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Sprocket for 1/2-Inch Chain, Cut by Hand from Steel Plate
A sprocket is a toothed wheel that drives a roller chain. Bicycle chain has a 1/2 inch (12.7 mm) pitch, the distance between pin centres (Wikipedia, Bicycle chain), so the teeth are spaced one pitch apart round a pitch circle whose size follows from the number of teeth. This one is cut by hand from steel plate: a hole at each pitch point for the roller, then the teeth sawn and filed between them. Method and sizes are ours.
The picture: our drawing.
Ophakathi
1 day
Imiyalelo
1
1
Lay out the pitch circle
Lay out the pitch circle
Work out the pitch-circle diameter for your number of teeth in the notebook (18 teeth: 73.1 mm). On 3 mm mild steel plate, scribe that circle and the outside circle a few millimetres larger, and step round the pitch circle with the dividers set to 12.7 mm, adjusting until the last step closes exactly. Punch each point.
Izinto zokwakha zalesi sinyathelo:
Ishidi lensimbi ethambile1 ucezuAmathuluzi adingekayo:
Ikhampasi yamachopho amabili
Insimbi Yokudweba Imigqa
Isibhoboza Sesikhungo
Isando esinekhanda elimise okwesikhonkwane
I-Caliper Yedijithali Yamayintshi Ayi-62
2
Drill the roller seats
Drill the roller seats
Measure a roller on your chain and drill a hole of that size at every punched point; these become the bottoms of the tooth spaces. Drill the centre for the hub.
Amathuluzi adingekayo:
Ibhola Elimile
Iqoqo Lamakhanda EbholaI-Caliper Yedijithali Yamayintshi Ayi-6
Izibuko zokuphepha3
3
Cut out the teeth
Cut out the teeth
Saw round the outside circle, then saw in from the rim to each hole along two lines that open outward, and file the tooth flanks and tips smooth and rounded so the rollers can enter and leave.
Amathuluzi adingekayo:
Isaha Sensimbi
Isibambo Sebhentshi
Iqoqo Lamafayela4
4
Try the chain
Try the chain
Wrap the chain round half the sprocket: every roller should drop into a space without riding up. Ease any tight tooth with the file.
Amathuluzi adingekayo:
Iketanga lama-rollerIqoqo Lamafayela5
5
Pitch circle
Pitch circle
Ilayisha incwadi ye-Jupyter…
Izinto
1- 1 ucezuIsibambeli
Amathuluzi Adingekayo
12- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
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