Stop and resume - spindle operations

Hello to all,

In a lathe that is totally covered, we have a operator door from witch the operator loads the parts and can open the door for checking (measure) the part currently being done. We need to ensure the operator safety but at the same time allow flexibility on the machine operation.

What would be the best method to implement the following:

1)
When the machine is in automatic mode (running/cutting) and the operator opens the door, linuxcnc acts like feedhold (this should be easy enough) AND stops the spindle at the same time (this we do not know how to do).

2)
When the operator closes the door, the machine waits until something is pressed (resume feedhold is the best candidate) AND the spindle gains the desired (previous) velocity.

3)
When the door it open, even if the operator presses the spindle on or issues a MDI command for the spindle, the spindle will not rotate as the door is open.

Any idea? Is already something implemented? Someone is doing anything like we pretend?

By the way, for those that are following my questions, we currently have a machine working/producing parts, totally implemented with linuxcnc!

Thank you

I brought the topic of multiple instances of feedhold up in another thread. It seems the best way to do this is to access the mnl feedhold command directly, which as of now I have not figured out how to do. You can use the lut5 component as Andy suggested or you can write a short component using halui.feedhold and halui.resume. Each instance of feed hold would have its own in pin connected to halui.feedhold and conneceted to the condition that invokes it. Likewise you also will have just as many resume pins connected to halui.resume and connected to the condition that releases feedhold. I can give you an example if you would like. I have been thinking on this for a while.

Although I did not implemented it, my colleague already did it.
I am almost sure that we only used simple hal commands and no component was needed.
We are indeed using the feedhold, spindle stop and also a hard wire to the spindle VFD for extra safety on the stop.
When the operator closes the door, program automatically restarts, what was our intention, as we normally open the door to clean the work piece.
It is, as far as I know, implemented, so if you (JR1050) want the relevant part of our hal file, just let me know, although we only use one condition for the feedhold, that is the door switch.

Thanks for offering to.share, I wrote a multi input feed hold section into a component for my operator panels, as I have a feedhold button, a door switch, an orient routine, gear change and tool change that required feed hold at multiple instances along with error messages, that may or may not require feedhold or estop. I was just throwing out other possibilities!!

JR1050, I would love to see your example. I will be implementing this in the future on a machine. The thing that worries me is I remember reading about a bug. Basically if you stopped the spindle in CSS mode it would not restart correctly.

Found some info on the bug...

linuxcnc.org/hardy/lucid/index.php/itali...rpm-cap?limitstart=0

If using linuxcnc 2.6 there are two pins:

motion.spindle-inhibit
motion.feed-inhibit

that may be helpful to you.

Chris M

And in 2.6 it is possible to start and stop the spindle at any time, through an MDI command or just changing the hal pin state,
So you can also use and and component, spindle signal and door singnal to and and ouit to spindle...


Norbert