Lesson 32 Limits and Tolerances 机械工程专业英语 教学课件
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课文分析
机械wk.baidu.com程专业英语
Lesson 32 Limits and Tolerances
Limit dimensioning is a system of dimensioning where only the maximum and minimum dimensions are shown. 标注极限尺寸是仅仅表示极大和极小尺寸的一种尺 寸标注制度。
extremely long
strokes. In addition, wear
is minimized because the
force and
synchronization systems
are independent.
预备知识
机械工程专业英语
Lesson 32 Limits and Tolerances
In other words, each part of a machine or mechanism is made to a certain size and shape so it will fit into any other machine or mechanis of the same type. 换句话说，每一个机器或机构的零件应制造成具有 一定的尺寸和形状以便使之能装入到任何其他同类 型的机器或机构中。
These are known as the limits.The difference between upper and lower limits is called the tolerance. 这两个尺寸被称为极限尺寸。最大和最小极限尺寸 之间的差值就称做公差。
A tolerance is the total permissible variation in the size of a part.
Bilateral tolerancing is a system of dimensioning where the tolerance (that is variation) is split and is shown on either side of the nominal size.
标注双向公差是将公差(亦即变化量)拆分开，分别 表示在公称尺寸两侧的一种尺寸标注制度。
as tough, nearly impossible gripper applications
BUT are priced competitively with commodity
products! ZAYTRAN gripper technology provides
precision in extreme environments such as clean
The amount of this variation depends on the kind of part being manufactured.
偏差的大小取决于要制造零件的种类。
课文分析
机械工程专业英语
Lesson 32 Limits and Tolerances
For example, a part might be made 6 in. long with a variation allowed of 0.0003 (threethousandths)in. above and below this size. 例如，一个零件6英寸长，其长度偏差为±0.003英 寸(即正负千分之三英寸)。
rooms, grinder loading, automotive, and die
casting.
预备知识
机械工程专业英语
Lesson 32 Limits and Tolerances
一、预备知识
ZAYTRAN's patented
helix synchronization
system facilitates
English for Mechanical Engineering
机械工程专业英语
常州工学院机电工程学院
徐红丽
机械工程专业英语
Lesson 32 Limits and Tolerances 一、预备知识
Grippers by ZAYTRAN are universally applicable
课文分析
机械工程专业英语
Lesson 32 Limits and Tolerances
To make the part interchangeable, each individual part must be made to a size that will fit the mating part in the correct way. 为了使零件具有互换性，每个零件都必须把它制造 成一定尺寸以便将以合适的方式装入到与其相配合 的零件中去．
二、词汇 interchangeable 可互换的
tolerance 公差
词汇
机械工程专业英语
Lesson 32 Limits and Tolerances
三、课文分析 Machine parts are manufactured so they are
interchangeable. 制造机器零件应使它们具有互换性。
Therefore, the part could be 5.997 to 6.003 in. and still be the correct size. 因此该零件可以是5.997到6.003英寸长，而仍然是 合格的尺寸。
课文分析
机械工程专业英语
Lesson 32 Limits and Tolerances
Lesson 32 Limits and Tolerances
When the tolerance is in both directions from the basic size, it is known as a bilateral tolerance (plus and minus). 当公差分布于基本尺寸的两侧，那就叫做双向公差 或叫正负偏差．
公差是一个零件尺寸允许的总的变化范围。
课文分析
机械工程专业英语
Lesson 32 Limits and Tolerances
The basic size is that size from which limits of size are derived by the application of allowances and tolerances. 基本尺寸是从该尺寸出发，运用偏差和公差推导出 极限尺寸所依据的尺寸．
Sometimes the limit is allowed in only one dirction. This is known as unilateral tolerance. 有时极限尺寸仅允许在单一方向上。这就叫做单向 公差。
课文分析
机械工程专业英语
Lesson 32 Limits and Tolerances Unilateral tolerancing is s system of dimensioning where the tolerance(that is variation) is shown in only one direction from the nominal size. 单向公差标注是公差(亦即偏差)仅在基本尺寸(又叫 公称尺寸)的一侧表示的尺寸标注制度。
Unilateral tolerancing allowthe changing of tolerance on a hole or shaft without seriously affecting the fit. 单向标注公差的孔或轴的公差发生变化而不会影响 其配合性质。
课文分析
机械工程专业英语
"out-of-the-box". The use of third-generation
ZAYTRAN technology and the selection of super
tough, corrosive resistant materials allow these
products to efficiently serve day-to-day as well
It is not only impossible, but also impractical to make many parts to an exact size.
把许多零件制造成精确的尺寸，那不仅是不可能的，
而且也是不实际的。
课文分析
机械工程专业英语
Lesson 32 Limits and Tolerances
This is because machines are not perfect, and the tools become worn.A slight variation form the exact size is always allowed. 这是因为机床总是存在误差的，刀具也会逐渐磨损 的，相对精确尺寸稍有点偏差也是允许的。
Thus, the tolerance is the difference between these two dimensions. 因而，公差就是这两个极限尺寸之间的差值。
课文分析
机械wk.baidu.com程专业英语
Lesson 32 Limits and Tolerances
Limit dimensioning is a system of dimensioning where only the maximum and minimum dimensions are shown. 标注极限尺寸是仅仅表示极大和极小尺寸的一种尺 寸标注制度。
extremely long
strokes. In addition, wear
is minimized because the
force and
synchronization systems
are independent.
预备知识
机械工程专业英语
Lesson 32 Limits and Tolerances
In other words, each part of a machine or mechanism is made to a certain size and shape so it will fit into any other machine or mechanis of the same type. 换句话说，每一个机器或机构的零件应制造成具有 一定的尺寸和形状以便使之能装入到任何其他同类 型的机器或机构中。
These are known as the limits.The difference between upper and lower limits is called the tolerance. 这两个尺寸被称为极限尺寸。最大和最小极限尺寸 之间的差值就称做公差。
A tolerance is the total permissible variation in the size of a part.
Bilateral tolerancing is a system of dimensioning where the tolerance (that is variation) is split and is shown on either side of the nominal size.
标注双向公差是将公差(亦即变化量)拆分开，分别 表示在公称尺寸两侧的一种尺寸标注制度。
as tough, nearly impossible gripper applications
BUT are priced competitively with commodity
products! ZAYTRAN gripper technology provides
precision in extreme environments such as clean
The amount of this variation depends on the kind of part being manufactured.
偏差的大小取决于要制造零件的种类。
课文分析
机械工程专业英语
Lesson 32 Limits and Tolerances
For example, a part might be made 6 in. long with a variation allowed of 0.0003 (threethousandths)in. above and below this size. 例如，一个零件6英寸长，其长度偏差为±0.003英 寸(即正负千分之三英寸)。
rooms, grinder loading, automotive, and die
casting.
预备知识
机械工程专业英语
Lesson 32 Limits and Tolerances
一、预备知识
ZAYTRAN's patented
helix synchronization
system facilitates
English for Mechanical Engineering
机械工程专业英语
常州工学院机电工程学院
徐红丽
机械工程专业英语
Lesson 32 Limits and Tolerances 一、预备知识
Grippers by ZAYTRAN are universally applicable
课文分析
机械工程专业英语
Lesson 32 Limits and Tolerances
To make the part interchangeable, each individual part must be made to a size that will fit the mating part in the correct way. 为了使零件具有互换性，每个零件都必须把它制造 成一定尺寸以便将以合适的方式装入到与其相配合 的零件中去．
二、词汇 interchangeable 可互换的
tolerance 公差
词汇
机械工程专业英语
Lesson 32 Limits and Tolerances
三、课文分析 Machine parts are manufactured so they are
interchangeable. 制造机器零件应使它们具有互换性。
Therefore, the part could be 5.997 to 6.003 in. and still be the correct size. 因此该零件可以是5.997到6.003英寸长，而仍然是 合格的尺寸。
课文分析
机械工程专业英语
Lesson 32 Limits and Tolerances
Lesson 32 Limits and Tolerances
When the tolerance is in both directions from the basic size, it is known as a bilateral tolerance (plus and minus). 当公差分布于基本尺寸的两侧，那就叫做双向公差 或叫正负偏差．
公差是一个零件尺寸允许的总的变化范围。
课文分析
机械工程专业英语
Lesson 32 Limits and Tolerances
The basic size is that size from which limits of size are derived by the application of allowances and tolerances. 基本尺寸是从该尺寸出发，运用偏差和公差推导出 极限尺寸所依据的尺寸．
Sometimes the limit is allowed in only one dirction. This is known as unilateral tolerance. 有时极限尺寸仅允许在单一方向上。这就叫做单向 公差。
课文分析
机械工程专业英语
Lesson 32 Limits and Tolerances Unilateral tolerancing is s system of dimensioning where the tolerance(that is variation) is shown in only one direction from the nominal size. 单向公差标注是公差(亦即偏差)仅在基本尺寸(又叫 公称尺寸)的一侧表示的尺寸标注制度。
Unilateral tolerancing allowthe changing of tolerance on a hole or shaft without seriously affecting the fit. 单向标注公差的孔或轴的公差发生变化而不会影响 其配合性质。
课文分析
机械工程专业英语
"out-of-the-box". The use of third-generation
ZAYTRAN technology and the selection of super
tough, corrosive resistant materials allow these
products to efficiently serve day-to-day as well
It is not only impossible, but also impractical to make many parts to an exact size.
把许多零件制造成精确的尺寸，那不仅是不可能的，
而且也是不实际的。
课文分析
机械工程专业英语
Lesson 32 Limits and Tolerances
This is because machines are not perfect, and the tools become worn.A slight variation form the exact size is always allowed. 这是因为机床总是存在误差的，刀具也会逐渐磨损 的，相对精确尺寸稍有点偏差也是允许的。
Thus, the tolerance is the difference between these two dimensions. 因而，公差就是这两个极限尺寸之间的差值。
课文分析