Accurate Measureing Systems in St. Louis repairs these. They do all of my
scale work. There is no one better on these scales. Contact Ed and tell him
that Dave from Eagle Tool sent you. He has completely rebuilt scales and
tested them for $90.00 bucks before. (Depends on the unit) He has more spare
parts than the OEM. He also has some used units for cheap.
Dave
----- Original Message -----
From: "Chris Morley" <[EMAIL PROTECTED]>
To: "Enhanced Machine Controller (EMC)" <[email protected]>
Sent: Sunday, February 24, 2008 12:11 AM
Subject: Re: [Emc-users] Cordax CMM
>
> I am certainly not an expert but have read quite a bit-others can correct
> me....
> hmm . From what I remember Heidenhain takes those four signals and
> superimposes them into two signals. This creates a sin wave on each wire
> pair (of two pairs) that cross zero. Then you can get a black box that
> converts that to quadrature. Basically the photodiodes are wired together-
> in parallel -and in opposite polarity. This creates a push-pull signal
> (which is the two signals superimposed). There are two such signal
> 'groups', offset so as to create a quadrature relationship.
>
> There are two types of sin signals that are common current (11-16 micro
> amps) and voltage (1vpp).
> When you say there are four wires does that mean four wires with a common
> ground or four sets of wires (two for each signal)?
>
> The other question is what about replacing the encoders with something
> more common (like from ebay)? What are the lengths and accuracy needed?
>
> Just for reference if you can wire your encoders to create standard sin
> signals the 'black box' to convert to square waves would cost aprox. $50
> from ebay (oem price is something like $800 or more ) . They come in a
> variety of signal multiplying options.
>
> my $.002
>
> Chris Morley
>
>> Sheffield has the replacement parts BUT the expense is incredible.
>> The bulbs, just the little bulbs not the read head, were $160.00 each.
>> I haven't priced the amplifier/converter board. I am afraid to. I
>> don't think I even want to know.
>> SO ----
>> The scale feedback to the DRO is four wires with a sin wave on
>> each. These are supposed to be 0, 90, 180 and 270 degrees. Is there a
>> way to convert the sin wave into a pulse? If I can convert the sin
>> wave to a pulse I will hook two of the pulse signals from each axis to
>> a soft encoder in EMC2 and have an EMC2 CMM.
>>
>
> _________________________________________________________________
>
>
> -------------------------------------------------------------------------
> This SF.net email is sponsored by: Microsoft
> Defy all challenges. Microsoft(R) Visual Studio 2008.
> http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
> _______________________________________________
> Emc-users mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/emc-users
>
-------------------------------------------------------------------------
This SF.net email is sponsored by: Microsoft
Defy all challenges. Microsoft(R) Visual Studio 2008.
http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
_______________________________________________
Emc-users mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/emc-users
