I recently noticed that someone sells an encoder that intended as a resolver replacement. I have not checked price, but I thought I might use some (someday) for a LeBlond lathe retrofit that is sitting on the back burner right now. It uses a total of 5 resolvers and/or synchros. This would allow the same physical mounting as the resolvers, but with the desired encoder output.
No mechanical changes would be a good thing in my case, due to the mounting arraignment of at least two of them. They are mounted to hand wheels through a gear train that also is motor driven when using the hand wheels in "power feed" mode.
I had planned to use resolver to encoder conversion ICs (Analog Devices makes some - ADS90 or something I think), or a commercial conversion board (Computer Conversions, I think). Neither of these choices seemed as direct a solution as physical replacement. I guess if the cost and performance is similar (if not better), less components is the preferred option.
They also make a handheld pulse generator with selector switches for axis select and scale factor, and other options. I just bought one for a mill retrofit, but have not used it yet.
http://www.cui.com/encoders/encd_tools.htm
Regards,
Steve
Dave Engvall wrote:
Hi Paul;
Thanks for the guidance. Will give it try sometime down the road. Am up to
my ears in alligators on the Mazak. It should be fun when I get it running
though. All of it takes time. I just got one of the resolvers swapped out
for an encoder. Only two more to go. Not much room to play with; I'm going
to try a modular encoder for the next one.If someone is going to do a PCI replacement for the Dan's board they might
socket it for a 4 channel DAC: then someone has the option of populating it
later on.Dave
On 12/19/02 12:38 PM, "Paul" <paul.corner-at-tesco.net> wrote:
>
>
> Hi Dave
>
> Take the extstgmot.c source code, and using it as an example, add extDAC**
> functions to extsmdromot.c - Include the extAio** functions as well, but
> these can just be stubs that "return 0;".
> In the emcmot/Makefile, I'd suggest using stgmod.o for this as it is the
> first one in the list - Replace the reference to stg.o with dro.o and do a
> "make PLAT=$RTPLAT".
>
> This will give you the basic analog outputs and encoder inputs and digital IO
> via the parallel port. The parport base address will be hard coded to 278 as
> defined in parport.h.
>
> Some of this is documented in the source notes in emc/documents, and also in
> a pdf doc to be found at http://www.linuxcnc.org/BDI/index.html
>
>
> Regards, Paul.
>
>
>
> On Thursday 19 Dec 2002 5:24 pm, Dave Engvall wrote:
>> The
>> code for the D/A is only a few lines but I didn't know enough to link it to
>> emc.
>
--
Steve White
V.P. Director of Technology
Lomar Machine & Tool Co.
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