On Saturday 20 March 2010, Paul Keeton wrote:
>Gene,
>
> Do you (or anyone else) see any any issue with using a separate
>encoder and leaving the tach on the motor alone? I have seen this done on
>other servo systems with great reliability. Normally backlash is not an
>issue unless it is an excessive amount on those systems. You simply don't
>use backlash comp if there is a scale on the machine. You may have to if
>your encoder is on the screw. Almost definitely if your encoder is on the
>motor and you have a gear box. I would have to agree about the lag time.
>What would you suggest? And by the way, I sensed no disrespect, I asked a
>question and you respectfully responded with an intelligent answer, and I
>thank you for that.
>
>Dave
I believe there are several here who are using the tach signal back to the
motors controller, and the encoder output then going back to emc, and it
apparently works quite well. But I should let those who are do the
testifying that it works well.
I can't personally testify to that as my only machine is a thoroughly hacked,
all new Z axis saig x1, with 262 or 425 oz steppers on it, aka the smallest
HF they sell, with bigger tables and the rebuilt z, it does pretty well if I
can keep the damned typos under control.
It missed the first 0 after the decimal point yesterday and carved a hole in
the side of the barrel channel of a gunstock I first carved by hand 40 some
years ago. So now I have some thin strips of walnut being glued up to make a
plug for it after I squared up the hole, the original blank was about $130 in
1969. With a little luck, it won't be too noticeable once its fully
refinished. That is basically what I was doing anyway as I'd pulled the Rem
788 action and its 2nd shot out Shilen 22-250 Barrel and have refitted it for
a heavy SS Howa 1500 in 22-250.
[...]
--
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)
"The identical is equal to itself, since it is different."
-- Franco Spisani
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