Eagle PCB v3
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Inflate Milling Path By
mm

Inflate your milling path by half the diameter of your endmill. If you are using a 0.5mm endmill, then enter 0.25mm above. If you are using a V-bit then figure out the diameter based on how deep you'll mill. Copper on FR4 is usually 1 oz = 0.035mm, 2 oz = 0.07mm, 3 oz = 0.105mm thick. If you use ChiliPeppr's Auto-Level, you could safely mill with depths of 1 oz = 0.07mm, 2 oz = 0.1mm (most popular), 3 oz = 0.15mm. That means a V-bit with a 45° angle at 0.1mm depth will have a diameter of roughly 0.1mm. So, you could use 0.05mm above, however, in practice it would be best to inflate further than that to be safe.

Advanced Inflating
mm
mm
mm
Show Actual Endmill Path
mm

This value does not affect how your Gcode is created, rather it just lets you visualize where your endmill will travel. The size you place here is simulated in the 3D viewer along the inflated milling path you specified above. It is common to mill PCB's with an endmill larger than what should exactly be used at the cost of cutting off more copper from signals/vias/pads. To ensure you aren't causing any actual problems, look at where the cyan line goes to understand.

Toggle Signal/Pad/Via Popup Windows

This allows you to hide the popup windows as you mouse around with the 3D viewer. They can sometimes get in the way when iterating the best endmill sizes and inflate by values.

Traces

Depth of Milling Traces
mm

If you use ChiliPeppr's Auto-Level, you should be able to achieve copper removal with -0.1mm depth on 2oz copper. Or refer to the following depths:

  • 1 oz copper : -0.07mm depth (0.035mm is typical thickness)
  • 2 oz copper : -0.1mm depth (Most popular. 0.07mm is typical thickness)
  • 3 oz copper : -0.15mm depth (0.105mm is typical thickness)

Feedrate for Milling Traces
mm/min

The feedrate to use for milling your traces. Default is 80mm/min.

Feedrate for Plunge into Copper
mm/min

The feedrate to use when the Z is descending into your copper. Default is 30mm/min.

Clearance Height

Clearance for Z Axis Moves
mm

The clearance height to move the Z axis to for moving from trace to trace without hitting anything. Default is 1mm, but if you are using the Auto-Level you could get away with 0.5mm.

Mark holes for drilling

This will mark holes for drill. The first endmill (V-Bit or other) will touch the middle of a hole to center the mill, to prevent "dancing drill" effect.

Depth for Drilling Holes
mm

The depth for drilling your holes will typically match your board depth.

Maximum hole diameter to drill
mm

The maximum diameter to drill. If you have bigger holes then they want to mill. I.e. You have a PCb with a lot of 1mm holes and on every corner a hole with 3.6mm. You want the small holes drill and the bigger ones to mill. Please remember, you need a endmill for dimension with a diameter smaller as this value!

Feedrate for Drill
mm/min

The Feedrate for Drilling.

Board Dimensions

Diameter of tool for cutting dimension
mm

Please input the diameter of your endmill for cutting the dimension. If you want to mill some holes, then the tool diameter has to be smaller than the smallest hole.

Depth of Cutting Out Dimensions (Board Depth)
mm

Typical FR4 thickness is 1.7mm.

Step Down for Cutting Dimensions
mm

Passes 4 Last Pass -0.2mm

The amount to step down in the Z axis for each pass of cutting out your board dimensions. Default value is -0.5mm.

Feedrate for Cutting Dimensions
mm/min

The feedrate used for cutting out your dimensions. Default value is 100mm/min.

Generated Gcode