average_jonny

Rotary 4-axis problem - not detecting collision geometry

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Just came across a strange issue, potentially a bug, when using the rotary 4-axis toolpath. I've recreated the issue using a simple cylinder and a block which isn't too dissimilar from the actual geometry.

So to put it simply - when the cylinder is selected as the surface cut pattern and the block is selected as the collision control and the cutting method is set to rotary cut the toolpath generates as expected and it avoids the block as seen in the attached capture.

Now if you set cutting method to axial cut with the cut pattern and collision control surfaces still the same the toolpath does not detect the collision geometry, as seen in the other attached capture.

Any ideas why this is happening? Running Mastercam 2019 BTW

 

1.JPG

2.JPG

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34 minutes ago, average_jonny said:

Any ideas why this is happening? Running Mastercam 2019 BTW

What post do you have linked? 

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1 hour ago, average_jonny said:

Just came across a strange issue, potentially a bug, when using the rotary 4-axis toolpath. I've recreated the issue using a simple cylinder and a block which isn't too dissimilar from the actual geometry.

So to put it simply - when the cylinder is selected as the surface cut pattern and the block is selected as the collision control and the cutting method is set to rotary cut the toolpath generates as expected and it avoids the block as seen in the attached capture.

Now if you set cutting method to axial cut with the cut pattern and collision control surfaces still the same the toolpath does not detect the collision geometry, as seen in the other attached capture.

Any ideas why this is happening? Running Mastercam 2019 BTW

 

1.JPG

2.JPG

Without a file to see exactly what your seeing no idea. I do suggest sending into QC(at)Mastercam(dot)com and seeing if they can see if it is a bug and if it is get a number assigned to it to get it addressed.

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Thanks for whittling this down to a simple case.  I created a similar part and duplicated the problem in X9 thru MC2020. I logged it as D-39692. If you backplot (and especially if you enable display of endpoints) you will see that the tool machines along the cylinder right up to the block but then keeps down thru the block. So I think this is a “retract” issue (tool not lifting when it should). 
I didn’t find any work-around yet. 
Thank you for letting us know about this.

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5 minutes ago, billb said:

Thanks for whittling this down to a simple case.  I created a similar part and duplicated the problem in X9 thru MC2020. I logged it as D-39692. If you backplot (and especially if you enable display of endpoints) you will see that the tool machines along the cylinder right up to the block but then keeps down thru the block. So I think this is a “retract” issue (tool not lifting when it should). 
I didn’t find any work-around yet. 
Thank you for letting us know about this.

Thank you for reading his topic and getting involved and logging it.

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13 hours ago, billb said:

Thanks for whittling this down to a simple case.  I created a similar part and duplicated the problem in X9 thru MC2020. I logged it as D-39692. If you backplot (and especially if you enable display of endpoints) you will see that the tool machines along the cylinder right up to the block but then keeps down thru the block. So I think this is a “retract” issue (tool not lifting when it should). 
I didn’t find any work-around yet. 
Thank you for letting us know about this.

Thanks for doing this Bill, look forward to seeing what comes next with it. Also just to add on, when the cut pattern is switched to axial why does it start at a 90 degree angle from the toolpaths plane? Normally I could get around this by telling it to start at -90 or +90 but the values are limited from 0 - 360.

In the mean time I've attached the file from the original post as well as the actual file in which I first encountered the issue (although I've deleted the rest of the toolpaths and just kept the rotary 4-axis one). You can see in this file and the attached capture that it does detect some geometry but as Bill said doesn't retract and gouges straight through collision check surfaces.

 

 

1.JPG

Rotary_issue.mcam

Rotary_issue_actual.mcam

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Thx for both parts. My part and your Rotary issue part both show the D-39692 problem with gap along one cut due to check geometry. I submitted a fix for that and hope it moves forward into an upcoming release. 

But my part had the Retract plane turned on. Your parts have it turned off and that shows another problem with the feed plane not getting applied. I logged this second issue as D-39371.

If you enable retract plane, then your Rotary issue actual path will lift the tool between cuts. You’ll have to increase the retract increment from .25 to .5 to clear the check geometry. Enabling retract plane on Rotary issue, though, doesn’t help in your release as you will bump into D-39682. 

I’ll see about the start angle. You should be able to start at 270 degrees to get the desired -90 degree effect.

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