How do i create an accurate bottle shoulder profile using radii from technical drawing

[LiamIcely]

Hi

I am trying to create a model of bottle that is close as i can get it to the technical specs from the drawings i have, however i am struggling with recreating the shoulder accurately using the radii given. the problem that i am having is that i dont know where i should put the centre point of the circle that any arcs are based on, or if it is even possible with the drawings that i have. I have been able to correctly (i think) place the first and last of the three arcs (r10,r70, and r20) that make up the profile of the shoulder, by basing them on the start and end points of the shoulder, its the middle one that i dont know where exactly to place. I don't know if the drawings are truly representive of the dimensions that come with it, so while i could just trace it with a spline, i would like to try and get it exact if possible. I have included what i have so far.

Any help that you can provide will be greatly appreciated.

[CGBenner]

@LiamIcely 

Hello, are you trying to sketch in the radii?  Or are you adding them later as Fillets?

[LiamIcely]

I am trying to sketch the radii, as i am going to revolve the profile the create the shoulder.

[TheCADWhisperer]

@LiamIcely 

Here is how I would probably start...

[LiamIcely]

Thank you very much, ill check it out

[TheCADWhisperer]

@LiamIcely 

I didn't work any on the bottom yet, but here is Shelled version (with uniform shell, I think the bottom will be thicker than the sides).

The two views in the drawing are different scale and some of the dimensions do not match the drawing.

You will need to split the drawing into two canvas views and scale each separately to get them the correct size.

[TheCADWhisperer]

@LiamIcely 

I did a bit more work on this and was about to model the bottom indentation - but I am curious - what is the purpose of this modeling exercise?

I know you stated that you wanted to model as closely to the drawing as possible, but why? Is this a school project?

I have a video for you explaining my observations once I know the objective.

[LiamIcely]

Thankyou for going into so much detail, i rally appreciate it. A friend of mine is doing a small run of a drink, and i said i would knock up some product vis shots that he could use on his website, to be honest it wouldn't need exact mm detail, i wanted to use it as a learning exercise as well, and i was able to get close, but if i need to do make something that uses the same modelling techniques but has to be exact, close may not cut it.

[TheCADWhisperer]

@LiamIcely 

Check back later for video.

Attached is my positioned and scaled canvases.

Note the 45° angled plane.

[CGBenner]

@LiamIcely 

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