This article is aimed more at machine manufacturers than at operators.
Operators usually work with a system that is already configured for them — we could say that the hard work has already been done upstream.
But it is precisely upstream that a fundamental part of cutting quality is defined.
When executing a curve, it is essential that the cutting machine follows a correct and well-designed toolpath.
Even more critical is what happens when a curve approaches an area that has already been cut.
In this situation, the machine must:
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start a progressive deceleration
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slightly tilt the blade
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avoid letting the blade fall into the groove created by a previous cut, especially when working with closely nested pieces
This is one of the key aspects for achieving a clean and repeatable cutting quality.
The “intelligent knife” is not enough
It is true that today there are systems often referred to as “intelligent knives” (intelligent knife, call it whatever you like).
In a dedicated article, I will also discuss the patents behind this concept.
However, one fundamental point must be made clear:
as fast as these systems may be, their response time is not instantaneous.
Relying solely on blade reaction is not sufficient.
This is why a well-designed toolpath defined in advance remains absolutely essential.
Sensitive areas: selvage and stack edges
Another often underestimated aspect is the machine’s behaviour near the selvage, at the lower and upper edges of the fabric stack.
These areas are extremely sensitive:
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material thickness is reduced
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fabric stability is lower
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cutting forces have a greater impact
If the machine approaches the selvage at excessive speed, it may:
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push the fabric stack
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distort the cut
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damage pieces that are very close to the edge
Here again, it is essential that the machine slows down correctly and manages the toolpath in a controlled and coherent way.
Machine sensitivity makes the difference
There are many details that determine whether a cutting machine can truly deliver high cutting quality.
Anyone working with a machine should learn to recognise whether these behaviours are actually present.
If a machine lacks this sensitivity — on curves, on close nesting, near the edges — the desired cutting quality will never be achieved, regardless of installed power or maximum speed.
This is a very important aspect of automatic cutting.
And it is also one of the least visible when focusing only on production numbers.