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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.
Abantado
Workshop process
Mga Tagubilin
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.
Mga materyales para sa hakbang na ito:
Hugis-sapatos-kabayong frame ng micrometer1 piraso2
2
Screw
Screw
Cut the micrometer screw in steel and leave it untempered. Form a socket in its measuring end.
Mga materyales para sa hakbang na ito:
Turnilyo ng micrometer1 pirasoMga kailangang kasangkapan:
Torno para sa Metal3
3
Tip
Tip
Make the tip separately, with a shank that fits the socket closely, and temper it as hard as possible.
Mga materyales para sa hakbang na ito:
Pinatigas na dulo ng micrometer1 pirasoMga kailangang kasangkapan:
Hurno para sa heat treatment4
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.
Mga materyales para sa hakbang na ito:
Naaayos na turnilyong anvil1 pirasoMga Materyales
4- Placeholder
- 1 pirasoPlaceholder
- 1 pirasoPlaceholder
- 1 pirasoPlaceholder
Mga Kinakailangang Kasangkapan
2- Placeholder
- Placeholder
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