being welded to the arbor shaft when the
hydro pressure drops during operation.
Outboard bearings are the next
Again, a preventable expense.
in line for most failures. On most
machines, the assembly is designed
to “float” in the mounting plate so an
axial spindle adjustment does not put
any unnecessary preload (side load) on
the bearing itself. For some unknown
reason, some maintenance person-
nel or operators feel these should be
rock solid and tighten them down in
the housing, so they can’t move. If the
hydro-sleeve is pressurized when the
operator makes an axial adjustment, it
won’t take long for that bearing to fail.
Outboard bearings and broken
shafts. This is a common failure,
predominately for bottom spindles, but
any location can fail if the alignment is
not perfect. On most machines the outboard bearing plate is a slotted assembly on the bottom spindles, meaning
the operator must break loose the plate
before making a radial adjustment, so
it can float with the spindle. Too many
times the operator forgets or disregards
the basic instructions and adjusts the
spindle without doing this. The shaft is
going to break right at the shoulder of
the spindle housing.
HSK moulder spindles. There is
a myriad of things that can go wrong
on these. I don’t mean to discredit
them, HSK is an excellent tool holding
interface used in almost all of the most
critical of material removal machines.
Drawbar spring tension is what
holds the tool in. If the spring tension
is not within specifications, it must be
adjusted. This is for safety and cut quality. And while on the subject of spring
tension, avoid leaving the tooling in the
machine overnight. When the tooling
is loaded in the spindle, the springs are
compressed. The longer they are compressed, the shorter their life.
HSK clamp group adjustment. This
is also a key area not to be overlooked.
The clamp group (the segmented as-
sembly inside the end of the spindle)
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