topic Re: Error in end point of circle Siemens 840D in HSM Post Processor Forum

Error in end point of circle Siemens 840D

Anonymous — Fri, 24 Jul 2020 07:47:48 GMT

Can anyone finally fix this error. It's caused by smoothing, and it's happening because there is no vectorized check of position after smooth made its work. But machine doesn't "like" those small differences.

Please can anyone help. I'm tired of splitting processes and looking for a way to get the machine to work.

Re: Error in end point of circle Siemens 840D

bob.schultz — Thu, 30 Jul 2020 13:02:12 GMT

It sounds like your control does not like the round-off error on the final point of the circle. If this is the case, you can add code to make this final point lie exactly on the circle. We do this in some of our posts for finicky controllers, for example the Prototrak post processor.

To implement this logic in your post, copy the entire CircularData function into the post and make all changes that reference circle in the onCircular function.

// COPY THIS ENTIRE FUNCTION TO YOUR POST FROM THE PROTOTRAK POST /** Adjust final point to lie exactly on circle. */ function CircularData(_plane, _center, _end) { ... } // MAKE ALL CHANGES RELATED TO THE 'circle' VARIABLE function onCircular (clockwise, cx, cy, cz, x, y, z, feed) { ... var circle = new CircularData(getCircularPlane(), new Vector(cx, cy, cz), new Vector(x, y, z)); ... switch (getCircularPlane()) { case PLANE_XY: writeBlock( gAbsIncModal.format(90), gPlaneModal.format(17), gMotionModal.format(clockwise ? 2 : 3), xOutput.format(circle.end.x), yOutput.format(circle.end.y), zOutput.format(circle.end.z), iOutput.format(circle.offset.x, 0), jOutput.format(circle.offset.y, 0), feedOutput.format(feed) ); break;

Re: Error in end point of circle Siemens 840D

Anonymous — Thu, 30 Jul 2020 13:27:10 GMT

ok 🙂

but ... I'm pretty sure I'm using IJK onCircular mode, and also the infeed and outfeed arcs are used differenty - I think CIP is used when all IJK coordinates are used.

PS. And yes the error is visible when for example simple chamfering in circle is made - and coordinates are like 0,001 off - ie. X should be 2.5 and in code is 2.499

Re: Error in end point of circle Siemens 840D

bob.schultz — Thu, 30 Jul 2020 20:46:02 GMT

The CircularData function returns the circular data so that the values generate a circular record that is exact using the truncated values and will not be off by 1 unit. It can be used in any post just by calling it and replacing the values passed into onCircular with the CircularData (circle) values. Here are a list of the values that are returned, and the onCircular values they replace.

CircularData onCircular Variables start --> getCurrentPosition() (start) end --> x, y, z center --> cx, cy, cz offset --> center - start radius --> getCircularRadius()

Re: Error in end point of circle Siemens 840D

Anonymous — Wed, 05 Aug 2020 11:34:08 GMT

So finally got some time to play with it.

I'm getting post processor error: Error: TypeError: circle.end is undefined

Re: Error in end point of circle Siemens 840D

bob.schultz — Wed, 05 Aug 2020 12:47:02 GMT

Did you add this line to the onCircular function?

var circle = new CircularData(getCircularPlane(), new Vector(cx, cy, cz), new Vector(x, y, z));

Re: Error in end point of circle Siemens 840D

Anonymous — Wed, 05 Aug 2020 13:05:30 GMT

Yes I did

Re: Error in end point of circle Siemens 840D

bob.schultz — Wed, 05 Aug 2020 13:09:20 GMT

The CircularData function should have been copied from the Prototrak post. It is blank in your post. Here is a copy of the function that you can copy into your post.

/** Adjust final point to lie exactly on circle. */ function CircularData(_plane, _center, _end) { // use Output variables, since last point could have been adjusted if previous move was circular var start = new Vector(xOutput.getCurrent(), yOutput.getCurrent(), zOutput.getCurrent()); var saveStart = new Vector(start.x, start.y, start.z); var center = new Vector( xyzFormat.getResultingValue(_center.x), xyzFormat.getResultingValue(_center.y), xyzFormat.getResultingValue(_center.z) ); var end = new Vector(_end.x, _end.y, _end.z); switch (_plane) { case PLANE_XY: start.setZ(center.z); end.setZ(center.z); break; case PLANE_ZX: start.setY(center.y); end.setY(center.y); break; case PLANE_YZ: start.setX(center.x); end.setX(center.x); break; default: this.center = new Vector(_center.x, _center.y, _center.z); this.start = new Vector(start.x, start.y, start.z); this.end = new Vector(_end.x, _end.y, _end.z); this.offset = Vector.diff(center, start); this.radius = this.offset.length; break; } this.start = new Vector( xyzFormat.getResultingValue(start.x), xyzFormat.getResultingValue(start.y), xyzFormat.getResultingValue(start.z) ); var temp = Vector.diff(center, start); this.offset = new Vector( xyzFormat.getResultingValue(temp.x), xyzFormat.getResultingValue(temp.y), xyzFormat.getResultingValue(temp.z) ); this.center = Vector.sum(this.start, this.offset); this.radius = this.offset.length; temp = Vector.diff(end, center).normalized; this.end = new Vector( xyzFormat.getResultingValue(this.center.x + temp.x * this.radius), xyzFormat.getResultingValue(this.center.y + temp.y * this.radius), xyzFormat.getResultingValue(this.center.z + temp.z * this.radius) ); switch (_plane) { case PLANE_XY: this.start.setZ(saveStart.z); this.end.setZ(_end.z); this.offset.setZ(0); break; case PLANE_ZX: this.start.setY(saveStart.y); this.end.setY(_end.y); this.offset.setY(0); break; case PLANE_YZ: this.start.setX(saveStart.x); this.end.setX(_end.x); this.offset.setX(0); break; } }

Re: Error in end point of circle Siemens 840D

Anonymous — Wed, 05 Aug 2020 14:01:52 GMT

Oww sorry my bad.

Ok I copied all of it.

And it posted fine.

But on machine I got error.

And when I look at the code:

N20 G0 X59.25 Y-31
N21 G0 Z15
N22 M8
N23 G0 Z5
N24 G1 Z-13 F200
N25 G17
N26 G3 X58.25 Y-31 Z-14 I-1 J0 F2328
N27 G1 X57.25

It's like it tries to go circular on straight line. at this point in code it should lead-in.

Re: Error in end point of circle Siemens 840D

bob.schultz — Wed, 05 Aug 2020 16:21:04 GMT

Yes, this output is not correct since the end point calculates to be the same as the center point. I have tried the modifications here and cannot duplicate this issue. Can you provide the model that you are working with as an .f3d file. Thanks.

FYI, the circular block is actually a helical move, since the Z-axis moves in the same block.

Re: Error in end point of circle Siemens 840D

Anonymous — Thu, 06 Aug 2020 08:36:44 GMT

Attached

Re: Error in end point of circle Siemens 840D

bob.schultz — Thu, 06 Aug 2020 21:04:16 GMT

Thanks for providing the model, it makes things clearer. There are a couple of issues with your post concerning circular interpolation. First, you added the plane codes (G17, G19), but forgot to add the output of G18. The entry arc is in the G18 (ZX) plane, but the G18 code is not output in the circular block.

The second issue is that you output circular in all planes with the Ixxx and Jyyy center point coordinates. You need to output the correct coordinates based on the plane (G17 Ixxx Jyyy), (G18 Ixxx, Kzzz), (G19, Jyyy Kzzz).

Re: Error in end point of circle Siemens 840D

Anonymous — Fri, 07 Aug 2020 07:51:43 GMT

Thank YOU Bob so much

I think it works now.

Is there some test procedure that will prove correct working of posts?

And small question: Is there a way to make bore operations on cone surfaces to not linearize in code but make true helical moves - i guess with xyz and ijk at the same time?

Re: Error in end point of circle Siemens 840D

Anonymous — Fri, 07 Aug 2020 10:54:09 GMT

Unfortunately something sliped throu cracks.

I got error again. in attached part, on last 3d contour. On line N28

Re: Error in end point of circle Siemens 840D

bob.schultz — Fri, 07 Aug 2020 20:23:54 GMT

I checked the values here and they are exact. The circle in question has a circular sweep of 359.215 degrees, almost a full circle. It seems that your control does not like this for some reason, so you can limit the circular output to 90 degrees which hopefully resolves the last of your issues. You will find this variable towards the top of the post, make it look like this.

var useArcTurn = true; maximumCircularSweep = toRad(useArcTurn ? 90 : 90); // max revolutions

If this doesn't work, you can try to set useArcTurn to false, which will output circular records using the CR=radius format.

Re: Error in end point of circle Siemens 840D

bob.schultz — Fri, 07 Aug 2020 21:05:42 GMT

@Anonymous wrote:

Thank YOU Bob so much

I think it works now.

Is there some test procedure that will prove correct working of posts?

And small question: Is there a way to make bore operations on cone surfaces to not linearize in code but make true helical moves - i guess with xyz and ijk at the same time?

You can run the NC code through a back plot routine, such as NC Viewer to visualize it.

For helical interpolation on a cone, it is not possible since the radius of the arc changes as the tool path progresses down the cone. It is only valid for a cylinder.

Re: Error in end point of circle Siemens 840D

Anonymous — Mon, 10 Aug 2020 06:37:26 GMT

Hello Bob,

I got an error today on post

Error: Error: Invalid number of arguments.

that was on circular.

And also on 2d contour i couldn't make circular line in - now is changed to simple straight line in.

Re: Error in end point of circle Siemens 840D

bob.schultz — Mon, 10 Aug 2020 13:26:38 GMT

I don't get an error running your part on my version of the post. Can you supply the post you are using? The vertical lead-in is controlled by Fusion, if you make the following changes in the Linking tab of the 2-D profile, you will get a circular lead-in.

Re: Error in end point of circle Siemens 840D

Anonymous — Mon, 10 Aug 2020 13:33:21 GMT

It occurs on 2d adaptive

Re: Error in end point of circle Siemens 840D

bob.schultz — Mon, 10 Aug 2020 16:01:18 GMT

I don't get an error running with your part and post. Can you provide the log file created when you get the error?