Hypersensing with THCAD - better way to do ohmic sensing

Yes, Linuxcnc is far more powerful than many people give it credit for.

I thought you asked about two topics.
1, How to disable the THC when the velocity slowed leading up to a corner ( I covered that)
2. What happens when cutting small holes. I did not speak much about that except to mention that Linuxcnc can filter the Gcode.


By filter I mean that Linuxcnc can automatically pass every gcode file it opens to a program that can modify the code before it is run.

But yes, Linuxcnc supports adaptive feed control which is enabled and disabled with M52. What this means is that an override (from 0% to 100%) can be applied to the cutting speed from a value outside of gcode. Its up to you how you use that feature.

Plasmac can use this for hole cutting. Lets look at an example. I often hear that you should reduce cutting speed by 60% on holes < 32mm diameter. So a gcode filter could inspect gcode arcs and holes and alter the cut speed if the radius is < 32mm by altering the gcode before it is executed.

Another more interesting way which I am experimenting with is to modify the core code of Linuxcnc so that it publishes the arc radius to the motion controller. We could then apply adaptive feed control to reduce the cut velocity based on any algorithm we care to create. This technique could even be extended to offset the torch path to allow for the wider kerf caused by velocity slowdowns.

And yes, these advanced features of linuxcnc are not widely appreciated and will give Linuxcnc a massive advantage over other solutions when it is used as a plasma controller.

To understand the logic of the speed of small holes just imagine - cutting a shape with angles will be passed by about 30% at a lower average speed.Therefore, it is necessary to reduce the speed of small holes - the cyclone torch begins to deviate from verticality and a bevel is obtained from above.

stivemaster13 wrote: To understand the logic of the speed of small holes just imagine - cutting a shape with angles will be passed by about 30% at a lower average speed.Therefore, it is necessary to reduce the speed of small holes - the cyclone torch begins to deviate from verticality and a bevel is obtained from above.

A few ways to handle these sorts of things. SheetCAM allows users to program cut rules that can slow the velocity down given certain angles, circle diameters, etc.

Also, PlasmaC can do hole cutting automatically: linuxcnc.org/docs/devel/html/plasma/plas...de.html#hole-cutting

So some of the functionality you speak of exists natively to PlasmaC. Other stuff can be handled via cut rules in CAM.

Have you read the PlasmaC user guide? There's a lot of good stuff in there.

See the level I've reached today gives me the opportunity to appreciate things I didn't appreciate years ago. So I think the capabilities of LinuxCNC can make up for Sheetcam's shortcomings.
The point is to start a more lively development and to suppress the feeling of self-satisfaction and superiority of what has been achieved. You still have a lot of work to do.

stivemaster13 wrote: See the level I've reached today gives me the opportunity to appreciate things I didn't appreciate years ago. So I think the capabilities of LinuxCNC can make up for Sheetcam's shortcomings.
The point is to start a more lively development and to suppress the feeling of self-satisfaction and superiority of what has been achieved. You still have a lot of work to do.

Please read that again, tomorrow, not today, and let us know the error of that statement.
And not it is not due to translation, if any.

What do you mean - the speed of the small holes? Well, it may be well described and I haven't been able to make sense of it yet. I only read it once.