Operation
28
02.01|FDB 150, 300, 340, 660, 900, 1040 |en
tional robot path speed, the burr is deflected but contacts the
work surface. Once the robot path has been confirmed, the com-
pliance force of the burr should be adjusted
, in
order to achieve a correct depth of cut.
Cutter Operation and Burr Selection
The FDB will perform best in “climb milling”. This refers to a cutter
whose directions of traverse and cutter rotation are the same. In
the case of the FDB, the cutter rotation is clockwise when viewed
from above. Climb milling would therefore involve clockwise mo-
tion around the outside of a part being deburred. In climb milling,
the heaviest cut is made as the tool enters the workpiece and the
chip becomes narrower as the cut is completed. In “conventional
milling”, the cutter travels in a direction opposite of cutter rota-
tion. This may aid in cutter stability for some operations, however,
the cutting edge of the tool is subjected to higher friction and cut-
ting forces. Tool wear is accelerated in this mode and surface finish
quality will generally be reduced. When “conventional milling”, ex-
tra care must be taken around corners. This poses a potential haz-
ard where the cutting force can deflect the burr causing the burr
to break as the machine/robot continues along its path.
The selection of a cutting tool is highly dependent upon the part
material and geometry, and the depth of cut. It is not practical to
present all the possibilities in this document. Please see
of this document for a short list of burrs and suitable ap-
plications. It is worth mentioning here that a specific family of
burrs is available for working with die cast alloys, aluminum, and
plastics. These cutters have fewer teeth and increased relief to
minimize chip loading.
Plastics represent the most difficult deburring challenge due to the
phenomenon of chip re-welding. In this process, if the cutter is dull
or the feeds and speeds are not correct for the material removed,
chip will melt and weld to the cutter or the work piece. This can
quickly load a cutter and produce unacceptable results. In general,
the traverse or feed rate of the FDB will be higher for plastics to
minimize this behavior. This results in larger cuts, which more ef-
fectively remove heat from the cutter-tool interface.
6.5
