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Grooved Pulley Cut from Sheet Tin with Alternately Bent Tongues (Boy Mechanic, 1913)
A small round-belt pulley from a disc of tin: slits cut in from the rim to a ring of punch marks, the tongues bent alternately left and right to form a V groove, and a soldered strip across the middle as the hub.
Beginner
An hour
Instructions
1
1
How many tongues
How many tongues
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2
2
Read the Boy Mechanic
Read the Boy Mechanic
"It is remarkable with how slight care a perfectly true wheel may be made in this manner."
3
3
Lay out
Lay out
On tin, draw a circle the size of the groove bottom and a second circle 1/4 in larger in radius around it. Cut out on the large circle.
Materials for this step:
Tinplate Sheet1 pieceTools needed:
Compass
Tin Snips4
4
Dent and slit
Dent and slit
Mark slight dents about 1/4 in apart all round the small circle with a prick punch or nail. Cut in from the edge to each dent, stopping when the shears click into it.
Tools needed:
Center Punch
HammerTin Snips5
5
Form the groove
Form the groove
Bend the tongues alternately to right and left and shape them carefully into an even running surface for the belt.
Tools needed:
Flat-Nose Pliers6
6
Add the hub
Add the hub
Solder or rivet a strip ('handle') across the centre hole and drill through it the same size as the hole. Solder the tongues where needed to stiffen the wheel.
Materials for this step:
Tinplate Sheet1 piece
Tin-Lead Solder1 piece
Copper Rivets1 pieceTools needed:
Hand Drill
Soldering Iron7
7
Troubleshooting
Troubleshooting
Tin pulley troubleshooting.
Flow
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8
8
History and honest limits
History and honest limits
From **The Boy Mechanic, Book 1** (Popular Mechanics, 1913), p. 412, by C. W. Nieman (checked on the archive.org scan boymechanic0000unse_n5a8). Sizes in the table are our examples.
Materials
3- 2 piecesPlaceholder
- 1 piecePlaceholder
- 1 piecePlaceholder
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