IṢẸ́ ỌNÀ
ẸWÀ ÀTI ÌLERA
IṢẸ́ ỌWỌ́
ÀṢÀ ÀTI ÌTÀN
ÌṢERÉ
ÀYÍKÁ
OÚNJẸ ÀTI OHUN MÍMU
REVERSE ENGINEERING
SÁYẸ́ǸSÌ
ERÉ ÌDÁRAYÁ
ÌMỌ̀-Ẹ̀RỌ
ÀWỌN OHUN WÍWỌ̀
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.
Àárín
Two days
Ìlànà
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.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Igi líle (oaki, mápù, bíìṣì)1 ẹyọÀwọn irinṣẹ́ tí a nílò:
Àáké
Okùn Ìdíwọ̀n2
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.
Àwọn irinṣẹ́ tí a nílò:
Okùn ìsàmì ẹfunÀáké
Àáké ìṣèkó3
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.
Àwọn irinṣẹ́ tí a nílò:
Ọ̀bẹ Ìfàsẹ́yìn
Òòlù Igi4
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.
Àwọn irinṣẹ́ tí a nílò:
Ohun ìlù ilẹ̀Okùn Ìdíwọ̀n5
5
Lever ratio
Lever ratio
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