Specifications

48
Manual
ProtoMat 95s/II
The milling depth must be set as large (deep) as possible in all cases. If only the extreme
milling cutter tip (<0.2 mm isolation) is used, the tool wears more quickly than with deeper
drilling.The LPKF Micro Cutters can be used to create even finer isolation channels but their
service life will be only approximately 20% of that of the LPKF Universal cutters mentioned
above.
Caution: Do not confuse Micro Cutters and Universal Cutters. It is only possible to distinguish
the two under a microscope.
A milling cutter which produces isolation channels with a rectangular cross-section has been
specially developed for RF technology.
approx. 0.2mm
approx. 0.075mm
Cu
approx. 0.1mm approx. 0.25mm
FR4
Milling passes using the LPKF Universal, Micro and RF Cutters
See the section entitled “Practical tips” for more information.
See the section entitled "Board material" for the advantages and disadvantages of various
materials.
After machining, the PCB has to be cleaned.
This can be done either in a brush machine or, alternatively, with a manual board cleaner
(LPKF accessories). In either case, the PCB must be rinsed thoroughly with water to remove
any copper dust produced by brushing.
After rinsing, the PCB must be dried thoroughly (air drier) and then protected against
oxidation by a soldering varnish.
6.6 Contour milling in circuit board material
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.
Caution
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.