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Twybil
A twybil is a hand tool used for green woodworking.〔 It is used for chopping out mortises when timber framing, or making smaller pieces such as gates. It combines chopping and levering functions in a single tool.
The appearance of a twybil is that of a T-shaped double-edged axe with unusually long blades and a very short handle. This appearance is deceptive, as they are actually derived from a large double-ended chisel with a side handle added for better control. The geometry of a twybil, particularly the long straight blades, makes it unworkable as an axe. Unfortunately many old examples have been damaged by such misuse.
Twybils always have two working ends and these are always different. The first is an axe-like blade, with the edge arranged parallel to the handle. The second edge is crossways, as for an adze. This is used for prying and levering rather than cutting.
== Use ==
The correct use of a twybil is highly specialized, that of rapidly clearing out mortises. Mortises are rectangular holes used to take a tenon for several forms of joint, most obviously the common mortise and tenon joint. Mortises are always cut so that their long axis is along the grain of the wood. Traditionally these were first cut by drilling with a brace and bit to mark out each end, then the twybil used to break out the wood between them. The axe edge is used to split the intervening timber away from the sides of the mortise, then the other end to lever out the split block.〔 Their short handle allows them to be easily flipped end-for-end, making for quick working as each blade is used alternately. This is quicker to use than swapping between a chisel and a separate lever, safer than using a carefully sharpened chisel edge for levering.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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