Design question

[Anonymous]

Dear Sir/ Manam

I want to ask you something .I was watcing a tutorial video and the proffesional draw this drawing 

(screenshot1)

when he started to drawing ,he used a polyline to create the drawing

 

HOW he  understand,that he should use the command :polyline  to start creating the drawing, when he saw the screeshot 1?

[imadHabash · Accepted solution]

HI,

since a POLYLINE is a connected sequence of line segments usually when you start to creat 3D objects POLYLINES are the right and proper command for all 3D commands ( Extrude,Presspull,Sweep....etc).

[Alfred.NESWADBA · Accepted solution]

Hi,

>> HOW he  understand,that he should use the command :polyline  to start creating the drawing,

>> when he saw the screeshot 1?

I guess this could be the answer:

In screenshot 1 you can see this contour that is then revolved to built up the body:

And the red contour seems to be the polyline object from your screenshot 2.

- alfred -

[Anonymous]

i want to ask you something else.

1)How did he understand that he must start with this manner the drawing?

2)when did he find the dimension 0.625 in the screenshot i do not see this dimension.?

[Anonymous]

I had broken my mind to try to find the answer.

Now i undertand with your help how he started the exersice.Thank you,very match for your help.

 

very difficult exersice for me without your help!!1

[Alfred.NESWADBA · Accepted solution]

Hi,

>> How did he understand that he must start with this manner the drawing?

Training and/or experience. 😉

There are also other ways to get that done (starting 3D with outer cylinder, inner cylinder, ...), starting with 2D contours is in most cases the easier one.

>> when did he find the dimension 0.625 in the screenshot i do not see this dimension.?

You can see the

• outer cylinder with the inner diameter 1,75 ==> radius 0.875
• inner cylinder with an outer diameter 0.5 ==> radius 0.25

Result is 0.875 - 0.25 = 0.625

. alfred -