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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.
Advanced
Workshop process
Instructions
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.
Materials for this step:
Dial Gauge Case with Graduated Dial1 piece2
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.
Materials for this step:
Pointer Arbor and Pointer1 piece
Gauging Bar1 piece
Fine Chain1 pieceTools needed:
Precision Tweezers Set
Screwdriver Set3
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.
Materials for this step:
Arbor Return Spring1 pieceTools needed:
Precision Tweezers Set4
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.
Materials for this step:
Caliper Jaws1 piece
Depth Gauging Rod1 pieceTools needed:
Screwdriver SetMaterials
7- Placeholder
- 1 piecePlaceholder
- 1 piecePlaceholder
- 1 piecePlaceholder
- 1 piecePlaceholder
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Tools Required
2- Placeholder
- Placeholder
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