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MARK THE ESSENTIAL!
把要点的标志!
CHECK DIMENSIONS
检测尺寸
CHECK DIMENSIONS
检测尺寸
©HENNING RICHTER 2018
Technical drawings contain many dimensions. If the part has been designed carefully,
the mechanical designer will have considered each value and tolerance thoroughly.
Those dimensions that…
have functional or
safety significance,
that determine whether the part fits or
that have an effect on the product’s look & feel
must be marked as check dimensions (DIN 406-10).
If there are no check dimensions in the drawing, OQC and IQC have to measure every
dimension specified, including fillets, chamfers, thread depths and further values that
are difficult to check. With check dimensions in place, it’s only the first samples that
QC needs to measure entirely while all upcoming quantities only need the check
dimensions to be measured.
CHECK DIMENSIONS
检测尺寸
©HENNING RICHTER 2018
工程图纸有很多尺寸。如果是细心做的设计,做这个设计的工程师应该能仔细考
虑每一个尺寸和每一个公差。
运行的,
安全的,
适合的或者
外观和感觉的尺寸
必须标 志检测尺寸 (DIN 406-10)。
如果图纸没有检测尺寸,OQC和IQC必須把每一個尺寸都检查,包括圆角,倒角,
螺纹的深度和其他难测试的尺寸。用检测尺寸,第一次来的样品完整尺寸测试以
后,只需要测试检测尺寸。
CHECK DIMENSIONS
检测尺寸
©HENNING RICHTER 2018
Let’s look at a very simple turntable assembly example.
It consists of the rotation-symmetric turntable, a standard
angular ball bearing, a square body, a standard radial
bearing as well as a standard M20 washer and nut.
我以下就要说一个很简单转台组件的范例。 这个组件
有一颗轴对称的转盘,一颗标准的角面接触轴承,一
个方形的底座,一颗标准的径向滚动轴承和一套M20
的垫圈跟螺母。
CHECK DIMENSIONS
检测尺寸
©HENNING RICHTER 2018
Safety critical dimension:
If the plate’s thickness underruns the specified 10mm, the
allowed load may cause the turntable to break.
安全相关的尺寸:
要是转台的厚度比10mm小,允许的负荷可能折断转台。
Clearance critical dimension:
If the axle’s diameter exceeds
20mm, it will not fit into the
bearing’s inner diameters.
间隙相关的尺寸:
要是轮轴的直径比20mm大,
轴承的内直径会容不下。
Function critical dimension:
If the axle’s length exceeds 46mm, it may interfere
with the surface that the turntable is placed on.
功能相关的尺寸:
如果轮轴的长度比46mm大,可能会与组件下
面的面积重叠。
Turntable 转台
Function critical dimension:
If the contact area for the angular bearing’s
inner ring exceeds Ø32.3mm,
(DIN2768) it might touch its outer ring.
功能相关的尺寸:
如果角面接触球轴承内环的接触面积比
Ø32.3mm大(GB/T1804),可能会接触外环。
CHECK DIMENSIONS
检测尺寸
©HENNING RICHTER 2018
Clearance critical dimension:
If the hole depth falls below 24.5mm, it may not hold the
height of the stack that’s formed by ball bearing, washer and
nut, causing the nut to block out on the placement area.
间隙相关的尺寸:
如果孔的深度比24.5mm小,容不下轴承,螺母和垫圈的堆。
Function & clearance critical
dimensions:
The transition fit allows for a well
defined and tight seat of the
bearing in the body.
功能和间隙相关的尺寸:
对轮轴的好地定义位置要有过渡
配合。
Body 底座 Function critical dimension:
Corresponding with the turntable axle’s length, if the seat of the angular
ball bearing is less that 39mm above the bottom, the axle may block out.
功能相关的尺寸:
要是轴承座的高度比39mm大,轮轴肯能接触组件下面的面积。
CHECK DIMENSIONS
检测尺寸
©HENNING RICHTER 2018
By placing critical dimensions, the outgoing /
incoming material dimension checking has
been reduced to altogether 8 instead of 21.
Difficult fillet, chamfer and thread dimension
checking has been avoided altogether.
用检测尺寸的时候,只有8出货和进货检验
的尺寸。不用检验每一个都尺寸,不用检
验难办的圆角,倒角和螺纹。

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Check dimensions

  • 2. CHECK DIMENSIONS 检测尺寸 ©HENNING RICHTER 2018 Technical drawings contain many dimensions. If the part has been designed carefully, the mechanical designer will have considered each value and tolerance thoroughly. Those dimensions that… have functional or safety significance, that determine whether the part fits or that have an effect on the product’s look & feel must be marked as check dimensions (DIN 406-10). If there are no check dimensions in the drawing, OQC and IQC have to measure every dimension specified, including fillets, chamfers, thread depths and further values that are difficult to check. With check dimensions in place, it’s only the first samples that QC needs to measure entirely while all upcoming quantities only need the check dimensions to be measured.
  • 3. CHECK DIMENSIONS 检测尺寸 ©HENNING RICHTER 2018 工程图纸有很多尺寸。如果是细心做的设计,做这个设计的工程师应该能仔细考 虑每一个尺寸和每一个公差。 运行的, 安全的, 适合的或者 外观和感觉的尺寸 必须标 志检测尺寸 (DIN 406-10)。 如果图纸没有检测尺寸,OQC和IQC必須把每一個尺寸都检查,包括圆角,倒角, 螺纹的深度和其他难测试的尺寸。用检测尺寸,第一次来的样品完整尺寸测试以 后,只需要测试检测尺寸。
  • 4. CHECK DIMENSIONS 检测尺寸 ©HENNING RICHTER 2018 Let’s look at a very simple turntable assembly example. It consists of the rotation-symmetric turntable, a standard angular ball bearing, a square body, a standard radial bearing as well as a standard M20 washer and nut. 我以下就要说一个很简单转台组件的范例。 这个组件 有一颗轴对称的转盘,一颗标准的角面接触轴承,一 个方形的底座,一颗标准的径向滚动轴承和一套M20 的垫圈跟螺母。
  • 5. CHECK DIMENSIONS 检测尺寸 ©HENNING RICHTER 2018 Safety critical dimension: If the plate’s thickness underruns the specified 10mm, the allowed load may cause the turntable to break. 安全相关的尺寸: 要是转台的厚度比10mm小,允许的负荷可能折断转台。 Clearance critical dimension: If the axle’s diameter exceeds 20mm, it will not fit into the bearing’s inner diameters. 间隙相关的尺寸: 要是轮轴的直径比20mm大, 轴承的内直径会容不下。 Function critical dimension: If the axle’s length exceeds 46mm, it may interfere with the surface that the turntable is placed on. 功能相关的尺寸: 如果轮轴的长度比46mm大,可能会与组件下 面的面积重叠。 Turntable 转台 Function critical dimension: If the contact area for the angular bearing’s inner ring exceeds Ø32.3mm, (DIN2768) it might touch its outer ring. 功能相关的尺寸: 如果角面接触球轴承内环的接触面积比 Ø32.3mm大(GB/T1804),可能会接触外环。
  • 6. CHECK DIMENSIONS 检测尺寸 ©HENNING RICHTER 2018 Clearance critical dimension: If the hole depth falls below 24.5mm, it may not hold the height of the stack that’s formed by ball bearing, washer and nut, causing the nut to block out on the placement area. 间隙相关的尺寸: 如果孔的深度比24.5mm小,容不下轴承,螺母和垫圈的堆。 Function & clearance critical dimensions: The transition fit allows for a well defined and tight seat of the bearing in the body. 功能和间隙相关的尺寸: 对轮轴的好地定义位置要有过渡 配合。 Body 底座 Function critical dimension: Corresponding with the turntable axle’s length, if the seat of the angular ball bearing is less that 39mm above the bottom, the axle may block out. 功能相关的尺寸: 要是轴承座的高度比39mm大,轮轴肯能接触组件下面的面积。
  • 7. CHECK DIMENSIONS 检测尺寸 ©HENNING RICHTER 2018 By placing critical dimensions, the outgoing / incoming material dimension checking has been reduced to altogether 8 instead of 21. Difficult fillet, chamfer and thread dimension checking has been avoided altogether. 用检测尺寸的时候,只有8出货和进货检验 的尺寸。不用检验每一个都尺寸,不用检 验难办的圆角,倒角和螺纹。