Drawing a stool in 3d

[nicolas]

Hi Everybody,

I want to draw a stool in 3d having 4 nos. legs say 35mm x 35mm. The base is an imaginary square of 400 x 400 and the 4 legs base are placed at the 4 nos. corners. Then the imaginary top is 350x350 at an elevation of 700 from the base. A line is drawn from one of the leg bottom vertice to the leg top vertice and the leg base is extruded along the angular path and using the array command, the four legs are drawn as expected. However, I am having big trouble in drawing supporting members always 35x35 say some 150mm. from the base that need to be connected to the four legs.

 

The problem is that I don't have the drawing right away with me but if anybody understand, that will be great to have some clues for now.

 

Thank you very much.

 

 

 

 

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:)

[ReMark]

Are the supporting members horizontal or an an angle?

[ReMark]

By now you must have figured it out since there has been no response to my question. If you haven't then look at the attached image. Both the horizontal (between leg support) and the diagonal (leg to bottom of stool seat) were both easily constructed by reorienting the UCS.

 

 

The non-use of your dimensions and shapes was done on purpose. I'm just demonstrating a technique here.

[nicolas]

Hi,

 

I was already offline when you reply. I will send you the detail right away but I will like to know how you reorient the ucs to have the horizontal member and connect it to the angular legs.

 

Thank you in advanced.

stool 3d problem.pdf

[ReMark]

I'm old-fashioned when it comes to reorienting the UCS. In the case of the horizontal chair rail or rung (can't recall the correct terminology) I used the 3-point method. My base point is the intersection of the two horizontal construction lines that meet at the center of the left front leg. My positive X is in the direction of the right front leg and my positive Y is the diagonal centerline of the left front chair leg itself. In my example I then created a new centerline starting at the midpoint of the left front leg to the midpoint of the right front leg. This was used as the basis for the chair rung. Got it?

[nicolas]

Well that is before I read your solution, which I will try tonight.

 

Hi everybody,

 

I am still struggling with adding the supporting members to the stool. I have prepared a pdf of the front view of the chair. I have colored the legs green and the centre line of the supporting member to add I have colored red. I try to draw a polyline of the face of one of the supporting member but utterly failed. I have drawn the two blue lines to help me construct the face of the supporting member but at where I circled the connection, I do not have any snap. Even apparent intersection does not work.

 

Regards,

Nicolas.

front view.pdf

[ReMark]

The keys to success are using centerlines and making sure to orient your UCS in the proper plane. My example proves it can be done.

[ReMark]

Look at the image below. Notice the short line drawn from the center of one leg to the center of the other. This is the centerline of our chair rung. It is important that this line be moved up the legs in alignment with their angle. This is done by reorienting the UCS. Before I do this I set the origin of my UCS at the center of the left front leg. Then I reorient the UCS using the 3-point method. The center of the left front leg is the base point. The center of the right front leg is my direction of positive X and the center of the TOP of the left front leg is my direction of positive Y. This makes the angle of the UCS equal to the angle of the stool leg as it travels from the floor to the bottom of the stool. Now I move the short line up the leg. Then I SWEEP a circle equal to the diameter of the rung and use UNION to tie the legs and rung together. Got it?