Collection of some proven standards and best practices for technical drawings - a work in progress...

1. DRAWING CONVENTIONS
工程图的习俗
best practices
最佳范例制定

2. DRAWING CONVENTIONS I
工程图的习俗
©HENNING RICHTER 2018
For critical/check dimensions, use the
standard bubble notation according to DIN-
ISO 406-10 instead of a custom marking.
针对检测尺寸，运用DIN-ISO 406-10 的椭圆
圈符号。
WRONG/错误 RIGHT/正确
BAD/不好 BETTER/更好
Use position tolerances where
possible, especially for hole patterns.
尽可能的标注位置公差，特别是
针对孔位的标注。

3. DRAWING CONVENTIONS I
工程图的习俗
©HENNING RICHTER 2018
Center lines mark a circular feature
and give a reference for dimensioning.
使用中心线表示圆形特征并提供尺
寸参考。
Don’t use 0 as a trailing figure:
11.0 is exactly the same as 11.
不要让最后的小数位上是0：
11.0其实和11是完全一样的意思。
WRONG/错误 RIGHT/正确
BAD/不好 BETTER/更好

4. DRAWING CONVENTIONS I
工程图的习俗
©HENNING RICHTER 2018
Place dimension values outside parts whenever
possible. The part view is to show the geometry,
while numeral values should be kept outside.
尽可能地将尺寸值置于零件外。零件视图展
示了零件的几何特性，所以尺寸值应该放在
零件外。 BAD/不好 BETTER/更好
WRONG/错误 RIGHT/正确
Mark redundant dimensioning (reference
dimensions) with brackets “(...)”.
将多余的尺寸用括号框起来。

5. DRAWING CONVENTIONS I
工程图的习俗
©HENNING RICHTER 2018
WRONG/错误Mark dimensions on draft angles with a
circle at the reference line’s end point.
标注带有拔模斜度的尺寸时，应在参考线
的端部画两个小圆圈。
RIGHT/正确
BAD/不好 BETTER/更好
For better readability, don’t cross
dimension lines if possible.
对于更好可读性，尽量不要让尺寸标
注线交叉。