Hello.
How can i rotate the working plane in KmotionCNC. I know there is a gcode "G68 X0Y0 R45" that rotates the xy plane 45 degrees for example, but the code is rejected by the KmotionCNC. Is there an alternative method?
Regards.

G68 isn't currently supported.  Coordinate transformations may be performed with Geometric Correction.
http://www.dynomotion.com/Help/KMotionCNC/GeoCorrection.htm

Regards
TK

 

Hello.
How can i rotate the working plane in KmotionCNC. I know there is a gcode "G68 X0Y0 R45" that rotates the xy plane 45 degrees for example, but the code is rejected by the KmotionCNC. Is there an alternative method?
Regards.

Thank you for the quick reply.
I don't understand the example. Can you give me another example how to implement this and how can i , for example rotate the plane by 12.3 degrees;

Well after some reading, i don't see any easy way to implement what i need, at least for my knowledge.
I guess the only way is to switch to Mach3 HMI, which has this future.
Any way is there a time frame of when the G68 is going to be implemented?
Regards.

I'm not sure.  You are only the 2nd person to inquire about it.  What do you need it for and what would you be willing to pay for it?

It looks like Haas charges $1395 per machine for it :)
http://parts.haascnc.com/haasparts/en/USD/Performance-Upgrade/Control-Options/Mill-Control-Options/COORDINATE-ROTATION-AND-SCALING-OPTION/p/ROTATION%20AND%20SCALE

Can't your CAD system do it for you?

I was thinking it could be applied in the kinematics layer like the GeoCorrection, but then I realized the DRO and BackPlotter would not show the rotation.  I would assume you would want the unrotated coordinates in the DRO but rotated coordinates in the plot.  Can you explain in detail how you would expect it to work?



BTW the MeasureFiducials C# example has some code to create a Geocorrection file given: theta rotation, scale, and xy offset.  See the code, Article, and Video below.

Regards
TK


        private void WriteGeo()
        {
            string mapfile = MainPath + "\\KMotion\\Data\\FiducialsMap.txt";
            System.IO.StreamWriter file = new System.IO.StreamWriter(mapfile);
            file.WriteLine("2,2");        // rows, cols
            file.WriteLine("1,1");        // gridx gridy
            file.WriteLine("-0.5,-0.5");  // centerX Centery

            WriteGrid(0, 0, ref file);
            WriteGrid(0, 1, ref file);
            WriteGrid(1, 0, ref file);
            WriteGrid(1, 1, ref file);

            file.Close();

            MapFile.Text = String.Format("{0} Created", mapfile);

            Host.SendMessageService(HostComm.ID_ReloadGeoCorrection);

            Theta.Text = (theta * 180.0 / Math.PI).ToString("F4");
            ScaleFactor.Text = scale.ToString("F4");
            XOff.Text = ConvertToUser(offsetx).ToString(UnitsFormat);
            YOff.Text = ConvertToUser(offsety).ToString(UnitsFormat);
        }

        private void WriteGrid(int row, int col, ref System.IO.StreamWriter f)
        {
            double Centerx = 0.5;
            double Centery = 0.5;
            double x = col - Centerx;
            double y = row - Centery;
            f.WriteLine(String.Format("{0},{1},{2:n6},{3:n6},0", row, col, TransformX(x, y), TransformY(x, y)));
        }

        private double TransformX(double x, double y)
        {
            return (scale * (x * Math.Cos(theta) - y * Math.Sin(theta))) + offsetx;
        }

        private double TransformY(double x, double y)
        {
            return (scale * (x * Math.Sin(theta) + y * Math.Cos(theta))) + offsety;
        }

https://dynomotion.com/Help/KMotionCNC/FiducialAlignment.htm

https://youtu.be/a_p38zktIZI

 

Well after some reading, i don't see any easy way to implement what i need, at least for my knowledge.
I guess the only way is to switch to Mach3 HMI, which has this future.
Any way is there a time frame of when the G68 is going to be implemented?
Regards.

Attachments :

It's for a oxyfuel cutting flatbed pantograph. The customer needs to align the part to the plate, which plate is a very heave/thick and is leaved by a crane in a not a parallel position to the machine axis. The best method to align the machine to the plate, is by registering one corner of the plate and then moving the machine to the other corner and registering again the second corner. The controller then can calculate the plates angle.The plate is rectangular.
Attached is a drawing explaining the situation.
I changed to the Mach3 HMI, which has this future build in, and i fixed the problem. The question was just to know if your planing to implement this in the future or not.

Attachments :

Attachments :

Yes this is what i want to do. I try to attach a picture but it seems it does not work. The idea is to make a button on the KmotionCNC, in which the user can input the rotation angle.

Attachments :

Attached (and pasted below) is a KFLOP C Program that prompts the Operator for an Angle, creates a GeoCorrection File - C:\Temp\MapFile.txt, and reloads it.  KMotionCNC must be configured to use that file.

Regards
TK

#include "KMotionDef.h"
#define TMP 10 // which spare persist to use to transfer data
#include "KflopToKMotionCNCFunctions.c"

// Create KMotionCNC GeoCorrection File based on simple Transformation

double offsetx = 0.0;  // Transform values
double offsety = 0.0;
double theta = 0.0;
double scale = 1.0;

void WriteGrid(int row, int col, FILE *f);
double TransformX(double x, double y);
double TransformY(double x, double y);

main()
{
    float value;
   
    // Ask Operator desired rotation angle
    if (!InputBox("Enter Angle in degrees",&value)) 
    {
        theta = value * PI/180.0;  // convert to radians
       
        // Create Simple 4 point Geo File
        FILE *f=fopen("C:\\Temp\\MapFile.txt","wt");
        fprintf(f,"2,2\n");        // rows, cols
        fprintf(f,"1,1\n");        // gridx gridy
        fprintf(f,"-0.5,-0.5\n");  // centerX centerY

        WriteGrid(0, 0, f);  // write the 4 transformed points
        WriteGrid(0, 1, f);
        WriteGrid(1, 0, f);
        WriteGrid(1, 1, f);
        fclose(f);
        DoPC(PC_COMM_RELOAD_GEOCORRECTION);  // tell KMotionCNC to reload the file
    }
}

// write a transformed point to Geo File
void WriteGrid(int row, int col, FILE *f)
{
    double Centerx = 0.5;
    double Centery = 0.5;
    double x = col - Centerx;
    double y = row - Centery;
    fprintf(f,"%d,%d,%.11f,%.11f,0\n", row, col, TransformX(x, y), TransformY(x, y));
}

// Desired X Transformaion
double TransformX(double x, double y)
{
    return (scale * (x * cos(theta) - y * sin(theta))) + offsetx;
}

// Desired Y Transformaion
double TransformY(double x, double y)
{
    return (scale * (x * sin(theta) + y * cos(theta))) + offsety;
}

 

From what I'm aware, the geometric transformation is done in KMotionCNC, not in the KFlop, which means any correction has to be done on the computer.

For somebody with the relevant skills, it shouldn't be too hard to create a small program to generate the required transformation file.

And your photo has sent fine. I've now seen multiple copies!

Moray

On Wed, Jan 24, 2018 at 9:26 PM, g..astras@... [DynoMotion] <DynoMotion@yahoogroups.com> wrote:

 

Yes this is what i want to do. I try to attach a picture but it seems it does not work. The idea is to make a button on the KmotionCNC, in which the user can input the rotation angle.