» Topic: 4th Axis rotary Tool-path puzzle.
- October 11, 2013 at 6:27 pm #15610
I am attempting to make a cabriolet leg on my router with a 4th axis. I have work most of it out but I notice that the tool retracts for a fast move in a couple of places, attached screen shot of final tool-path. I have tried different diameter tools, different machine tolerances and tool-path strategies but can’t get rid of these little “holes” in the tool-path. Does anyone have an idea of what might be causing this?
Attachments:You must be logged in to view attached files.October 12, 2013 at 4:03 am #15612
can you post the solid? Have you tried a 3d cut with a boundary just in those areas without Rotary to check the geom? That does look strange. are there holes one the outher side of the leg?October 12, 2013 at 4:30 pm #15614
Yes there is another hole on the other side. I tried a 3d equidistant cut in the area of one of the holes and see that the tool path goes under the skin in this area, I can see it if I turn off shading, guess there is something wrong with the model. I made the model from a wireframe and it is a bit rough but seems to work OK. I’ve attached the BCC file, v25, if you want to have a look.
CalumOctober 12, 2013 at 4:35 pm #15615
Yes there is another hole on the other side. I tried a 3d equidistant cut in the area of one of the holes and see that the tool path goes under the skin in this area, I can see it if I turn off shading, guess there is something wrong with the model. I made the model from a wire frame and it is a bit rough but seems to work OK. The BCC file and the STL are too big to attach, 6-7 Mb, I could send it directly to you if you want to have a look.
CalumOctober 12, 2013 at 6:37 pm #15616
Maybe you can zip the file and send so we can take a look if not let me know
RogerOctober 12, 2013 at 6:46 pm #15617
If your like everybody else and would like to solve your problems sometimes a little faster when you don’t get much of a response at this forum you might want to try CNCZONE/Bobcad forum. There is quiet a bit of Bobcad activity there.October 12, 2013 at 11:04 pm #15621
I didn’t think of zipping the file which I have now done. File attached.October 13, 2013 at 11:41 am #15623
Maybe what is happening is the same thing that Nick is describing is that tool path does not go below rotation axis
If everything is working with the tool path would it be possible to maybe index to those areas of problem and create a boundary and 3d cut those areas all I’m seeing is 2 areas and the appear to be at 180 deg. apart. Just a thought Maybe some one will come up with a solution to this problem. I see it is posted at the cnczone now.
Nice looking leg looks like it was a lot of work.
Attachments:You must be logged in to view attached files.October 13, 2013 at 12:00 pm #15628
Do you have 4-Axis Standard or Pro? I’m having an issue with cuts that should go below the rotational axis in Standard.
If you can use slightly larger stock and offset and angle the job so that all cuts are above the rotational axis you should get working tool paths, sadly I don’t have this option with my part,
NickOctober 13, 2013 at 12:11 pm #15629
I also wonder if the 4th axis Pro might have the fix
V26 Demo can be down loaded now and it has all the bells and whistles to try and even make code for I think for 5 days I only have 2 days left. Maybe if I get time I will mess with it in the Pro version.
RAFOctober 13, 2013 at 12:45 pm #15630
I only bought V25 this year and I’ve already used my cheque book to “fix” the problems in the simulator, the basic version of which doesn’t work correctly with 4-Axis.
I suspect Pro will work, nothing in the documentation refers to Standard’s inability to generate a path below the rotational axis though.
NickOctober 13, 2013 at 3:42 pm #15631
OK thanks for the help, that was the answer, I’ve rotated it and that fixed the issue. Yeah it did take a lot of work to build the model and now I’m making variations for other jobs.
I have 4 axis standard, I’m about to try v26 demo.
BTW how do you attach pictures to these posts?
CalumOctober 13, 2013 at 4:59 pm #15632
I use Snipping Tool
Start Menu/snipping tool/rectangle box/save as/jpeg/my pictures
Then to attach picture
Go to browse box below posting window —- Browse/ my picture /find pic /select
There are many ways to do it but I prefer this way.
RAFOctober 14, 2013 at 9:53 am #15633
OK thanks for the help, that was the answer, I’ve rotated it and that fixed the issue.
That’s excellent, good to hear you can get your part made,
NickOctober 14, 2013 at 3:48 pm #15637
I see this issue on CNCzone now, guess its only just come to peoples attention. I notice its still an issue in v26 so I guess we need to get BC developers interested in this.
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