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Wooden Marking Gauge with a Wedge-Locked Headstock
A marking gauge scribes a line parallel to an edge: a square beam slides through a headstock, a steel pin near the end of the beam scratches the line, and a wedge locks the headstock at the distance you set. Make it from a hardwood strip and a filed steel pin.
The picture: a small walnut marking gauge; this one locks with a brass screw and marks with a blade, where ours uses a wedge and a pin.
中级
An afternoon
说明
1
1
Beam and headstock
Beam and headstock
Plane a square beam about 20 mm thick and 200 mm long. Cut a block for the headstock and chop a square hole through it so the beam slides snugly.
此步骤所需材料：
硬木条2 个所需工具：
手锯
手刨
固定角尺
木工凿子套装2
2
Wedge slot
Wedge slot
Chop a tapered slot across the headstock that meets the beam hole, and plane a matching wedge about 1 in 12 (our taper).
所需工具：
木工凿子套装手刨3
3
The pin
The pin
Drill a small hole near the end of the beam, drive in a short length of steel rod, and file its tip to a fine point standing about 1 mm out.
此步骤所需材料：
低碳钢圆棒0.05 m所需工具：
手摇钻
钢锯
金属锉4
4
Check and oil
Check and oil
Set it, run it along a straight edge, and check that the line is parallel at both ends. Oil the wood.
此步骤所需材料：
亚麻籽油0.02 升所需工具：
固定角尺5
5
Why the wedge holds
Why the wedge holds
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