UBUHANZI
UBWIZA N'UBUZIMA
UBUKORIKORI
UMUCO N'AMATEKA
IMYIDAGADURO
IBIDUKIKIJE
IBIRIBWA N'IBINYOBWA
UBWUBATSI BUSUBIRA INYUMA
UBUMENYI
SIPORO
IKORANABUHANGA
IBYAMBARWA
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.
Hagati
1 day
Amabwiriza
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.
Ibikoresho by'iyi ntambwe:
Ikibaho cy'icyuma cyoroheje1 igiceIbikoresho bikenewe:
Ikizunguruka gifite imitwe ibiri
Igikoresho Gishushanya Imirongo
Igicukuzi cyo Gushyira Ikimenyetso
Inyundo ifite umutwe utambitse
Ikigereranyo cya Digitale cy'Amasentimetero 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.
Ibikoresho bikenewe:
Icyuma Cyivumbura Gihagaze
Ibyuma Byinshi byo GucukuraIkigereranyo cya Digitale cy'Amasentimetero 6
Amadarubindi y'umutekano3
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.
Ibikoresho bikenewe:
Umucumita w'Ibyuma
Ifatiro ry'Ameza
Amakariso Menshi4
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.
Ibikoresho bikenewe:
Umunyururu w'ibizungurukaAmakariso Menshi5
5
Pitch circle
Pitch circle
Gupakira ikaye ya Jupyter…
Ibikoresho
1- 1 igiceUmwanya
Ibikoresho bikenewe
12- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
Iki gishushanyo gikora
Blueprint zijyanye
Izi blueprint zisangira ubumenyi — uburyo, ibikoresho cyangwa amahame
CC0 Umurenge rusange
Iyi blueprint yasohowe munsi ya CC0. Ushobora gukoporora, guhindura, gukwirakwiza no gukoresha nta kwemererwa.
Shyigikira Umuremyi ugura ibicuruzwa binyuze muri Blueprint ye Komisiyo y'Umuremyi byashyizweho n'Abacuruzi, cyangwa kora verisiyo nshya y'iyi Blueprint ukayinjiza nk'isano muri Blueprint yawe kugira ngo musangire inyungu.