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TEKNOLOJIA
VAZI
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.
Kati
1 day
Maagizo
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.
Vifaa kwa hatua hii:
Bamba la chuma laini1 kipandeZana zinazohitajika:
Bikari ya ncha mbili
Kichora Mistari
Kigwe cha Katikati
Nyundo yenye kichwa cha msalaba
Kipima-unene cha dijitali cha inchi 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.
Zana zinazohitajika:
Kekee cha Nguzo
Seti ya vichimbuziKipima-unene cha dijitali cha inchi 6
Miwani ya usalama3
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.
Zana zinazohitajika:
Msumeno wa chuma
Kibano cha meza ya kazi
Seti ya tupa4
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.
Zana zinazohitajika:
Mnyororo wa rolaSeti ya tupa5
5
Pitch circle
Pitch circle
Inapakia daftari la Jupyter…
Vifaa
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