Specifications

Stages in milling and drilling
54 ProtoMat 95s/II
7.6 Contour milling in circuit base material
fig. 40: Contour Cutters
The traverse speed must be reduced for contour milling.
This may vary from material to material.
Use only contour Cutters (38 mm long) designed specifically for this
purpose: preferably with a 1 mm or 2 mm diameter.
The 1 mm contour Cutter should only be used for internal holes (smaller
internal radius). It breaks relatively easily so set the feed rate to the
minimum setting.
The 2 mm contour Cutter is far more robust and is to be recommended
for milling external contours.
Caution! All speeds and feed rates prescribed in BoardMaster are
for FR4 material. You should begin at a lower feed rate when
working with other materials.
Danger! Please note that some materials, including FR4, may
produce carcinogenic dusts (from glass fibres).
You should therefore always work with the vacuum system
switched on.
Always use a microfilter.
Some materials (such as Teflon) may produce lethal gases during
cutting.
7.7 Milling wide isolation channels and rubouts
fig. 41: Double-edged cutter (end-
mill)
Wide isolation channels and rubout areas (the removal of areas of
residual copper) can be created using 36 mm long double-edged
cutters.
Various diameters are available (0.8 mm, 1 mm, 2 mm, 3 mm)
depending on the size of the residual copper area to be removed.
The milling depth must be set such that only minimal burring results
when the copper is removed. The 3 mm double-edged cutter is
particularly well suited to milling very wide isolation channels (VDE
codes of practice).