Ushirikiano
SANAA
UREMBO NA USTAWI
UJANJA
UTAMADUNI NA HISTORIA
BURUDANI
MAZINGIRA
CHAKULA NA VINYWAJI
UHANDISI WA KINYUME
SAYANSI
MICHEZO
TEKNOLOJIA
VAZI
Bathroom Scale: Four Flat Load Cells Between Two Plates (Angel, 1991)
A floor scale only as thick as two plates. Four flat load cells sit in the corners between a base and a top plate; their strain gauges are wired into one bridge, so the signal is the sum of the four loads wherever you stand.
Result: a low digital bathroom scale reading in pounds or kilograms. The patent gives under 0.05 % non-linearity, hysteresis and non-repeatability, and under 0.1 % error from off-centre loads; its feet let it stand on thick carpet.
Source: S. Angel, US Patent 4,993,506 (1991). Unknown: the plate material and size, the maximum load, and the circuit. Ours: ebonite for the hard rubber, epoxy, the amplifier and display parts. Picture: patent drawing (Fig. 5).
Juu
2 days
Maagizo
1
1
Mount the four load cells
Mount the four load cells
Put one load cell in each corner of the rigid base plate. Screw each one down to small flat raised pads on the plate. Place the pads away from the edge of the cell's beam, so that fixing the cell does not change its sensitivity. Under each cell, tap two holes through the base for the overload screws. Not given: the plate material and size.
Vifaa kwa hatua hii:
Seli ya mzigo4 vipande
Kitako na bamba la juu la mizani1 base and top plate
Skrubu za mashine8 cell screwsZana zinazohitajika:
Seti ya kukata nyuzi za skrubu
Seti ya bisibisi
Vipimo visivyojulikana2
2
Wire one bridge and the readout
Wire one bridge and the readout
Each cell's two gauges are half a Wheatstone bridge. Join the four halves into one full bridge, one half at each corner, so the bridge gives a signal in step with the sum of the four loads. The signal is amplified, turned into numbers by an analog-to-digital converter, worked into pounds or kilograms and shown on a display. Put the electronics and batteries in the space between the plates. Not given: the circuit. Ours: an op-amp and a segment LCD.
Vifaa kwa hatua hii:
IC ya kikuza-ishara1 amplifier
Kigeuzi cha Analogi kuwa Dijitali1 kipande
Paneli ya LCD ya sehemu1 kipande
Betri1 as the circuit needs
Waya wa kuunganishia1 as needed
Waya wa Lehemu1 a littleZana zinazohitajika:
Chuma cha kulehemia3
3
Fit the top plate on hard rubber pads
Fit the top plate on hard rubber pads
Glue four flat round pads of a rigid but slightly yielding material, such as hard rubber, under the top plate. Give each pad small round studs that snap into the two load holes of its cell, so the weight goes in at the centres of those holes. The pads soften impacts when something is dropped on the scale and take up sideways forces as the top plate bends. The snaps let the top plate be pulled off for repairs. Ours: ebonite and epoxy.
Vifaa kwa hatua hii:
Fimbo ya eboniti1 four pads
Epoksi ya Sehemu Mbili1 a littleZana zinazohitajika:
Msumeno wa chuma4
4
Fit the feet
Fit the feet
Under the base, below each cell, fix a shallow foot of flexible material such as hard rubber, rounded underneath. Put its lowest point exactly below the centre of the cell's beam: the floor then pushes up at the beam's centre without bending it, and the scale works on thick carpet or uneven floors. Ours: ebonite.
Vifaa kwa hatua hii:
Fimbo ya eboniti1 four feetEpoksi ya Sehemu Mbili1 a littleZana zinazohitajika:
Msumeno wa chuma5
5
Set the overload stops
Set the overload stops
Load the scale to its maximum capacity. Turn the short screws in from below until they just touch the arms of each cell's loading element, then lock them with adhesive. Any heavier load now rests on the screws instead of bending the cells further. Not given: the maximum capacity. Ours: calibration weights and epoxy.
Vifaa kwa hatua hii:
Skrubu za mashine8 overload screwsEpoksi ya Sehemu Mbili1 a littleZana zinazohitajika:
Seti ya vipimo vya urekebishajiSeti ya bisibisiVifaa
11- 4 vipandeKishikilia Nafasi
- 1 base and top plateKishikilia Nafasi
- 8 overload screwsKishikilia Nafasi
- 1 amplifierKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- 1 as the circuit needsKishikilia Nafasi
- 1 as neededKishikilia Nafasi
- 1 a littleKishikilia Nafasi
- 1 four feetKishikilia Nafasi
- 3 a littleKishikilia Nafasi
Zana Zinazohitajika
6- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- 2 vendors sell this, none ship to you yetKishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
Vifaa vya Michoro Iliyounganishwa
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.