Ubufatanye
UBUHANZI
UBWIZA N'UBUZIMA
UBUKORIKORI
UMUCO N'AMATEKA
IMYIDAGADURO
IBIDUKIKIJE
IBIRIBWA N'IBINYOBWA
UBWUBATSI BUSUBIRA INYUMA
UBUMENYI
SIPORO
IKORANABUHANGA
IBYAMBARWA
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.
Hejuru
Unknown
Amabwiriza
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.
Ibikoresho by'iyi ntambwe:
Umuyoboro wa alumini1 housing
Icyuma kitazwi1 measuring shaft
Bearing y'utubumbe1 igice
Ibikoresho bitazwi1 contact headIbikoresho bikenewe:
Imashini yo guhinguza icyuma
Igikoresho cyo gutobora gikoreshwa n'intoki
Ingano zitazwi2
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.
Ibikoresho by'iyi ntambwe:
Ibikoresho bitazwi1 slotted disk
Amatara ya LED anyuranye1 light source
Fotodiyodi (BPW34)1 photodetector
Ubukomezi bw'amashanyarazi1 ikirundoIbikoresho bikenewe:
Igikoresho cyo gutobora gikoreshwa n'intoki3
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.
Ibikoresho by'iyi ntambwe:
Ikibaho cy'umuzunguruko cyacapwe1 igice
Kirisitali ya kwartsi1 igice
Ibyuma bito bya logique binyuranye1 divider, AND gate, counter, latch, reset
Igikoresha icyerekana cy'ibice birindwi1 igice
Icyerekana cy'imibare ine gifite ibice birindwi1 igice
Urusinga rw'isudire1 as neededIbikoresho bikenewe:
Icyuma cyo gusudira4
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.
Ibikoresho by'iyi ntambwe:
Bateri1 igice
Buto ikandwa1 igiceIbikoresho bikenewe:
Icyuma cyo gusudiraIbikoresho
15- 1 housingUmwanya
- 1 measuring shaftUmwanya
- Umwanya
- 1 slotted diskUmwanya
- 1 light sourceUmwanya
- 1 photodetectorUmwanya
- 1 ikirundoUmwanya
- Umwanya
- 1 igiceUmwanya
- 1 divider, AND gate, counter, latch, resetUmwanya
- Umwanya
- Umwanya
- 1 as neededUmwanya
- 1 igiceUmwanya
- Umwanya
Ibikoresho bikenewe
4- Umwanya
- Umwanya
- 2 vendors sell this, none ship to you yetUmwanya
Ibikoresho by'Ibishushanyo Bifitanye Isano
Iki gishushanyo gikora
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