All tooling maintenance should be performed in a clean environment. Any foreign matter on any of the tooling will detract from the tool accuracy.
- When removing cutters from the head, it is important to keep each stack of cutters, washers and bolts together. Attach a label to each stack, identifying which bolt it was removed from. This will process will aid in re-balancing the stacks prior to installation.
- Soak the cutter stacks in BLADE CLEAN or a non-corrosive cleaner to remove pitch or sawdust from the knives. To remove heavy pitch deposits, a medium grade Scotch Brite pad and WD-40 can be used. Never use abrasive products to clean cutters or heads. Never sandblast to clean. Damage to the head and cutters will result.
- After soaking, rinse cutter stacks with warm water and inspect. Check to see that compacted sawdust in the gullet area of the cutters has been removed. Blow-dry with compressed air. Any remaining pitch or sawdust will have an effect on the balancing procedure.
- Inspect all cutters, washers and nuts for damage:
Cutters: Inspect for pockmarks and galling on the index surface and bolt holes. Cutters with galling on the index surface or bolt hole should be considered for replacement, as the accuracy of the index surface and hole has been compromised. Replace any broken cutters.
Nuts and Washers: Inspect for galling on the top and bottom mating surfaces and inside of the threads. Galling occurs from torquing the retaining nuts without use of anti-seize compound. Once the nuts/washers have been galled, they can no longer be accurately torqued and must be replaced. If the threads on the nut are damaged the threads on the bolt will likely also be damaged.
- Stone both index surfaces of each cutter with a fine-grit India stone and light oil (WD-40). Use a circular motion to remove any pockmarks (created by debris trapped between cutters when previously torqued) or burrs that may have resulted from previous posting or cleaning of the cutters.
- Clean the inside bore of the hole with a Q-Tip (cotton swab). Remove any oil with a shop towel and Isopropyl alcohol. It is imperative that there is no residual matter inside the bore of the cutter or on the index. The cutters are designed with very tight tolerances and impurities will affect the set-up and performance of the head.
- Place cutters on a clean surface and cover with a clean shop towel.
Cutter stacks are now ready for balancing.