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SANAA
UREMBO NA USTAWI
UJANJA
UTAMADUNI NA HISTORIA
BURUDANI
MAZINGIRA
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SAYANSI
MICHEZO
TEKNOLOJIA
VAZI
English
Micrometer Gauge: Pratt, 1878
A micrometer clamps the work between a fixed abutment and the tip of a fine screw. Both faces must be smooth and very hard, but tempering a finished screw changes it: the heat expands the metal, part of the expansion stays, and the cooling is uneven, so a screw that was accurate before hardening often is not after. George M. Pratt of Middletown, Connecticut, patented the remedy in 1878, US 202,866: leave the screw untempered and give it a socket at its end for a separate tip of steel tempered as hard as possible. A worn tip is simply replaced. He also shaped the horseshoe frame widest at the middle and tapering towards the ends, so it is stiff where it most needs to resist springing but lighter overall.
Juu
Workshop process
Maagizo
1
1
Frame
Frame
Make the horseshoe frame widest at the middle of the bow and tapering towards both ends, where the abutment and the screw bearings sit.
Vifaa kwa hatua hii:
Fremu ya kiatu-farasi ya mikromita1 kipande2
2
Screw
Screw
Cut the micrometer screw in steel and leave it untempered. Form a socket in its measuring end.
Vifaa kwa hatua hii:
Skrubu ya mikromita1 kipandeZana zinazohitajika:
Kereza ya Chuma3
3
Tip
Tip
Make the tip separately, with a shank that fits the socket closely, and temper it as hard as possible.
Vifaa kwa hatua hii:
Ncha ya mikromita iliyogandishwa1 kipandeZana zinazohitajika:
Tanuri ya kutibu kwa joto4
4
Assemble
Assemble
Insert the tip's shank into the screw's socket. Fit the adjusting abutment screw in the other end of the frame; the work is measured between its flat face and the tip.
Vifaa kwa hatua hii:
Skrubu ya fuawe inayorekebishwa1 kipandeVifaa
4- 1 kipandeKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
Zana Zinazohitajika
2- Kishikilia Nafasi
- Kishikilia Nafasi
Mchoro huu unatengeneza
Blueprint zinazohusiana
Blueprint hizi zinashiriki maarifa — mbinu, vifaa au kanuni
CC0 Umma Wote
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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.