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UREMBO NA USTAWI
UJANJA
UTAMADUNI NA HISTORIA
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MICHEZO
TEKNOLOJIA
VAZI
Digital Tachometer: Hand-Held Contact Type That Holds Its Reading (Sugiyama, Shimpo, US 4,000,465, 1976)
A hand-held digital tachometer. You press the contact head on its shaft against the end of a turning shaft and push the thumb button; a slotted disk inside chops a light beam into pulses, and the pulses counted in a fixed time, set by a quartz clock, appear in the window as the speed. A latch holds the reading after you take the tachometer away, so you can read it even where you could not see the window while measuring.
Result: a contact tachometer that shows revolutions per unit time and keeps the last reading.
Source: Y. Sugiyama (Shimpo Kogyo), US 4,000,465 (1976). Unknown: the number of holes, the clock, the gate time and the circuit details. Picture: the patent drawing.
Juu
Unknown
Maagizo
1
1
Make the housing and measuring shaft
Make the housing and measuring shaft
Make a cylindrical housing to hold in one hand, with a window in its side for the reading and a push button for the power switch where the thumb falls. Run a measuring shaft out of the front end in bearings and fit a contact head on its tip to press against the shaft being measured. Not given: materials, sizes. Ours: aluminium tube, a ball bearing.
Vifaa kwa hatua hii:
Bomba la alumini1 housing
Metali isiyojulikana1 measuring shaft
Fani ya Mipira1 kipande
Nyenzo isiyojulikana1 contact headZana zinazohitajika:
Kereza ya Chuma
Kekee cha mkono
Vipimo visivyojulikana2
2
Make the pulse generator
Make the pulse generator
Fix a disk on the measuring shaft with a ring of small holes evenly spaced near its edge. Put a light source on one side of the disk and a photodetector on the other: each hole passing makes one pulse. Shape and amplify the pulses. Not given: the number of holes. Ours: an LED and a photodiode.
Vifaa kwa hatua hii:
Nyenzo isiyojulikana1 slotted disk
Mchanganyiko wa taa za LED1 light source
Fotodiodi (BPW34)1 photodetector
Ukinzani1 setiZana zinazohitajika:
Kekee cha mkono3
3
Build the counting circuit
Build the counting circuit
Divide a quartz oscillator's clock down to gate pulses one unit of time long. Pass the measurement pulses through an AND gate during each gate pulse into a counter. At the start of each gate pulse a reset pulse clears the counter. After the gate pulse ends, the first measurement pulse that arrives triggers a latch pulse that loads the new count into the display. If the head has been taken off the shaft, no pulse arrives, no latch pulse is made, and the display keeps the last reading until the next measurement or until the power is switched off. Not given: the clock frequency and gate time. Ours: logic ICs and a seven-segment display.
Vifaa kwa hatua hii:
Bamba la mzunguko lililochapishwa1 kipande
Kioo cha kwatsi1 kipande
Mchanganyiko wa IC za mantiki1 divider, AND gate, counter, latch, reset
Kiendeshi cha Kionyesho cha Sehemu Saba1 kipande
Kionyesho cha Tarakimu Nne cha Sehemu Saba1 kipande
Waya wa Lehemu1 as neededZana zinazohitajika:
Chuma cha kulehemia4
4
Power it and measure
Power it and measure
Fit the battery and the thumb button as the power switch. Press the contact head against the end of the turning shaft so it turns with it, push the button, and read the revolutions in the window, now or after you take the tachometer away.
Vifaa kwa hatua hii:
Betri1 kipande
Kitufe cha kubonyeza1 kipandeZana zinazohitajika:
Chuma cha kulehemiaVifaa
15- 1 housingKishikilia Nafasi
- 1 measuring shaftKishikilia Nafasi
- Kishikilia Nafasi
- 1 slotted diskKishikilia Nafasi
- 1 light sourceKishikilia Nafasi
- 1 photodetectorKishikilia Nafasi
- 1 setiKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- 1 divider, AND gate, counter, latch, resetKishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- 1 as neededKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- Kishikilia Nafasi
Zana Zinazohitajika
4- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- 2 vendors sell this, none ship to you yetKishikilia Nafasi
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