I am currently building a Emergency Stop / Router Control Box for my SO3. I will use a solid state relay (SSR) to switch the router on and off and have included an emergency stop switch where the normally-open portion connects E-STOP to GND if pressed. If I do an emergency stop that way, will GRBL also set SPINDLE PWM to 0 in such a situation or do I need to add the normally-closed switch of the emergency stop switch between SPINDLE PWM and the SSD?
As others have recommended, the E-Stop should cut power to the Shapeoko and Spindle/Router in cause of an emergency. the E-Stop/Feed Hold pin depends on software and hardware cycles/interrupts, it may not immediately react and stop motion or the spindle.
There has been discussion on having the hard E-Stop (cutting power) along with a soft stop (Feed Hold) in those causes of not so dire emergency, if thats what you were aiming for. In which case I wouldn’t be able to answer how the PWM pin behaves, but someone will I’m sure momentarily
Just cutting PWM isn’t great. If you can use the M5 command some how you can decelerate the spindle really really quickly
I don’t think I have any way to interact with GRBL to inject a M5 G-Code command when the E-STOP button is pressed. That would have to be a function in GRBL itself I gues and I don’t want to mess with the firmware.
If I want to stop the router, I see only the options to cut the power to the router (which is not regulated by the PWM signal but just uses it to switch on/off - see S3 Spindle Control, final redux) on the mains side or on the trigger signal side of the SSR or hope for the firmware to stop PWM when E-STOP is engaged.
Ah if you just have a router you won’t get braking.
Your best bet is hook everything up to a bank of high power SSR relays keeping them on a single switch - thats what I have. One flick and everything killed.
Would you mind showing how you hooked/wired yours up? I am new to this however before I get cranking on my new XXL, I am building a full enclosure and wish to mount the control box externally and add an E-Stop switch killing everything. Please correct me if I’m wrong but you are referring to the IOT Power relay correct and hooking up the E-Stop switch to that? It would kill power to the Router and controller. It seems the easiest to assembly. It avoids having to install pins/ soldering or press fit connectors. Ideally I would love to be able to pause the motors and cut power to the router if I need to move a clamp or something then resume the work without having to reset the value. Is this possible?
Btw, looking forward to receiving my Beaver CNC Probe shortly. I plan on upgrading to the HDZ as well.
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