Leica Biosystems SP9000 - Manual (Page 13)

13 Leica SP 9000 – Automatic knife sharpener
For the first resharpening of a new Leica knife or one that has been
factory reconditioned by Leica, the honing process must begin
with coarse honing. This is necessary in order to develop the sec-
ond facet as is explained in the section on ,,Factory Recondition-
ing”.
Again, please note that microscopic examination of the knife before and
after honing is the only proven method of determining how much honing
time is required and when coarse honing has been completed.
In coarse honing, it is important to remember that the sharpening process
begins at the back of the cutting facet and gradually moves toward the front
edge of the knife. The highly efficient honing process is dependent on four
factors:
1. Backward and forward movement of the knife arm to which the knife and
holder are attached.
2. Automatic turnover of the knife at the end of each cycle for equal honing
of both knife sides.
3. A solenoid applies approximately 4 pounds of pressure to the knife when
the coarse button is pushed.
4. An undulating motion of the honing plate is coupled with its back and forth
movement that moves contrary to the knife arm.
Before starting any procedure, be certain that the ,,OFF“- but-
ton is depressed.
5.1 . Inspect for presence and size of nicks
Clean knife edge with solvent such asxylene. Place the knife on the micro-
scope and inspect the edge for presence and size of nicks. Also, note the
other surface characteristics of the cutting facet to more easily recognize
the “changes” that will take place during coarse honing.
5. Coarse honing procedure