Two steps forward and one step back.
Some serious words of warning
- The G31 probing code is not
This is not working at all, since it is not implemented. If you enter for example “G31 Z-10 F100” then the Z should start to travel towards -10 and stop on contact with the probe. Nothing happens, no axis will move on G31. I have been in touch with the maker of the card and they promised to solve it but that never happened. I think they lost interest in this card or realized that the second problem is killing the product anyway, so they have just dropped it all together. What is even worse is that they made their own probe function.
- The built in Z probe has serious
bugs in it
There is a built in Probe function but it is improperly implemented and is only working for the Z axis. In any case, the function is not usable because the axis will overshoot, in one of the possible modes down, right into the work piece, or if you plan to use the other mode then it moves extremely slowly down, stops when necessary and moves up but overshoots and sets the wrong offset. Totally useless.
- The most serious issue
An extremely serious issue which could cause fatal or serious injury to the user or destroy the machine is the extreme noise sensitivity of this card and the way it can behave in a noisy environment. I am talking about electrical noise, not something the user can do much about. Switching on a light in the room, or starting up a vacuum cleaner or another machine while the CNC is under power, or running, cause the CNC to run away totally uncontrolled. This is caused by the HyCNC USB card “spitting out” a huge number of step signals on any axis, or simply stops reacting to input signals. The results can be that the CNC movement stops on one or all axes or in some cases one or more axes starts using rapids, smashing the tool, the work piece or the CNC itself if you can’t manage to stop it and break the power. When the runaway occurs, the eStop is also out, so the only way to stop the movement is by breaking the mains power. Uncontrolled movements are rare but they have happened twice in real use, and a few times while I milled air.
Time to take a step back in development of my CNC
WARNING about the HyCNC USB card
My CNC is now ready
Will post pictures and will describe the final machine later on and in another post.