Lumber and sawmill equipment is designed for the lumber industry and used in sawmills, timber, and forestry applications. Primary breakdown equipment is used to produce cants and slabs. Secondary breakdown equipment is used to produce cuts and provide resawing capabilities. There are many different types of lumber and sawmill equipment. Examples include: bandmills, bandsaws, barkers, canters, chippers, choppers, edgers, gangsaws, hoists, kilns, lifts, moulders, planers, resaws, ripsaws, scraggs, slabbers, stackers, and unscramblers. Products such as bark conveyors, cant landing tables, floor chains, hammer hogs, log conveyors, sorters and trimmers are also commonly available. Some suppliers of lumber and sawmill equipment provide filing room machinery and rolling stock. Others sell or lease used equipment and offer products such as bandsaw sharpeners, circular saw sharpeners, dual-side grinders, guide dressers, and log decks. Lumber and sawmill equipment for primary breakdown includes: chipper-canters, twin bandsaws, scraggs, double-length infeed (DLI) stations, small log processors, end-dogging equipment, and band-saw carriages. With large log lines, chipper-canters are closely coupled with twin bandsaws for the production of two-sided cants. Small log lines often use a four-sided canter instead of an integrated chipper-canter unit. Twin bandsaws are relatively expensive and require significant amounts of maintenance. Scraggs are older systems with heavy kerf and weak guiding. DLI stations combine a chipping canter with twin or quad saws. Small log processors eliminate the need for multiple scanning, positioning, processing, and disposal activities. End-dogging equipment holds logs in place to minimize unwanted movement. Band-saw carriages are lumber and sawmill equipment that allows the recovery of higher lumber grades from large logs, but require multiple passes. Lumber and sawmill equipment for secondary breakdown includes: single, twin and quad vertical bandmill-linebar resaws; single and twin horizontal bandmill resaws; slant bandmill linebar resaws; gangs with vertical arbor circular saws; and gangs with horizontal arbor circular saws. For straight cants, a vertical bandmill-linebar resaw provides accurate resawing capabilities. Band-mill linebar systems may have as many as four close-coupled bandmills to produce multiple cuts in one pass. Horizontal bandmill resaws are designed to cut wide slabs which are fed flat-side down on a horizontal conveyor. Vertical or slant-band resaws may feature rotating feed systems which allow operators to circulate the cants continuously. Circular gangsaws have a cluster circular blades running on a common arbor. Other types of lumber and sawmill equipment for secondary breakdown activities are also commonly available.