Re: [Emc-users] More Renishaw questions

[Jon Elson]

On 03/26/2017 04:23 AM, Dave Caroline wrote:
> I have tried a SFH213 Photodiode with a comparator but it is a bit
> fiddly and not that sensitive, will try a QSE159 when it arrives.
>
>
I don't know exactly what they are doing, the data sheet is 
pretty sparse on details, but it seems they must have some 
feedback in the amplifier to keep it just below the trigger 
threshold without IR pulses.

It seemed to work well over quite a good range, although I 
suspect with the 12 LEDs that the Blum probe puts out a lot 
of IR.  I did work with a photodiode and oscilloscope, and 
could only see signals on the scope from a few inches away.  
So, the QSE159 ought to help out quite a bit.

Jon

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Re: [Emc-users] More Renishaw questions

[Dave Caroline]

I have tried a SFH213 Photodiode with a comparator but it is a bit
fiddly and not that sensitive, will try a QSE159 when it arrives.

Dave Caroline

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Re: [Emc-users] More Renishaw questions

[Jon Elson]

On 03/23/2017 02:09 PM, Ken Strauss wrote:
> I haven't managed to find an OMM + MI7 for an affordable price (this is only
> a hobby). My current plan (hope) is to build the equivalent of an OMM. I
> assume that what is required is something like a Vishay TEMD1000 photodiode
> feeding a TIA and then follow with an Arduino or something similar to decode
> the contact/battery low signals. It would be great if I could start with
> something that is known to work to acquire the IR signal.
>
I can't say for the Renishaw, but I used QSE159 sensor 
module from Digi-Key.  Made by Fairchild, it is a sensitive 
IR detector with amplifier and comparator all built in.  It 
is one of the few that is NOT set up to sense 40 KHz or 
whatever frequency is used by IR remote controls for 
entertainment devices.  It worked great for picking up the 
output of my Blum probe.  It has a dozen IR LEDs wrapped 
around the circumference of the probe to send condition back 
to the IR interface.

Jon

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Re: [Emc-users] More Renishaw questions

[Ken Strauss]

Switch on is not a problem for me since the MP7 has an inbuilt centrifugal
power switch according to the docs -- spin the probe at 500 rpm for a few
seconds to turn on and then spin it again to turn off. I would appreciate
any information on your homebrew OMM that you're willing to share. Please
keep us informed of any web details.

> -Original Message-
> From: Dave Caroline [mailto:dave.thearchiv...@gmail.com]
> Sent: Friday, March 24, 2017 12:01 AM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] More Renishaw questions
>
> Ken I have a LT02 and that is switched on by a just about any infrared
pulse
> waveform and the return appears to be 115k baud optical, I am building my
> own OMM with an arduino MI as soon as I get around to it, had to get a
fast
> opto diode an opto transistor I first obtained was deaf and too slow (less
than
> an inch to get a signal)
>
> Results will be on the web soon.
>
> Dave Caroline
>
>

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Re: [Emc-users] More Renishaw questions

[Dave Caroline]

Ken I have a LT02 and that is switched on by a just about any infrared
pulse waveform and the return appears to be 115k baud optical, I am
building my own OMM with an arduino MI as soon as I get around to it,
had to get a fast opto diode an opto transistor I first obtained was
deaf and too slow (less than an inch to get a signal)

Results will be on the web soon.

Dave Caroline

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Re: [Emc-users] More Renishaw questions

[andy pugh]

On 23 March 2017 at 18:28, Ken Strauss  wrote:
> >From postings on this list earlier this year I believe that Sarah Armstrong
> and Rene Hopf (and perhaps others) have had some success interfacing to a
> Renishaw MP10 or similar probe. I recently got an MP7 so I'm very interested.

I decided not to bother with the inductive link on mine, and only
retained the probe itself, hard-wiring it to a GPIO.
I got a little bit fancy with a home-made "Magsafe" style connector,
in case I ever forgot to remove it before starting the spindle.

This approach saves me a fair bit of headroom, which is a plus with my
small mill.

https://goo.gl/photos/snGgoumya4gXL3Ar8

I kept the ball interface betwixt the probe and the arbour, there is a
gap where the screws are to allow the probe-ball to be centred.

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1916

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Re: [Emc-users] More Renishaw questions

[Ken Strauss]

I haven't managed to find an OMM + MI7 for an affordable price (this is only
a hobby). My current plan (hope) is to build the equivalent of an OMM. I
assume that what is required is something like a Vishay TEMD1000 photodiode
feeding a TIA and then follow with an Arduino or something similar to decode
the contact/battery low signals. It would be great if I could start with
something that is known to work to acquire the IR signal.

> -Original Message-
> From: Erik Friesen [mailto:e...@aercon.net]
> Sent: Thursday, March 23, 2017 2:39 PM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] More Renishaw questions
>
> Do you have an OMI, or are you trying to connect directly with your own?
>
> On Thu, Mar 23, 2017 at 2:28 PM, Ken Strauss <ken.stra...@sympatico.ca>
> wrote:
>
> > >From postings on this list earlier this year I believe that Sarah
> > Armstrong
> > and Rene Hopf (and perhaps others) have had some success interfacing
> > to a Renishaw MP10 or similar probe. I recently got an MP7 so I'm very
> > interested.
> >
> > Can anyone provide details of the electronics that they used used to
> > detect and cleanup the IR signal? What was the range for reliable
pickup?
> >
> >
> >
> > 
> > --
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> > https://lists.sourceforge.net/lists/listinfo/emc-users
> >
>

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Re: [Emc-users] More Renishaw questions

[Erik Friesen]

Do you have an OMI, or are you trying to connect directly with your own?

On Thu, Mar 23, 2017 at 2:28 PM, Ken Strauss 
wrote:

> >From postings on this list earlier this year I believe that Sarah
> Armstrong
> and Rene Hopf (and perhaps others) have had some success interfacing to a
> Renishaw MP10 or similar probe. I recently got an MP7 so I'm very
> interested.
>
> Can anyone provide details of the electronics that they used used to detect
> and cleanup the IR signal? What was the range for reliable pickup?
>
>
>
> 
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[Emc-users] More Renishaw questions

[Ken Strauss]

>From postings on this list earlier this year I believe that Sarah Armstrong 
and Rene Hopf (and perhaps others) have had some success interfacing to a 
Renishaw MP10 or similar probe. I recently got an MP7 so I'm very interested.

Can anyone provide details of the electronics that they used used to detect 
and cleanup the IR signal? What was the range for reliable pickup?



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