hyperboloid parabolic

[jlw™]

Quite honestly that looks like a simple revolve for what is shown.  It looks like a simple roller bushing, especially with that hardness and grooves.  LMAO

I'd make one the easy way then challenge them to check it and prove it wasn't good.

[crazy^millman]

The use of the word is deceptive I agree, but what someone has done has used the shape of one and then used the shape of the other as the revolution defintion. Not correct way to define it. I would agree with others here make one and have them check it and tell you how it is wrong. If they have a sample or mastergauge to check to that would be even better. If not then make a sample and have them verify it. 

[Newbeeee™]

On ‎7‎/‎26‎/‎2018 at 8:32 PM, Colin Gilchrist said:

Honestly dude, looking at that data, I can't see how anyone would be able to "tell" what that shape was supposed to be? How are they going to measure that "Hyperbolic Parabola"?

I think that is just a load of crap, from someone who didn't understand how to properly describe the shape they want you to create.

I would draw out the intersection points (They give you the lowest diameter as 85.5mm), and construct a 3 point arc that connects the endpoints of the 33.5mm line, and bottom point.

How are they going to inspect it? Do they have a template? Or would they just be taking a series of XZ Points, along the Contour?

The method I used to make that would depend entirely on how they plan to inspect this mythical Hyperbolic Parabola.

Hahaha!

As I was reading down this thread, THIS was the exact conclusion I came to as well!

[pullo]

JoshC  : since v3.1 , or roughly 1991 . 

Ellipsed , would not be the right equation .

The nice thing about a hyperboloid parabolic is that it is in essence a ruled  surface, so you can find  cross sections in it which form a line .  The 35 degs would be  I assume the angle (measured from the axis of the bushing) which used to make a cross section would give you a linear cross section of that surface.  Having said that I don't know at the moment how that would help one to draw  the curved surface....

Gracjan

[pullo]

Ok , so the solution was so childlishly simple , once I read my own answer.  :)))))))) 

The big clue is the a) 35 degs and the fact that  that  this surface is b) a ruled surface . 

Cooking instructions : 

1. draw a circle of diameter D63 mm. in the xy plane 

2. xform it 33.5 mm along the Z - axis .

3 ROTATE THE XFORMED CIRCLE AROUND THE CENTER THE  35 degs  as the drawing specified.  Just to make it idiotproof to oneself connect the two circles' endpoints with a line . 

 This is our cross-section which forms a line.

4 . Create a ruled surface using the two arcs. Et voila! We have a  hyperbolic paraboloid 

 

Now , one has to make of course a cross section and verify the 58.5 measurement  in the waist line , but so far even I am impressed by myself for the simplicity of the

instructions that were encoded into the drawing .

 

Gracjan

 

 

[pullo]

Just as I suspected , a rotation of the upper arc of 35 degs does not give us an angle of 35 from the side , it gives us 28.3 , so the rotation angle of the upper arc should be.....

48.13 degs.  Now this gives us a waist line of 57.52 mm , so  I'm guessing the input data is somehow incorrect.  

 

 

 

 

[pullo]

So , the upper arc has to be  rotated 43.5 degs , giving us a waist line of 58.52 mm . the side angle is then 32.91 mm.

Gracjan

 

[pullo]

I know that  C-man is going to drool all over this as this descriptive geometry solution is "clean" this time around

Gracjan

 

hypergizmo.zip

 

 

[pullo]

The fact that the angle 35 vs the 32.91 that  I observed  seemed  out of  touch  I went back and rotated the line linking the two creator arcs  so that the line would be perpendicular to the projection where I am measuring the angle .... and I got a new result of 34.9 degs, so  the 2d drawing was perfectly right on the money, just as I suspected .  

Gracjan

 

[Newbeeee™]

Chapeau Gracjan

 

[Colin Gilchrist]

  

[So not a Guru]

I bow  to the deductive powers of Gracjan!

 

[Greg Williams]

Nice Work Gracjan, Your numbers look good Attached is what I get when I draw it in NX.

hyperboloid parabolic.mcam

[pullo]

Thanx guys , appreciate the appreciation , finally the  Uni degree paid off   

Gracjan 

[Matthew Hajicek - Singularity]

Beautiful, out of likes.

[HEAVY METAL]

On 7/30/2018 at 7:26 AM, pullo said:

Thanx guys , appreciate the appreciation , finally the  Uni degree paid off   

Gracjan 

Nice thanks  Thank you 

 

[pullo]

Finally  I have closure , the man himself showed up  ))))  .  Me plesha, it was a cool mind twister .

Gracjan