Bore Face gouging - Turning

[jimmyUU9ZC]

Hi All,

Having a few issues with using a finish profile to offset bore a part I am making.

I U drilled the part to within 0.2mm of finish depth and I used to ( in Featurecam) rough bored the part with 0.4mm stock in z so as not to damage the boring bar against the pre drilled face.

All good so far, when I generate a finish profile path and have 4 step overs of 0.1mm in Z, the boring bar starts to get to X0 and rolls around the theoretical zero point and into the job, leaving quite a gouge and pinging the insert.

What have I done wrong guru's? Is this a no go with profile finishing in bores? 

Couple of screen shots below, bottom one shows the toolpath entering the job face.

[ChristopherMarion]

@jimmyUU9ZC 

Can you share your file so we can take a look?

Thanks,

[jimmyUU9ZC]

Sure thing, I have attached it. Thanks - J

[ChristopherMarion]

Hi @jimmyUU9ZC 

I cannot claim to be a Fusion 360 guru, but I have loads of experience with both FeatureCAM and PowerMill.  I am doing my best to learn this beast of a software.

In FeatureCAM, we would draw the curve and we can extend the turning pass by extending the curve.  Fusion does not require this, but the fine-tuning of how we want the toolpath to follow is definitely absent.  Keep in mind that the turning portion of Fusion is being heavily developed by the Autodesk team using the Delcam technology.  I can only imagine that both the turning and milling are going to grow leaps and bounds in coming releases.

With that being said, I have never had great luck with using the "Profile" turning.  I seem to get this weird behavior like you are experiencing.  I tend to gravitate to either Profile Roughing or Profile Finishing.

In the Profile path you provided, I was able to remove the dipping towards the center of your part by placing an offset of 0.4mm (the tipped radius of your insert).  This may leave a nipple in the center of the part, but it is better than gouging.

Personally, I would use the strategy that you used for the final pass instead, but place multiple cuts.

Lastly, you are probably going to get gouges with the tool against the model.  You will need to adjust the tool holder to avoid this.

Hope this helps.