On Saturday 04 August 2007, Jon Elson wrote:
>Gene Heskett wrote:
>> With the eval board at $150, and I doubt it comes with the rotary coil
>> set, that raises the price of that toy quite a bit unless someone here
>> wants to see if they can squeeze it into say $50 for a run of 100 or so.
>>
>> With the accuracy claimed, I can see it will take some means to diddle
>> coil positions while the spindle is locked very accurately at 90 degree
>> increments in order to achieve the accuracy claimed over a full
>> revolution. This obviously is going to make the mechanical portion pretty
>> expensive too.
>
>The rotary coils are your resolver. Your resolver should be
>built at the factory so there is no need for diddling.
Maybe, maybe not. I have wound coils before, and it would be a learning
experience.
>> Then the question is, can emc2 interface, via a separate parport, the
>> rather copious amount of data this thing can produce on demand, and make
>> use of it at usable spindle speeds? That would appear to be easier on the
>> software than trying to use the quadrature signals since their rep rate
>> can get well into the megahertz range, pushing the interrupts right over
>> the edge.
>
>Yes, you skip the absolute output and just use the A and B
>outputs that look just line an encoder. Don't try to interface
>something like this in software. Use a hardware encoder
>counter. You'd never use the quadrature signal to cause interrupts.
Another accessory board? Whose would you suggest? And which .ini file?
--
Cheers, Gene
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
I stayed up all night playing poker with tarot cards. I got a full
house and four people died.
-- Steven Wright
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