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.
>
-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 accur
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.
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
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 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
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
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.
>
>
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.
Viesturs L?cis)
7. Re: Mesa 5i25 firmware - is there a mistake? (Peter C. Wallace)
--
Message: 1
Date: Thu, 18 Feb 2016 09:17:29 -0800
From: Mark Johnsen <m...@ijohnsen.com>
Subject: [Emc-users] Linear / glass Scale
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.
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
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
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
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
t;
> Subject: [Emc-users] Linear / glass Scales
> To: emc-users@lists.sourceforge.net
> Message-ID: <56c4ebb7.2040...@gmail.com>
> Content-Type: text/plain; charset=windows-1252; format=flowed
>
>
> I'm shopping for some linear/glass scales for a custom industrial machin
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
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
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
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
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
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.
Thanks,
Dave
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