Re: Analog Spindle

[Dave Engvall <dengvall-at-charter.net>]

Hi all,
Not that I did an exactly exhaustive search but the only stuff I find on
spindle is in the G8x code for tapping and back-boring.

It would seem that we really need, at a minimum, something that interprets
SXXXX based on a max value in .ini and scales the analog output to the
spindle servo. Now to close the loop we need emc to understand an index
pulse and rotary motion.
We can always run open loop with just the tach for control except if we want
to thread or do other fancy things.
The lathe people need some of the same stuff except for different axis
names. I think forward, reverse and brake are already output pins so that is
taken care of. 
There should be a way to fake some of this with an additional axis except
that one will immediately get following errors.

BTW-this is one of the functions I need badly for the Mazak. :-)

HTH 

Dave


On 9/3/02 10:04 AM, "Kurtis Martineau" <klmartineau-at-shaw.ca> wrote:

> 
> 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
>> 
> 
> 
>