Re: Analog Spindle

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

Sorry to be the cynic but:
So where is the code...I only find basically a stub in cannon_stand-alone.cc
But nothing really implemented. I hope it is there someplace.

Dave

On 9/3/02 7:26 PM, "Jon Elson" <elson-at-pico-systems.com> wrote:

> 
> Kurtis Martineau wrote:
> 
>> Dave, and anyone interested in the emc interpeter,
>> 
>> Please take a look a the following manual:
>> 
>> http://www.isd.cme.nist.gov/personnel/kramer/publications.html#RS274NGC3
>> 
>> Unless I am mistaken, it would appear that the emc interpeter is more
>> complete than we using it.
>> The S**** command for speed is ready to be used (I think) - just how can I
>> direct it?
> 
> Yes, absolutely, the interpreter handles the S word, and sends an NML message
> through to some level inside EMC.  And, some code has been written to pass
> that along  to the STG-I card.  I don't know if it works now.  I suspect it
> DID
> 
> work at some time.  I will take a look at it in the BDI version I am working
> with
> right now, and see if I can get it to work with my new parallel port hardware.
> 
>> 
>> The other functions that I am interested in are also there.  Like clamping
>> outputs at the end of motion to hold position when using brakes on larger
>> machines.  The controller I took off clamped the X and Z axes after a
>> configurable time delay, which kept the motors alot cooler when motion is
>> not required.  I currently have the brakes wired through the software estop
>> and use a seperate 120v e-stop cct (mushroom button, overtravel limit
>> swtches, amp faults, etc) to disable the 3 phase power to the motion
>> contactors.
>> 
>> How can I configure the time delay before an axis is clamped and how can I
>> direct it to a STGII output? Once I have a bit that will toggle to the
>> outside world I can do the rest - It's the inside between the interpeter and
>> the STGII card where I have a hard time.
> 
> Well, you are really going to have to write C code to do this, as EMC is not
> going
> to know anything about this.  Very few modern machines use this kind of
> clamping.
> It was common with one-axis CNC back in the 1960s, when a single axis drive
> was switched among several axes.
> 
> It should not be necessary with modern motors and servo amps.
> 
> Jon
> 
>