Turning- Profiling Below X0.

[Dave_Moxham1]

Hello People,

Is it possible to get Fusion 360 to create a turning profile below the X0 centre?

I'd like to perform the roughing profile as seen above, then perform a similar operation below the centre, to create the undercut in the middle, using the same tool in reverse?

I've played around with a few different setups and tool orientations, but I can't get it to work.

Is this possible?

Thanks in advance,

Dave

[Richard.stubley]

Hi, could you attach the file for me to have a play with.

Turning under the X is uncommon so im not 100% if what your after is possible. at the very least we will have to reverse the spindle direction when you cross the centreline. 

[Dave_Moxham1]

Hi Richard,

Here you go. 

Thank you for taking a look.

[daniel.pacific]

At the moment, No. But turning on the negative diameter is something that we do have on our roadmap.

In theory you could hand modify the positive X coordinate for negative and reverse the spindle direction to achieve the same results. But, you would be assuming some risk since we wouldn't be verifying the toolpath for you in Fusion (which is the bulk of our work for the project) and it requires you to be comfortable with modifying NC code. 

[Dave_Moxham1]

Thanks for the reply Daniel.

On this job it's no issue for me to set up a duplicate tool facing the other way and machine from X+, but I do have some parts where I'm very limited on turret stations, so the added capability will be welcome, when it arrives.

[ChrisDPCnc]

Turning -X is fairly common....

Ecocut tools have built their whole existence around it

Programming Swiss machines we often face off the sub end with a boring bar due to lack off available tool stations.

Could the OP chain some 2D drawn in -X to get around their query? 

[Sq_14]

---

@daniel.pacific wrote:

At the moment, No. But turning on the negative diameter is something that we do have on our roadmap.

---

and two years later ... it's there ... but only for INSIDE operations or right handed tools !

why in the world would the developers restrict the new game plan to still defeat half of the purpose of the effort ?

[seth.madore]

---

@Sq_14 wrote:

why in the world would the developers restrict the new game plan to still defeat half of the purpose of the effort ?

---

Because it's a stop-gap measure that was quick to implement. Full support of negative -X- involves a fair bit more work, which is possible, but there are other projects that have a higher priority at the moment

[SGoldthwaite]

In Preferences > Manufacturing > Optional Features there is a checkbox for "Turn in Negative Diameter".   I enabled this, but I can't figure out how to turn in the negative diameter.  I reversed the spindle direction in my tool configuration.   In the Profile Finishing dialog box, I don't see anything that lets me do this.

[seth.madore]

It will only be visible when you have an "internal" tool selected:

 

[SGoldthwaite]

Thanks.  That did it.  I had face profiling selected