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Bench Grinder: Made from an Old Engine Piston (Shop Notes, 1919)
A belt-driven bench grinder or polishing head built from a worn engine piston: the shaft runs in bushings in the piston-pin bosses, the belt pulley turns inside the piston (which guards it), and emery or polishing wheels go on one or both ends.
Source: Popular Mechanics Shop Notes for 1919, p. 3249. Unknown: sizes. Picture: the article's drawing.
Intermediate
Unknown
Instructions
1
1
Bush the piston
Bush the piston
Fit the piston-pin bearings of an old piston with brass or bronze bushings, or pour babbitt round the shaft to form the bearing. Fit a grease cup on top, as in the drawing.
Materials for this step:
Piston and Rod Assembly1 old piston
Brass Tube2 bushings
Unknown Metal1 grease cupTools needed:
Hand Drill
Metal File2
2
Fit shaft, pulley and wheels
Fit shaft, pulley and wheels
Cut oil grooves along the shaft. Put the belt pulley on it inside the piston, where the piston wall guards the belt. Hold the shaft endwise with collars and setscrews, and mount emery or polishing wheels on one or both ends.
Materials for this step:
Mild Steel Rod1 piece
Pulley1 piece
Shaft Collar2 pieces
Grinding Wheel1 emery or polishingTools needed:
Metal Lathe
Adjustable Spanner3
3
Mount it
Mount it
Bolt the piston to the bench or to a special stand; make the stand very stiff for the high speeds these tools run at.
Materials for this step:
Hex Bolt - Grade 8.81 number not givenTools needed:
Adjustable SpannerMaterials
8- 1 old pistonPlaceholder
- 2 bushingsPlaceholder
- 1 grease cupPlaceholder
- 1 piecePlaceholder
- 1 piecePlaceholder
- 2 piecesPlaceholder
- 1 emery or polishingPlaceholder
- 1 number not givenPlaceholder
Tools Required
4- Placeholder
- Placeholder
- Placeholder
- Placeholder
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