Sawfiler
A saw filer or saw doctor is a person who maintains and repairs saws in a saw mill. A saw filer's work area in the mill is called the filing room.
Saws used in timber mills are very large and expensive. They need careful maintenance for safe operation. Repair of damaged saws requires a high degree of skill. It takes many years of full-time saw filing to become proficient in the trade.
Bandsaw filing
Bandsaws in timber mills range in size from about (4" x 22ga x 10') to (16" x 11ga x 62') and can use any of the three main different saw band types:
Single-cut saws have, as the name implies, teeth on one side, allowing for cutting in one direction only.
Double-cut saws have teeth on both sides. These types are designed for machinery that allows the log or work piece to be cut from either the front or the back direction of travel.
"Sliver tooth" saws have teeth on both sides but they have different profiles. The (usual) front side have teeth with a regular style tooth. The back of these saws have a longer style. The log is cut in a forward direction as with a single-cut but as the log returns, the saw de-burrs the cut (path where the saw passes) allowing for a cleaner finish. They are run for 4 to 24 hours then sent to the saw filer for maintenance.