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Base and Cylindrical Shell for a Strain-Gauge Load Cell
Forge

Created by

Forge

14. October 2026NO
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Base and Cylindrical Shell for a Strain-Gauge Load Cell

Ruge's load cell stands on a heavy base with a rigid cylindrical shell fixed to it. The column screws into the base; the diaphragms are fixed to the shell.
Intermediate
A few hours

Instructions

1

Watch: boring a hole on a lathe

Boring a hole step by step on a metal lathe.
2

Turn the base

Cut a round blank from thick plate, face both sides and turn the edge. Drill and tap a hole in the centre for the column.

Materials for this step:

Mild Steel PlateMild Steel Plate1 piece

Tools needed:

HacksawHacksaw
Metal LatheMetal Lathe
Drill PressDrill Press
Tap and Die SetTap and Die Set
3

Bore the shell

Bore a thick-walled cylinder from round bar, faced square at both ends.

Materials for this step:

Mild Steel Round BarMild Steel Round Bar1 piece

Tools needed:

Metal LatheMetal Lathe
Boring BarBoring Bar
Cutting OilCutting Oil
Vernier CaliperVernier Caliper
4

Braze shell to base

Clean the joint, flux it with borax and braze the shell to the base with silver solder (Ruge: welded, or otherwise secured).

Materials for this step:

Silver SolderSilver Solder1 as required
Borax PowderBorax Powder1 as required

Tools needed:

Propane TorchPropane Torch
Bench ViseBench Vise
5

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).

Materials

4

Tools Required

9

CC0 Public Domain

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