LPKF ProtoMat 93s Manual
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7 Milling and drilling with the LPKF ProtoMat 93s
7.1 Securing the PCB on the machine bed
Make 3.0 mm alignment holes in the base material and backing material spaced
the same distance as the alignment pins. This can also be done with any upright
drilling machine. Take into consideration that the diameter decreases during
galvanic through-plating process so do not plate these holes.
Move the mill/drill head to the PAUSE position. Insert alignment pins in the front
and rear two-pin strips but, even so, check that the front two-pin strip is pushed
forwards against the reference pin in the machine groove.
Position the pre-drilled base material and drilling base over the alignment pins.
The format of the base material should be selected in a way that the two-pin slides
do not have to be moved by more than 10 mm, as otherwise the two-pin system
precision decreases.
Now secure the base material in position with drafting tape (masking tape is not
recommended because it leaves a residue) on all sides. This prevents the corners
of the PCB turning upwards.