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Dial Gauge: Logan, 1883
John Logan of Waltham, Massachusetts, patented this dial gauge in 1883, US 283,627. A gauging bar slides lengthwise through guides in a case with a graduated dial. A chain fixed to the bar is wound round the arbor that carries the pointer, so when the bar moves the chain unwinds and turns the pointer. The pointer's end moves much further than the bar, which makes the reading very delicate. A spring on the arbor winds the chain back and returns the bar to zero. A jaw on the case and a jaw on the bar make it a caliper; a slender rod beside the bar's other end makes it a depth gauge.
Osezingeni eliphezulu
Workshop process
Imiyalelo
1
1
Case and dial
Case and dial
Make the case with the graduated dial, with tubular guide projections at opposite sides for the gauging bar.
Izinto zokwakha zalesi sinyathelo:
Ikesi le-dial gauge elinobuso obunezikali1 ucezu2
2
Arbor, chain and bar
Arbor, chain and bar
Pivot the arbor carrying the pointer at the dial's centre. Pass the gauging bar through the guides and connect it to the arbor by a chain fixed to the bar and wound round the arbor.
Izinto zokwakha zalesi sinyathelo:
I-arbor yenaliti nenaliti1 ucezu
Induku yokulinganisa1 ucezu
Iketango elincane1 ucezuAmathuluzi adingekayo:
Isethi yamatweezer anembayo
Isethi yezikulufudrayiva3
3
Return spring
Return spring
Connect a spring between the arbor and the case so that it turns the arbor to wind the chain and draws the bar back to the zero position.
Izinto zokwakha zalesi sinyathelo:
Isprinji ebuyisela i-arbor1 ucezuAmathuluzi adingekayo:
Isethi yamatweezer anembayo4
4
Jaws and depth rod
Jaws and depth rod
Fix a jaw on the case and a matching jaw on the bar; when they touch, the pointer reads zero. Fix a slender gauging rod beside the guide at the other end, in line with the bar's end at zero, for measuring depths.
Izinto zokwakha zalesi sinyathelo:
Imihlathi ye-caliper1 ucezu
Induku yokulinganisa ukujula1 ucezuAmathuluzi adingekayo:
Isethi yezikulufudrayivaIzinto
7- Isibambeli
- 1 ucezuIsibambeli
- 1 ucezuIsibambeli
- 1 ucezuIsibambeli
- 1 ucezuIsibambeli
- 1 ucezuIsibambeli
- 1 ucezuIsibambeli
Amathuluzi Adingekayo
2- Isibambeli
- Isibambeli
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