-user experience. Signup Now!
http://pubads.g.doubleclick.net/gampad/clk?id=272487151=/4140
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Linear / glass Scales

[Kirk Wallace]

On 02/18/2016 04:32 AM, Dave Cole wrote:
>
>
> On 2/17/2016 9:17 PM, Jon Elson wrote:
>> On 02/17/2016 03:52 PM, Dave Cole wrote:
>>> I'm shopping for some linear/glass scales for a custom industrial machine.
>>>
>>> I only need to read 8" of travel.
>>>
>>> Does anyone know of an economical solution.I'd like full quad
>>> outputs - ttl would be ideal.
>>> I don't need super resolution or accuracy.  .001" would be sufficient.

There are a few linear encoder designs floating around The Net that are 
based on using a wire or ribbon that turns a cheap rotary encoder. 
Hmmm... well there used to be some designs, but I can't seem to find any 
off hand. The basic idea is similar to the linear position mechanism in 
floppy drives, using a metal ribbon fixed at one end, then wrapped 
around the encoder shaft, and fixed at the other end with a spring to 
take up any slop.

Or use a rack and pinion to turn the rotary encoder.

USDigital.com also has some less expensive linear solutions.
http://usdigital.com/products/encoders/incremental/linear/LIN


-- 
Kirk Wallace
http://www.wallacecompany.com/machine_shop/
http://www.wallacecompany.com/E45/

--
Site24x7 APM Insight: Get Deep Visibility into Application Performance
APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month
Monitor end-to-end web transactions and take corrective actions now
Troubleshoot faster and improve end-user experience. Signup Now!
http://pubads.g.doubleclick.net/gampad/clk?id=272487151=/4140
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Linear / glass Scales

[Dave Cole]

On 2/17/2016 9:17 PM, Jon Elson wrote:
> On 02/17/2016 03:52 PM, Dave Cole wrote:
>> I'm shopping for some linear/glass scales for a custom industrial machine.
>>
>> I only need to read 8" of travel.
>>
>> Does anyone know of an economical solution.I'd like full quad
>> outputs - ttl would be ideal.
>> I don't need super resolution or accuracy.  .001" would be sufficient.
>>
>>
> Most since the early 1980's are metric.  So, 25 um
> quadrature count is .0009843".  Therefore, a scale with 100
> um line spacing would give you that resolution.  Just look
> on eBay.  Especially, 8" or so scales should turn up, they
> are less useful for machine conversions.
>
> If you want brand new, there are a bunch of outfits making
> DRO systems, and many of them still use glass scales.
> Check the Enco catalog, they used to allow you to buy just
> the scales.
>
> There are also things that are essentially digital calipers
> with the measuring jaws left off, and they generally do NOT
> have quadrature output.  Possibly they could tell you by
> phone which is which.
>
> Jon

Are the Chinese glass scales on Ebay ok from what you have heard?
There is at least one 8" device for $200 or less listed.I like 
saving $$ but if the device is unreliable it will cause a lot of issues.

Never thought about the Enco catalog, good idea.

The digital calipers; I think they have their own serial protocol?I 
could live with a 250 ms update time on the position so something like 
that could work if I could extract the position data
without too much effort.

Thanks,  Dave


--
Site24x7 APM Insight: Get Deep Visibility into Application Performance
APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month
Monitor end-to-end web transactions and take corrective actions now
Troubleshoot faster and improve end-user experience. Signup Now!
http://pubads.g.doubleclick.net/gampad/clk?id=272487151=/4140
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Linear / glass Scales

[Dave Cole]

Thanks Philipp,

This is for an industrial machine and the competition is a Baluff sensor 
which measures over an 8" stroke.  The quote for the Baluff device came 
back at almost $1200.
So it shouldn't be too difficult to beat that price, I hope!  :-)

I sent Siko an inquiry.

Dave

On 2/17/2016 5:10 PM, Philipp Burch wrote:
> Hi Dave!
>
> On 17.02.2016 22:52, Dave Cole wrote:
>> I'm shopping for some linear/glass scales for a custom industrial machine.
>>
>> I only need to read 8" of travel.
>>
>> Does anyone know of an economical solution.I'd like full quad
>> outputs - ttl would be ideal.
>> I don't need super resolution or accuracy.  .001" would be sufficient.
> If you don't need super accuracy, you could probably head for a magnetic
> solution instead of a glass scale. One such supplier is Siko Magline:
> https://www.siko-global.com/en-de/products/magline-magnetic-linear-and-angular-measurement
> But those are probably not the most "economic" (i.e. cheap) ones. If you
> feel like doing almost everything on your own, you could also just use
> one of their magnet bands and mount a position sensor (raw SMD part)
> like an AS5311:
> http://ams.com/eng/Products/Position-Sensors
>
> Bye,
> Philipp
>
>
>
> --
> Site24x7 APM Insight: Get Deep Visibility into Application Performance
> APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month
> Monitor end-to-end web transactions and take corrective actions now
> Troubleshoot faster and improve end-user experience. Signup Now!
> http://pubads.g.doubleclick.net/gampad/clk?id=272487151=/4140
>
>
> ___
> Emc-users mailing list
> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users
--
Site24x7 APM Insight: Get Deep Visibility into Application Performance
APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month
Monitor end-to-end web transactions and take corrective actions now
Troubleshoot faster and improve end-user experience. Signup Now!
http://pubads.g.doubleclick.net/gampad/clk?id=272487151=/4140
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Linear / glass Scales

[Jon Elson]

On 02/17/2016 03:52 PM, Dave Cole wrote:
> I'm shopping for some linear/glass scales for a custom industrial machine.
>
> I only need to read 8" of travel.
>
> Does anyone know of an economical solution.I'd like full quad
> outputs - ttl would be ideal.
> I don't need super resolution or accuracy.  .001" would be sufficient.
>
>
Most since the early 1980's are metric.  So, 25 um 
quadrature count is .0009843".  Therefore, a scale with 100 
um line spacing would give you that resolution.  Just look 
on eBay.  Especially, 8" or so scales should turn up, they 
are less useful for machine conversions.

If you want brand new, there are a bunch of outfits making 
DRO systems, and many of them still use glass scales.
Check the Enco catalog, they used to allow you to buy just 
the scales.

There are also things that are essentially digital calipers 
with the measuring jaws left off, and they generally do NOT 
have quadrature output.  Possibly they could tell you by 
phone which is which.

Jon

--
Site24x7 APM Insight: Get Deep Visibility into Application Performance
APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month
Monitor end-to-end web transactions and take corrective actions now
Troubleshoot faster and improve end-user experience. Signup Now!
http://pubads.g.doubleclick.net/gampad/clk?id=272487151=/4140
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Linear / glass Scales

[Philipp Burch]

Hi Dave!

On 17.02.2016 22:52, Dave Cole wrote:
> 
> I'm shopping for some linear/glass scales for a custom industrial machine.
> 
> I only need to read 8" of travel.
> 
> Does anyone know of an economical solution.I'd like full quad 
> outputs - ttl would be ideal.
> I don't need super resolution or accuracy.  .001" would be sufficient.

If you don't need super accuracy, you could probably head for a magnetic
solution instead of a glass scale. One such supplier is Siko Magline:
https://www.siko-global.com/en-de/products/magline-magnetic-linear-and-angular-measurement
But those are probably not the most "economic" (i.e. cheap) ones. If you
feel like doing almost everything on your own, you could also just use
one of their magnet bands and mount a position sensor (raw SMD part)
like an AS5311:
http://ams.com/eng/Products/Position-Sensors

Bye,
Philipp



signature.asc
Description: OpenPGP digital signature
--
Site24x7 APM Insight: Get Deep Visibility into Application Performance
APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month
Monitor end-to-end web transactions and take corrective actions now
Troubleshoot faster and improve end-user experience. Signup Now!
http://pubads.g.doubleclick.net/gampad/clk?id=272487151=/4140___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users