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Trip-Hammer Helve: an Oak Beam Hewn and Bored for its Pivot
The helve is the wooden beam of a trip hammer: the head sits on one end, the cams lift the other, and it rocks on a pivot between. Hew it from a straight oak log, bore it for the pivot pin, and taper the head end to fit the hammer's eye.
The picture: our diagram, helve with pivot, head and cam.
中级
Two days
说明
1
1
Choose and cut the log
Choose and cut the log
Pick a straight, knot-free oak log a little longer than the helve and cut it to length.
此步骤所需材料：
硬木原木（栎、槭、山毛榉）1 个所需工具：
斧头
卷尺2
2
Hew it square
Hew it square
Snap chalk lines on the ends and along the log. Score to the lines with the axe and hew the faces flat with axe and adze.
所需工具：
弹线盒斧头
锛子3
3
Taper the head end
Taper the head end
Shave the head end with the drawknife to a slight taper that fits tight into the hammer head's eye.
所需工具：
双柄刮刀
木槌4
4
Bore the pivot
Bore the pivot
Bore a hole square through the beam for the pivot pin, about a third of the way from the tail.
所需工具：
螺旋钻卷尺5
5
Lever ratio
Lever ratio
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