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The Concept Of Seesaw

2010/6/1 17:13:00 41

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Seesaw

The word "sedan" is a special term for footwear design.

The problem of sedan is not only a technical problem, but also a cognitive problem.

First of all, straighten out

The concept of seesaw.

Generally speaking, "stilts" refers to the angle of space.

Because once a space angle is added to the sample in the plane, the plane template will be inserted.

Become a surface state.

In the shoemaking process, the "sedan setting" is the operation of pforming the plane to the surface.

Since it is a corner, it can measure and measure its angle, so the measurement of the angle is the measurement of the size of the space angle.

Drawing knot

In the design drawing, we need to use the pick off angle. If the actual measurement angle is too cumbersome, the equal arc equivalent angle is adopted in the application.

Simple measurement method, only the length of the arc line, no amount of angle value.

Taking off is a verb. It refers to processing the seesaw degree, increasing a space angle or reducing a space angle.

Take notes and tune

Stilts are not a concept.

We already know that the last surface is a spatial surface. If the middle point O of the front control line VH is the center, 1 / 2 VH is the radius.

How about the angle of the circle?

If the angle of a plane circle is 360 degrees, will the last circle be 360?

In order to verify the angle of the last circle, the flat circle with equal radius can be cut off, and the center of the circle is overlapped on the last surface to verify it.

This will happen.

Now, the plane circle can not be pasted on the surface circle of the last, from which we can know that the angles of the two circles are not the same.

Which circle will have a bigger angle?

Some?

We can cut the flat circle along the radius and then overlap it on the last surface circle.

At this point, the circle of the plane can be attached to the last surface.

It is found that there is a notch angle in the plane circle.

That is to say, the angle of the surface circle is greater than the 360 degree angle of the plane circle, and the more quantity is the nick angle.

As shown in Fig. 0-1, the A in the figure is a plane circle, which will produce a notched angle when it is attached to the last surface.

Another test can be done.

The last method is to remove the surface circle on the last and then paste it flat.

If you want to smooth the surface circle, you must cut it along the radius and paste it on the surface circle.

Now a overlapping angle, rather than a notched angle, is shown in B in the picture.

This also shows that the surface circle is greater than the 360 degree angle of the plane circle.

Whether the notch angle or overlap angle is good, if the test conditions are strict, their size is equal, the effect is the same: in order to be able to be deficient.

There is a deeper understanding of the angle and overlap angle. This angle is defined as natural stilts.

The reason is very simple, just like an umbrella. If you use a complete round cloth, you cannot make an umbrella with an arched state.

The shape of cloth can be separated from the center and added a certain amount of angle to get the umbrella shape of curved surface.

Such examples are very common in everyday life, such as

The tennis caps on the head, the stockings on the feet, the bra for the ladies, the underwear for men's trousers, the seams of the tops, the crook of the crotch, and so on.

The use of space angle to complete the three-dimensional modeling, but the names of various industries are different.

"Seesaw" is a special term for shoemaking industry.

The function of the plane can be converted into a three-dimensional shoe cavity.

Source: world clothing shoes and hats