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4th axis question

sedwardsC74QH
Participant

4th axis question

sedwardsC74QH
Participant
Participant

Hi all,

 

I'm attempting to manufacture a small scale car body as part of a school competition.  Below is an image of my setup and the issue I'm having with a rotary toolpath.

 

Setup - The rotary axis is off-center.  This is dictated by the competition organizers, who supply the blank...

 

f1setup.JPG

The issue - Where the model nose cone converges at the end, the tool enters and crosses over the model surfaces, creating crashes and left over material.  In an attempt to fix the issue,  I have performed several operations to remove excess material (Facing, adaptives, Leaving stock on the rotary passes and working my way down) but this happens every time...

 

I've also tried changing the tool offsets, without luck.

 

f1rotary.JPG

Thank you in advance,

Si. 

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Joshua.Aigen
Autodesk
Autodesk

Hi @sedwardsC74QHCould you share your file, or a sample file that reflects your selections and settings?
File > Export > Save to local folder, return to thread and attach the .f3d file in your reply.


Joshua Aigen
Workshop Supervisor
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sedwardsC74QH
Participant
Participant

Thank you @Joshua.Aigen 

 

File attached.  It's a bit of a mess but I think you'll see the problem, especially in the final rotary operation.

 

Thanks,

Si. 

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Joshua.Aigen
Autodesk
Autodesk

Have you tried working with tool orientation? With a rotary and tool orientation turned on you should be able to do some 3+1 milling and add some more rough passes to the part. Then finish with a single rotary, I did notice that this does add some time to the operations, but if you can use a larger tool or customize the settings a bit like change from helix to plunge you should be able to cut the time a bit. I've included my file, it's not done but it should give you an idea of what I've done. You are very much on the right track, I think this approach will get you to a much better spot than multiple rotary passes.

Forum.JPG


Joshua Aigen
Workshop Supervisor
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sedwardsC74QH
Participant
Participant

Thank you @Joshua.Aigen 

 

This looks great. Thank you.  Just a couple of questions...

 

1 - Do I need to manually rotate the part with a different tool orientation or does this index the rotary axis?

2 - I noticed after the clearing operations, the end of the rotary operation still does that strange thing where it sends the tool deep into the part, instead of keeping the tip perpendicular to the part.  Any ideas? See below.

 

sedwardsC74QH_0-1649085294523.png

 

Thank you

Simon 

 

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Joshua.Aigen
Autodesk
Autodesk

Hi Simon, I would test the post, the indexing should happen on it's own I would just confirm on the individual machine.  As for the plunge I think it has to do with the geometry of the rectangular end if you use avoid surfaces and select all of the faces at that end I'm sure that can be avoided, or pull that area out of the rotary stock.Forum.JPG


Joshua Aigen
Workshop Supervisor
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sedwardsC74QH
Participant
Participant

Hi @Joshua.Aigen 

 

I'm struggling to get the nice clean rotary tool path you show on your image above.  I've chosen the surfaces at the front to avoid but it's still showing the yellow toolpaths that machine across the surface of the part? See image below.

 

Could you send the file above with the clean toolpath for me to take a look at?

 

Thank you,

Si

 

Capture.JPG

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sedwardsC74QH
Participant
Participant

@Joshua.Aigen Here's a better image to illustrate my issue...

 

Capture.JPG

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Joshua.Aigen
Autodesk
Autodesk

Hi @sedwardsC74QH, Unfortunately I closed Fusion so I don't have exactly what I made before. This was a challenge, I think is mostly has to do with the tool passing below the axis and the slight convex shape of the top surface. I've been working this morning to try to get back to what I had yesterday and I too am having a tough time eliminating those leads. If I can get it I will be sure to post it up.

 

EDIT: Looking back at the picture I posted. I think I moved the axis of rotation and that is why the toolpath is better. I'm Sorry this happened.


Joshua Aigen
Workshop Supervisor
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sedwardsC74QH
Participant
Participant

thank you so much @Joshua.Aigen 

 

It looks pretty smooth on your picture a few posts before this one.  Let me know if you can get back to that situation?  

 

I did think about machining the top using a parallel then rotating it 180 and doing the same for the bottom, but I'd really like to machine the car using a true 4th axis rotary path if possible?! 

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