Re: Analog Spindle

["Patrick Riedlinger" <patr-at-precidesign.com>]

Hello Kurt:

I am interested in this also. I have been looking at a DAC that creates a
PWM output from digital signals. It can be incremented via a digital pulse
or can be up/down speed controled with push-button switches. I was going to
play with this eventually by sending the PWM signals to a Triac to control
the spindle speed by wave-clipping the ac voltage (very sucessful way to
control ac loads)

It sounds like you understand the output of the EMC better than I do.

Wanna collaborate?  :)

Pat Riedlinger

patr-at-precidesign.com


----- Original Message -----
From: "Kurtis Martineau" <klmartineau-at-shaw.ca>
To: "Multiple recipients of list" <emc-at-nist.gov>
Sent: Tuesday, September 03, 2002 10:02 AM
Subject: RE: Analog Spindle


>
> Ray,
>
> I am talking about a cnc application with servos for X Y Z, and analog
> spindle control ( from the g-code interpeter).
> The direction enable bits on the parport are what I see.  I want to see +-
> 10 vdc out of my stgII card.  I want to run the dac3 open loop, but there
> really should be an analog input for the current (load)  displayed 0-100%
up
> on the GUI for the operator and even maybe logging purposes.
>
> It appears that this is being done, or has been done by FMS (?), but in
> minimilltask.  At least some code that makes reference is there - but it
> almost looks like a simulation or something...I wish I knew more about C.
I
> am sure that for those who do, the code makes sense.
>
> Kurtis
>
>
> > Kurtis
> >
> > My memory fades but it seems to me that someone said that spindle speed
> > was available with stg on the next axis after whatever you'd defined in
> > your ini.  I haven't a clue how you'd tell it how many pulses per
> > rotation or max speed.
> >
> > Sounds like you are looking at a parport.  How are you planning to get
> > speed signal into the PC and the analog signal out?
> >
> > I am running my stepper based griz spindle with m3, m4 and m5 but I
don't
> > try to control speed from the PC.
> >
> > Ray
> >
> >
> > On Tuesday 03 September 2002 09:45 am, you wrote:
> > > A look through ../emctask/minimilltaskintf.cc  will reveal that some
> > > code has been written to allow a dac to be configured to run an analog
> > > spindle.
> > >
> > > SPINDLE_ON_INDEX  for which dac. (ie. 3 for the fourth)
> > > VOLTS_PER_RPM for obviously how many volts to output for every
> > > commanded rpm.(ie. 0.001 for 1volt per 1000 rpm)
> > >
> > > I don't get any analog ouput from:
> > > M3 S1000
> > > I do get the clockwise direction bit to toggle.  (M5 to stop, M4 for
> > > counterclockwise)
> > >
> > > What do I need to do in order to get the analog spindle output?
> > > Could this be brought over to work with bridgeporttask?
> > >
> > > Maybe a new name for the bridgeport stuff if any modifications are to
> > > be done;  something machine independant.
> > >
> > > Kurtis
> >
>
>
>