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MICHEZO
TEKNOLOJIA
VAZI
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.
Kati
Two days
Maagizo
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.
Vifaa kwa hatua hii:
Magogo ya mbao ngumu (mwaloni, mepo, mbeech)1 kipandeZana zinazohitajika:
Shoka
Tepi ya kupimia2
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.
Zana zinazohitajika:
Kamba ya kupiga mstariShoka
Shoka la kuchonga bakuli3
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.
Zana zinazohitajika:
Kisu cha Kuvuta
Nyundo ya mbao4
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.
Zana zinazohitajika:
KekeeTepi ya kupimia5
5
Lever ratio
Lever ratio
Inapakia daftari la Jupyter…
Vifaa
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Zana Zinazohitajika
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