Kerf Compensation from FastCAM or FastNEST

Here we will cover how to handle Kerf Compensation with FastCAM / FastNEST. If you are unfamiliar with Kerf, or its importance, here is a quick guide from ESAB:

PLEASE NOTE: The two modes described below are mutually exclusive. You should only use 1 at a time, otherwise you will be doubling up on Kerf.

For Kerf Compensation, there are two places you can handle Kerf, both from the FastPATH settings. To get to your FastPATH Settings

In FastCAM click here:

In FastNEST click File Cut List > Set Pierce

Controller Adjusted Kerf

The default, and recommended, option is to let the controller handle your Kerf Compensation. As it allows you to control the Kerf on the Controller, and a single program can then be used for differing materials and thicknesses. FastCAM Will not adjust the geometry of the part, and will instead output Kerf Left / Right / None commands as required (G41/G42/G40).

To set this, make sure the KERF setting on your cutting process is set to LEFT or RIGHT (Most will use Kerf LEFT however)

Geometry Adjusted Kerf

This method requires you know the Kerf compensation values for your torch, as when you output it will offset the geometry of the part for the given kerf value. This method is required for some specific FastNEST cutting modes, such as common cut nest. Here is a sample of what it should look like:

If you have any questions, feel free to ask!

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