SANAA
UREMBO NA USTAWI
UJANJA
UTAMADUNI NA HISTORIA
BURUDANI
MAZINGIRA
CHAKULA NA VINYWAJI
UHANDISI WA KINYUME
SAYANSI
MICHEZO
TEKNOLOJIA
VAZI
Magnifying Glass from a Hand-Ground Lens
A magnifying glass is a convex lens in a frame with a handle. A typical one has a focal length of 25 cm, an optical power of 4 dioptres, and is sold as "2×": its magnifying power is 0.25 m × 4 + 1 = 2 for an eye whose near point is 25 cm. Here the lens is ground plano-convex from crown glass (refractive index about 1.52). For a plano-convex lens the focal length is R / (n − 1), so a 25 cm focal length needs a curve of radius about 13 cm. The lens is then set in a turned wooden ring with a handle; those sizes are ours.
Juu
2–3 days
Maagizo
1
1
Grind the lens
Grind the lens
Following the lens-grinding blueprint, grind one face of a glass disc to a spherical curve of about 13 cm radius, working down through the grits, then polish it clear with cerium oxide on a pitch lap. Leave the other face flat.
Vifaa kwa hatua hii:
Bamba la kioo1 kipande
Gundi ya Lami ya Msonobari100 gZana zinazohitajika:
Rula
Chembechembe za kabidi ya silikoni
Kisafishi cha oksidi ya seriamu2
2
Check the focus
Check the focus
Hold the lens in sunlight and move a card behind it until the spot is smallest; the distance from lens to card is the focal length and should be close to 25 cm. Do not look at the Sun through it.
Zana zinazohitajika:
Rula3
3
Turn the frame
Turn the frame
Turn a ring from a hardwood blank with a groove on the inside just wider than the lens edge, and part it off.
Vifaa kwa hatua hii:
Kipande cha mbao ngumu1 kipandeZana zinazohitajika:
Kerezo cha mbao
Patasi ya Bapa-Pinda
Patasi ya kukata kazi4
4
Turn the handle
Turn the handle
Turn a handle from a hardwood dowel and fix it into a hole drilled in the ring.
Vifaa kwa hatua hii:
Vijiti vya mbao ngumu1 kipande
Epoksi ya Sehemu Mbili5 mlZana zinazohitajika:
Kerezo cha mbao5
5
Set the lens
Set the lens
Saw the ring through at the handle, spring the lens into the groove, glue the cut closed and wax the wood.
Vifaa kwa hatua hii:
Nta ya Nyuki10 gVifaa
6- 1 kipandeKishikilia Nafasi
- Kishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- Kishikilia Nafasi
- 10 gKishikilia Nafasi
Zana Zinazohitajika
6- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
Mchoro huu unatengeneza
Blueprint zinazohusiana
Blueprint hizi zinashiriki maarifa — mbinu, vifaa au kanuni
CC0 Umma Wote
Mchoro huu umetolewa chini ya CC0. Uko huru kunakili, kubadilisha, kusambaza, na kutumia kazi hii kwa madhumuni yoyote, bila kuomba ruhusa.
Saidia Mtengenezaji kwa kununua bidhaa kupitia Mchoro wao ambapo wanapata Kamisheni ya Mtengenezaji iliyowekwa na Wachuuzi, au unda marudio mapya ya Mchoro huu na uiunganishe kama kiungo katika Mchoro wako kuchangia mapato.