DIY : Pattern 1. Symmetrical Pattern Method – Jinwan Bae – Medium

There are many ways to making patterns.

You can make patterns by measuring it on the graph paper with ruler one by one.

If you can use a computer CAD, there is nothing more accurate than this.

I learned how to make patterns in Firenze by letting the center lines meet at right angles.

I will call this as symmetric pattern method.

Make a cross the center of both sides on the paper called pattern paper and when it is folded in half, make the left/right and up/down same. Making the rest using the half is the key for symmetric pattern method.

Symmetry is important because the most bags have symmetric structure

This is because the handle is placed in the same position to the left and right and the shape of bag is the same on both sides.

The symmetrical pattern method uses plain paper when making relatively big bag, so it will be less restricted for the size than a graph paper.

In case the pattern is not correct, you can immediately see that the lines themselves are dislocated, not making parallel if you fold it in half.

It is also advantageous to set the position of the other side without calculation automatically if one place is set.

But it is not easy as we think to fold exactly in half.

There may be error in folding process in half even if it is 0.1 mm.

So, I usually use symmetrical pattern method for the big bag and graph paper for small goods that are easy to find error.

Of course, bad (?) graph paper has a gap between the grids.

Then, let’s take a simple example of symmetric patterning.

For example, we are going to make a base plate of bag with 25cm x 8 cm.

Then we need to cut it bigger than this size first.

Fold the long side in half horizontally.

And then make a knife mark so that two piece of paper can be touched on one side

If you unfold and connect it, you can cut one side of rectangle. This line is perpendicular to the horizontal half line.

Is it amazing?

This principle is the core of the symmetric patterning.

Now, measure the opposite side of 25cm side and make a knife mark on it. When you spread this out and connect the two marks, both lines meet at right angle with the horizontal center line and the both lines become parallel lines.

It’s amazing.

Now, fold it in half vertically.

When you fold it, the center point and the top fold line should be matched.

If it is not matched, the entire shape can be unmatched and becomes asymmetry. So you need to be careful.

And when you unfold it, you can see the cross at right angle in the center and you will find the same center line to the left and right.

Now, fold it vertically again and find the vertical line to cut. For example, if it is 8 centimeters wide, make a knife mark on the 4 centimeters spot.

And unfold it and connect that point to cut.

The remaining lines are folded horizontally and one side is cut to 4 centimeters wide. So you can cut the remaining 4 centimeters based on this.

Then you can make a base of 25cm X 8cm.

How was it?

It can be a bit complicated to explain in the photo.

But once you know how to do it, I think there is nothing as quick and accurate as the symmetrical cutting method.

However, there will be an error in folding process, so you need to practice a lot.

If you know the symmetric patterning, you have already become an expert on patterns.

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