Help! Curved chair back rest with contoured arch support

[casey_toia]

I am still new to Fusion but feel like I'm picking it up quite quickly. I am trying to create a model of this chair: Chair Link.

The chair has a curved back rest that also has a slight curved and protruding arch support in the back rest. The back rest is thicker on the bottom and slightly thinner on the top to support this.

I have created the curved back rest itself and am now trying to make the arch support by having it protrude out in some way. I have tried:

• Loft: Created a sketch that is using a projection from the back rest face and has the U shape contour. I keep getting non-unique coincidences issue so I made the projection happen from different points and I get rough (not very nice) loft shape working. However, I cannot figure out how to bend it to make it curve more naturally with the back rest.
• Sweep with guard rails: I created a sketch on the side profile of the backrest. The middle part of the sweep looks decent but it doesn't taper on the ends so doesn't work right.

Any advice please :). Loving the tool, just trying to get my head around this part!

My model is attached.

Current back rest image for context:

Back rest I am trying to achieve - notice the lighter parts showing the protruding arch support:

[g-andresen]

Hi,

There is no permission to download (because of personal license?).

Please share it this way:

File > export > save as f3d on local drive  > attach to post.

günther

[casey_toia]

Apologies, have attached the .f3d file to my original post now. 

[davebYYPCU · Accepted solution]

I figure you would be wanting this sorted before the fillets which are always left to very late in the timeline for this reason.

Simple loft, from the sketches you gave me.

Getting fillets to the end of the timeline was a bit more fiddly.

Might help....

[casey_toia]

Sorry for the delayed response, was night here in New Zealand. 

The surface offset is new to me and the sketch for the fillets was a great idea! Will remake it to make sure I fully understand what you did.

Thanks so much for looking at this !

[davebYYPCU]

Depending on how you are manufacturing, I would clean up the top corners a bit with a fillet to remove the sharp edge on the front faces, (a ball nose cutter will do it automatically.)

See these things after they present themselves.

Might help….