Why is my slant dimension is not equal to original diagram?

[kingston123]

My diagram: View attachment 2110 (I marked with red colour)

Original Diagram: View attachment 2111

Why is my slant dimension is not equal to original diagram?

 

[MrCATIA]

The top chamfers are wrong because you didn't follow the dimensions in the drawing. You should have dimensioned both chamfers with the 16 x 16 dimensions, and ignore the 32 dimension.

The 40mm dimension on the drawing is the height of the center gusset.

View attachment 2112

 

[kingston123]

Why is my 40mm dimension on the drawing wrong?

 

[MrCATIA]

Why is my 40mm dimension on the drawing wrong?

Look closely at the 3-view drawing in your original post.
View attachment 2113

The 40mm dimension (circled in red) does not define the chamfers - it defines the height of the gusset

The chamfers are dimensioned with the two 16 mm dimensions (circled in blue)

 

[kingston123]

The 40mm dimension (circled in red) does not define the chamfers - it defines the height of the gusset

What is the meaning of gusset? How does it look like?

 

[MrCATIA]

What is the meaning of gusset?

search result for "definition of gusset"
View attachment 2115

How does it look like?

The gusset is the orange feature in the picture below. It can also be called a "rib" or "stiffener"
View attachment 2114