Hyperbolic Paraboloid!

[orbitmansion]

Please excuse my lack of knowledge, but I was hoping that someone will be able to understand what I'm trying to achieve and point me in the right direction...

I have created a design in Tinkercad and exported it to Fusion360 in order to finish it off, however I'm unable to get my head around the right functions in order to increase the height of each side on the Y axis very slightly (by 1.2mm to be precise), without increasing the height on X axis but also still maintaining the relative curvature of the top face.

I've attached a couple of screenshots to highlight what I mean, along with the F3d file of said design.

If there is someone who can shed some light on this for me I would be very grateful indeed!

Thanks in advance 🙂

[aliobidi]

Hi , 

I didn't get what you mean 
to be sure look at the pic (green line is y axis and red one is x axis , blue is z axis ) 
if you want change just y axis without effected on x axis just use scale tool (non uniform ) 
if something else what you want just explain more please  

[etfrench]

I would start fresh with Design History turned on.  It will also be much easier if the Origin was centered on the model.

The screencast shows how to redraw the outer ellipse with Y axis 1.2mm larger. Just repeat the process for the inner ellipse.

If you delete the fillet, you can get the total height to extrude the new model.  You can either use a two direction chamfer, or the draft tool to create the chamfer for the top.  If there is a curve to the top, then draw the profile and use a sweep.

[orbitmansion]

Thanks for that, although I'm not sure if that targets the height of the points as indicated in my example pictures?

Again, please excuse my lack of knowledge but I'm trying to increase the height of the outer edges of the top elliptical face by 1.2mm - not the overall width - unless I've misunderstood your explanation!!

I've mocked up an example in photoshop using the warp tool - granted, it's over the top and the final result will be much more subtle in gradient, but hopefully it demonstrates what I'm after.

Thanks again

[aliobidi]

you can make a profile and sweep it like pic below 

but curvature of the top face will be like this 

or you can select the two profile that show in pic 1 and sweep them 
and this is the result 

your file below 

[etfrench]

Do you want the ring to be higher across the full width and only on the major axis (X)? Y axis would remain the same height.  Or do you want the outside point to be raised around the entire ring or just on the X axis?

p.s. This thread may help

[orbitmansion]

Thanks for your reply 🙂

yes, so it's the Y axis that I'm looking to modify, across the whole width of each side. If you take a look at the image, the Y Axis needs to be 1.2mm higher than X Axis (both inside and outside edge) so that it becomes a hyperbolic paraboloid, in effect!

Thanks again for your continued help with this...

 

[davebYYPCU · Accepted solution]

Like this?  Dark is new light is old.

Might help.....

[orbitmansion]

Yes Dave!! That's it, thanks 😀

Would you mind recording a screencast of your step by step actions as it'd be great to see how you put it all together in real-time, so then I can recreate on other files that I have? Of course I can see the timeline at the bottom, but they're of the already completed steps...

I'm excited to have a play with the inner points too giving me the flexibility of keeping them level and only tweaking the outer points by 1.2mm.

Thanks again Dave 😁