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The process of holding down material for milling is called workholding or fixturing.

Many workholding methods use vises, clamps, or jigs. A jig is any prefabricated (made by you) holding mechanism that allows components to be repeatably milled from an identically sized piece of material.

Leveling so the surface of your material is perfectly parallel with the X and Y movement may be necessary for precise parts. The fixture shown has been shimmed. Some common methods are:

Mill a pocket.

Surface the entire X Y plane of the sacrificial board by using the mill

Shim your material or sacrificial board, moving the mill and bit around to reference from.

In the following steps, we'll go over two simple methods of securely mounting material to mill on BoXZY. These mounting methods apply when using a sacrificial board or material by itself.