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Overload Safety Ring for a Strain-Gauge Load Cell
A ring under Ruge's piston, set a hair below it: past the safe load the piston lands on it and the excess goes straight to the base. The gauge leads pass through a hole in it.
Intermediate
A few hours
Instructions
1
1
Watch: boring a hole on a lathe
Watch: boring a hole on a lathe
Boring a hole step by step on a metal lathe.
2
2
Turn and bore the ring
Turn and bore the ring
Turn a short length of round bar to fit inside the shell and bore it to clear the column.
Materials for this step:
Mild Steel Round Bar1 pieceTools needed:
Hacksaw
Metal Lathe
Boring Bar
Cutting Oil3
3
Face to height, drill the lead hole
Face to height, drill the lead hole
Face it to height so the piston clears it by a small gap at full load. Drill a side hole for the gauge leads.
Tools needed:
Metal Lathe
Drill Press
Micrometer4
4
Limits
Limits
Ruge's patent gives the part's shape and job but no material or size. Mild steel and silver-solder brazing are our choice; size it to the load you need. Lathe method after Palmateer, Elementary Machine Shop Practice (1918). The gap sets the overload point.
Materials
1- 1 piecePlaceholder
Tools Required
6- Placeholder
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