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
Wooden Ruler, Graduated with a Caliper
A ruler is only as good as its marks. Here every mark is measured from the ruler's own end with a digital caliper, so errors do not add up as they would by stepping off one centimetre after another. A 150 mm caliper marks the first half; the second half is measured from the far end. Straight-grained hardwood stays straight.
Olùbẹ̀rẹ̀
2 hours
Ìlànà
1
1
Plane the blank
Plane the blank
Plane a straight-grained hardwood strip to about 310 x 30 x 5 mm, with one long edge dead straight and the ends square.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Tẹ́ẹ́rẹ́ igi líle1 ẹyọÀwọn irinṣẹ́ tí a nílò:
Ohun ìfá kékeré
Etí tààrà
Igun-òsùwọ̀n tí ó dúró
Ìdìmú Tábìlì2
2
Mark from the left end
Mark from the left end
Set the caliper to each length from 0 to 150 mm and, with its fixed jaw on the ruler's left end, nick the edge at the moving jaw with the marking knife.
Àwọn irinṣẹ́ tí a nílò:
Òṣùwọ̀n Kálípà Díjítà Ìnṣì 6
Ọ̀bẹ ìsàmì3
3
Mark from the right end
Mark from the right end
Cut the blank to exactly 300 mm, then mark 150 to 300 by measuring from the right end in the same way.
Àwọn irinṣẹ́ tí a nílò:
Òṣùwọ̀n Kálípà Díjítà Ìnṣì 6Ọ̀bẹ ìsàmìIgun-òsùwọ̀n tí ó dúró4
4
Knife the lines
Knife the lines
Square each nick across with the try square and knife: short lines for mm, medium for 5, long for 10.
Àwọn irinṣẹ́ tí a nílò:
Igun-òsùwọ̀n tí ó dúróỌ̀bẹ ìsàmì5
5
Finish
Finish
Sand lightly and wipe on linseed oil; the oil darkens the knife lines so they read clearly.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Òróró Ọ̀gbọ̀10 mlÀwọn irinṣẹ́ tí a nílò:
Bébà ìpọ́n6
6
Check it
Check it
Measure across several marks with the caliper; note the largest error on the back.
Àwọn irinṣẹ́ tí a nílò:
Òṣùwọ̀n Kálípà Díjítà Ìnṣì 6Àwọn ohun-èlò
2- 1 ẹyọÀyè
- 10 mlÀyè
Ìtọ́nisọ́nà yìí ń ṣe
CC0 Àgbègbè Gbogbogbò
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