---
title: "什么是锯缝？为什么每份下料清单都必须计入"
description: "锯片的宽度在悄悄改变每一个尺寸。这里讲怎么正确处理它。"
image: "https://nestingcalc.com/og-default.png"
url: "https://nestingcalc.com/cn/guides/what-is-kerf/"
locale: "zh-Hans"
---

# 什么是锯缝？为什么每份下料清单都必须计入

锯片的宽度在悄悄改变每一个尺寸。这里讲怎么正确处理它。

## 锯缝的定义

锯缝是锯切时锯片切掉的槽——变成锯屑的那部分材料。锯片不是零宽的线：圆锯的典型锯缝为 2–3.5 mm，带锯 1–1.5 mm，激光与水刀切割则小于 1 mm。

## 为什么会累积

从一根 6000 mm 的型材上切三件 2000 mm 的工件，你可能以为刚好放下、余量 0 mm。按 3 mm 锯缝算，你需要 6018 mm——最后一件短 18 mm。这是手写下料清单失败的最常见原因。

## 板材上的锯缝是双向的

在板材上，锯缝同时影响纵切和横切，因此可用宽度和高度都会被削弱。板材切割计算器在每一个工件之间、横竖两个方向都预留锯缝。

## 实测你自己的锯缝

切一块废料，在几个位置量槽宽再取平均。靠山一侧有侧摆的锯片或钝刀，切出的缝会比标称宽。把实测值——而不是样本册上的值——填进锯缝字段。

## 结论

是否注意锯缝，决定方案是能用还是要返工。NestingCalc 的两款计算器都把锯缝当作一级输入——请用好它。

[打开线性切割计算器](https://nestingcalc.com/cn/linear-cutting-calculator/) [打开板材切割计算器](https://nestingcalc.com/cn/sheet-cutting-calculator/)

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