Work with probe

Hi,

very nice tool!! Looks really great.
I have been using Z-probing for tool length compensation for a while. Using the probe for edge finding is very interesting to me, too, I will try it out.

I've seen in the screenshots that you are able to detect the angle of the workpiece, too? (I mean the angle along Z). Are you able to correct the angle, too? I guess no, right?

We all know, that it can be hard to properly align a workpiece on the machine (e.g. when working of the backside, or for many other purposes). Is there any possible way for semi-automated alignment of x and y AND PHI by doing a probe.

As far as I know linuxcnc uses the concept of joints and axis. So a trivial machine (with joints equal to axis) could use a rotation matrix with angle phi. Phi is 0 by default, but can be set by a probe.

Does anyone tried something like this already?

Could be even more interesting for engraving operations to probe the z-plane in a couple of points, fitting a surface and auto-correcting the plane in all three axis. And could be really really usefull when working with 4 or 5 axis.

Has someone experience with such things?

Thanks
Georg

schorsch wrote: I've seen in the screenshots that you are able to detect the angle of the workpiece, too? (I mean the angle along Z). Are you able to correct the angle, too? I guess no, right?

It should be trivial. G10 L2 allows you to rotate the coordinate system around the Z axis.

Ok,
I didn't know, It seems the documentation of G10 L2 is a bit "poor", only for my understanding:

G10 L2 R90

rotates the xy plane 90deg? I'm asking, because there is no unit mentioned in the doc. that means x becomes y and y becomes -x, right? And it works for any angle?

Lets assume a more complex example:
A 5axis machine, xy table, ontop is an a-axis ontop of the a-axis is a c-axis, spindle has fixed angle, but moves in z

I'm placing a workpiece in the stack, its surface is 10 deg rotated around Y-Axis (in mcs). Now I'm starting to probe the surface to align it properly (three points). From the gradient I'm detecting my highest slope (should be in the direction of the x-axis, because its tilted around y).

That means the corresponding alignment proceduce needs to turn the C-axis by 90 deg and the A-axis by 10 deg. that means that the x-axis in tcs is now the y-axis in wcs and vice versa. Please understand, this is a simple example, it needs to run for all kinds of surfaces

How can I do this with G10 L2??

Thanks
Georg

schorsch wrote: How can I do this with G10 L2??

I am pretty sure that G10 L2 Rnn only knows about X and Y.

On a non-trivial machine I think that the behaviour would need to be experimentally determined.

I think the units are degrees, as is usual in G-code. But again, testing will make it clear pretty quickly.

I have been using the probe functions for a long time now and I am very happy with it. It just occurred to me that there is one very nice feature missing. We can probe the inside and outside of a round item but one thing we cannot do is get the center of a rectangular piece of stock. At least not as far as I am aware. I saw the Path Pilot does it in one operation. Just wondering why it was never mentioned here. It would be a nice feature.

I tried it and I am missing the HAL command to hook it up ...

I tried to remove what was there since it was entering in conflict with the input hook up command

#net probe-in => motion.probe-input

and place a command to hook up the input

net probe hm2_5i25.0.7i77.0.0.input-31 => motion.probe-input

When I try it, I get "must be in MDI mode to issue MDI commands"

When I touch the probe, I hear the relay triggering but don't see anything on screen confirming contact ... I am missing something ?