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. T
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?
> >
>
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
det
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 p
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 reso
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-aluminiu
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
When I needed to install a DRO on my mill, I found that toolmann had good
quality stuff, not too expensive and he will sell pieces. The scales appear to
be quadrature. try sa...@toolmann.net.
- Original Message -
From: emc-users-requ...@lists.sourceforge.net
To: emc-users@lists.source
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.
---
On Thu, 18 Feb 2016, Viesturs L?cis wrote:
> Date: Thu, 18 Feb 2016 23:01:37 +0200
> From: "[UTF-8] Viesturs L?cis"
> Reply-To: "Enhanced Machine Controller (EMC)"
>
> To: "Enhanced Machine Controller (EMC)"
> Subject: [Emc-users] Mesa 5i25 firmware - is there a mistake?
>
> Hello!
>
> I a
Hello!
I am trying to set up a cnc machine with 5 steppers that is supposed
to run with 5i25 card and simple breakout board.
I downloaded 5i25.zip file from mesanet.com webpage and found that
5i25_g540x2.bit might be the most appropriate firmware to use.
The problem is that in .pin file I see that
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
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 Eb
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 Els
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 ma
Dave,
I had toyed w/ replacing my glass scales and found the following on Ebay:
Here's a renishaw copy (new) of a linear magnetic read head:
http://www.ebay.com/itm/231172803441
The same guy was selling these: http://www.ebay.com/itm/231135218237 But,
looks like he's all out of them.
magnetic
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 soluti
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
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:
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