Internal Corners of a Cut-out with No Radius If you require a smaller radius on internal corners this must be clearly indicated in the Mechanical Layer, like the above for the PCB contour. This means that any internal corner will have a minimum radius of 1.00mm. The cut-out is normally milled using a Ø 2.00mm tool. It is best practice to create the outline using a small line for example 0.50mm wide – where the centre of the line represents the exact outline of the cut-out.Ĭut-outs must be a closed polygon, that starts and finishes at the same point. All the relevant dimensions and any specific tolerances are included preferably from a Reference Hole inside the PCB contour. These should be drawn accurately in the Mechanical Layer to represent the exact 1:1 size and shape of the cut-out. Slot – a cut-out of a constant width opening that is equal to the diameter of a round cutting bit and is defined as a single movement from start to end point.ĭrill – a circular hole that can be created using a round drill bit. It is best practice to create the outline using a small line for example 0.50mm wide – where the centre of the line represents the exact outline of the board.Ĭut-outs and slots can be completely inside the PCB contour or overlap it to make a more complex contour, the definition of each is below.Ĭut-out – any shape of opening that cannot be created by a drill. The Mechanical layer is (as for all layers) viewed from top to bottom through your PCB.DO NOT mirror or rotate the Mechanical layer.DO NOT scale your Mechanical layer, it should be 1:1 and reflect the exact dimensions of the PCB.When no dimensions are given, we will always take the centre of the contour lines to be the exact outline of the board, regardless of their thickness.DO NOT provide actual milling layers for PCB contour or internal cut-outs or slots as it is production dependent as we cannot use this data if provided.PTH and NPTH indication (if these are not supplied in separate drill data file).

The exact position and size of any internal slots or cut-outs, ideally with dimensions (mm or inch).The exact PCB contour (profile), ideally with dimensions (mm or inch).It must contain at least the following information: The Mechanical Layer should contain the mechanical information necessary to produce your PCB. Generating the Mechanical Layer Data file

Mechanical layer altium