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2d drafting mark meaning


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I am reading 2d drafting to draw 3d model with Inventor. But I couldn't well understand meaning of this mark. 

There are some dimension (red circle) which make me confused.

 

Inked1.thumb.jpg.b5f501493b78f86636d9e3f7667245c1.jpg

 

I am drawing the blue part, and here what I draw so far.

 

 

2.thumb.JPG.bea839eca36151612f4980d3e66b195d.JPG

 

I am still confusing the size of the thickness of the part and the hole on the surface.

 

Could you give me some idea?

 

Thank you. 

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Looks to be the sizes of the rectangular and square tubing.

 

The cutout is for the 100 x 100 x 8 Square Tubing 1.286 long and should be all the way through the 2 plates since it shows continuous lines. The 8 is the wall thickness of the tubing, just like the 20 is the plate thickness.

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15 minutes ago, SLW210 said:

Looks to be the sizes of the rectangular and square tubing.

 

The cutout is for the 100 x 100 x 8 Square Tubing 1.286 long and should be all the way through the 2 plates since it shows continuous lines. The 8 is the wall thickness of the tubing, just like the 20 is the plate thickness.

 

then the Tubing is continuously enlarging from the size 100 x 80 to 100 x 100?

 

3.JPG.fdb825534b07b8175a74b9c0b6f81f4b.JPG

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Would seem to be 2 different tubes you are referring to.

 

Is that the only view you have?

 

Are you knowledgeable in steel shapes and dimensions?

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23 hours ago, SLW210 said:

Would seem to be 2 different tubes you are referring to.

 

Is that the only view you have?

 

Are you knowledgeable in steel shapes and dimensions?

 

Now I am understand this draft! 

Two different Tubing is connecting with another Tubing!

Thank you so much. It was really helpful! 

 

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