It depends what you use and if you use the WDT.Įxample for TORCH-ON it have to fire automatically the WDT with 2Sec
#Sheetcam changing cut rate software#
Ohmic sensor and software correction or using higher sensing voltage. Thinner material require either previously Need integrate 2500 samples (50khz) or with 60hz 3000 samples. That is no problem, but it means that as example Voltage is preferable to lower voltage as having 150V and 2V noise isĢ.94V and 2V noise. That is uneven cutting faster as the control loop.īasically there is 2V 50/60Hz noise overimpressed and this is the Material height checking for setting correct starting height and when THC is simple, what is needed on THC side:Īnd if not plasma is not on Z is passed directly, and during runĭuring plasma run, normally Z axis is not driven, it is only driven Is there a way to make grbl essentially wait for that Arc OK signal before continuing? But I mention that to illustrate what I am trying to accomplish. I'm pretty new to this, so I tried putting a "!" on the line immediately following the M03 command, and I'm sure you know that this threw an error for an unsupported g-code command. I was hoping there was a way to put a command in the post processor that would put grbl into a hold state.
#Sheetcam changing cut rate how to#
So my problem: The "arc OK" feedback could be sent to grbl as a resume command, but I can't figure out how to hold it in the first place. My Hypertherm plasma machine can also send an Arc OK when it detects that the arc has pierced the metal. It then waits a predetermined amount of time (~0.5s) and sends an "Arc OK" signal back to the CNC controller, telling it to begin X and Y movement. It uses that as a trigger to do a probe first, and then it sends the signal to the relay to start the plasma.
![sheetcam changing cut rate sheetcam changing cut rate](https://image.slidesharecdn.com/huongdansheetcam-150729074956-lva1-app6892/95/ti-liu-s-dng-my-ct-plasma-ct-laser-sheetcam-26-638.jpg)
The THC takes the SpinEn output, which triggers the plasma arc relay when no THC is used, and intercepts it. I really need to get the machine working and use it. Anyway, I'm at the point now where I'm ready to just bite the bullet and buy an integrated unit like a Proma THC. I've tried for a couple months between designing, building, and troubleshooting. I've shielded and grounded everything and the grbl controller is fine. The plasma arc puts out a lot of EMI, and I just can't keep the THC uno from crashing and rebooting in the middle of a cut.
![sheetcam changing cut rate sheetcam changing cut rate](https://cdn.images.express.co.uk/img/dynamic/24/590x/secondary/car-tax-fuel-duty-rates-cost-charge-3764136.jpg)
I programmed a second arduino uno to act as the torch height controller (THC) and it works until the plasma power source is turned on. It works well on my 4x4 foot cnc plasma table, but I am having a hard time getting a torch height controller to work. I am running 0.9j with a v3.51 grbl shield.