PCD-Customs-Tools

Fig. 1
This is also an advantage for the wear and tear of the cutting edges, as the milling
cutter does not always have to enter through the unmilled edge of the part.
Important to know: If you can guarantee optimal clamping and absolutely backlashfree
guidance, you will always achieve better surfaces with down-cut milling than with
up-cut milling. The reason for this is that with down-cut milling the cutter touches the
cutting edge when the chip is cut, at this point the cutting forces are lowest. With upcut
milling you have the highest cutting forces at the entry of the cutting edge, which
can lead to chatter marks.
With flush milling, this is often not an issue because only a few 0.1mm are milled
flush.
An important topic for professionals: While with hard metal flush milling cutters not
only the sharpness of the cutting tooth is lost over time, the diameter of the milling
cutter is also reduced.
In the case of diamond routers with a guide ring, the cutting diameter is significantly
longer constant due to the hard diamond cutting material compared to hard metal
router bits with a guide ring.