The price of constructive implementation of parameters

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4.7.1 Pattern of drawing sketch
The sketch layout expresses only the basic constructive idea of the mecha-
tronic module, the pattern of drawing sketch reveals this idea more fully. In 
the sketch configuration, only a pre-selected part of the technical requirements 
is realized without a detailed consideration of the possibilities for future 
implementation of the remaining requirements. The pattern of drawing sketch 
takes into account a much larger number of requirements, and that is why the 
main idea in it, if unchanged in comparison with the idea of a sketch layout, is 
in any case tied to all these requirements.Drawing sketch can combine the first 
large-scale layout with non-scaled sketches.
The outlines of the sketch layout are, as a rule, executed in full scale. But, 
despite the great completeness and scale, it is still far from drawing the final 
layout.
An important circumstance that distinguishes the development of a sketch 
layout from the creation of the initial sketch is the need for a certain sequence 
in the drawing of individual nodes. 
First of all, the contours of the nodes with the largest dimensions (engine, 
motion transducers) located in the most constrained areas and not giving the 
designer the opportunity to vary their configuration, orientation and location 
are put on the drawing. Successful placement of these nodes in the drawing 
gives the designer confidence that the remaining nodes (position sensors, 
brakes, etc.), which will be applied further in the final layout drawing, will 
not significantly worsen the created layout. Each node applied in the drawing 
imposes specific restrictions on subsequent nodes, and therefore not only the 
rationality of the layout creation process, but also the form in which it pours 
depends on the sequence of drawing. At this stage, the designer must make sure 
that the version of the draft outline drawing chosen by him is close to optimal. 
The design may contain enough elements to meet the requirements, but not 
all elements may be necessary for this purpose. To fulfill the «necessary and 
sufficient» condition, the construction should be checked for «redundancy», 
i.e. try to find and eliminate all that is superfluous. Everything superfluous, 
not necessary in the design, can be thought of as «stocks» and divided into 
two groups: stocks according to the technical requirements for the mechatronic 
module and stocks by the parameters of the self-design that are not directly 
related to the technical requirements, first of all, excessive margins and 
stiffness.
Reserves for any parameter of the technical requirements implemented in 
design, indicate the deviation of the generated conceptual design from another, 
more rational. With the introduction of the scale, as detail of the drawing of 

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conceptual layout and transition to the final drawing of the layout of the stock-
pile destruction of the first group becomes more and more effective means of 
improving layout and design.
The voids in the structure, indicating the irrationality of the layout can be 
considered as stock in terms of available space. The presence of such reserves 
tells about the underutilization of the criterion of minimizing the size. The 
emptiness inside the mechatronic module can be eliminated by a rearrangement 
of parts. This is achieved by reducing the size. Sometimes it is beneficial, 
while maintaining the dimensions of the mechatronic module, use the void 
for constructive combinations, to better meet any other requirements, such as 
accuracy, vibration, operator comfort, etc. 
Stocks in the parameters of geometric nature (for example, by angular and 
linear displacements of moving parts) are easy to spot on the drawing, what can 
be said about stocks on such parameters, such as output power or the accuracy 
of the rotation angle. When searching for hidden stocks designer should not 
forget about the concept, because the transition from it to the design especially 
easy to prevent redundancy.
A consequence of the reduced inventory of stiffness or strength (reserves 
of the second group) of individual parts of the mechatronic module is the 
reduction of their mass. In real designs, where everything is interconnected, 
the reduction of the size and weight of the individual parts is causing far-
reaching consequences. In particular, the reduced mass, accompanied by a 
reduction in the stiffness characteristics in any detail, may at the same time 
be accompanied by improving other rigidity characteristics, is essential for 
the normal functioning of the mechatronic module as a whole. Thus can be 
obtained a considerable gain in reliability. 
With the magnitude of the various «stocks» linked to the selection of types 
and dimensions of finished products included in the design of mechatronic 
module. For example, the weight and dimensions of the motor are determined by 
developing them power. Reducing required power by reducing any «reserves» in 
mechatronic module gives you the opportunity to go to neighboring on a scale 
of size smaller engine. But such abrupt terms of weight and dimensions of the 
transition almost always opens up new opportunities for better layout options. 
It often happens that the implementation of these features componentattribute 
completely different, becomes more rational.
Further design is carried out, as it were, on a new «level of rationality» of 
the layout, in which the possibilities of sealing the functional load of the parts, 
the possibility of their adaptation and partial «integration» and the benefits of 
reducing the reserves of both groups are realized to the maximum extent.
Reducing the reserves of the second group is not an easy task, requiring 
careful calculations and knowledge of the technological capabilities of today.

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