Ubufatanye
UBUHANZI
UBWIZA N'UBUZIMA
UBUKORIKORI
UMUCO N'AMATEKA
IMYIDAGADURO
IBIDUKIKIJE
IBIRIBWA N'IBINYOBWA
UBWUBATSI BUSUBIRA INYUMA
UBUMENYI
SIPORO
IKORANABUHANGA
IBYAMBARWA
Worm and Worm Wheel: a Steel Screw and a Hobbed Bronze Wheel
A worm is a screw that drives a toothed wheel at right angles; with a single-start worm each turn moves the wheel one tooth, so a 30-tooth wheel gives 30:1. Cut the worm on a screw-cutting lathe, make a hob that is a copy of it with cutting edges, gash the bronze wheel on the dividing head, then run the hob through it to finish the teeth.
The picture: a worm shaft with its bearings and a hobbed bronze worm wheel from a gearbox.
Hejuru
Three to four days
Amabwiriza
1
1
Cut the worm
Cut the worm
Turn the steel bar to the worm's diameter and set the lathe's change gears to the axial pitch (π × module). Cut the single-start thread with a tool ground to the tooth form, checking it with the gauge.
Ibikoresho by'iyi ntambwe:
Umurongo uziguye w'icyuma cyoroheje1 igiceIbikoresho bikenewe:
Imashini yo guhinguza icyuma
Ibikoresho byo Kuzenguruka Ibiti bya HSS
Ikipimo cy'imizingo
Kalipe ya Vernier
Amavuta yo gukata2
2
Make the hob
Make the hob
Cut the same thread a little oversize on tool steel, file four or more lengthwise flutes across it to make cutting edges, back off behind each edge, then harden and temper it.
Ibikoresho by'iyi ntambwe:
Inkoni ifite impande umunani y'icyuma cy'ibikoresho1 igiceIbikoresho bikenewe:
Imashini yo guhinguza icyuma
Ikariso ry'Icyuma
Uruganda rw'umucuzi
Indobo yo gukonjesha
Amadarubindi y'umutekano3
3
Cast and turn the wheel blank
Cast and turn the wheel blank
Melt bronze in a crucible, cast a round blank, and turn it on a mandrel to the wheel's diameter with a hollow rim to wrap the worm.
Ibikoresho by'iyi ntambwe:
Igice cya bronze1 kg
Amakara1 as requiredIbikoresho bikenewe:
Uruganda rw'umucuzi
Ikirahure cy'Ibumba Rirwanya Umuriro
Amakoro y'Icyombo Gishongesha
Imbumbe yo gusukamo icyuma gishongeyeImashini yo guhinguza icyuma
Inkoni ya mandrel
Uturindantoki two gukomeza ibyuma4
4
Gash the teeth
Gash the teeth
Mount the blank on the dividing head with the cutter path set at the worm's lead angle and cut a slot for every tooth, nearly to depth.
Ibikoresho bikenewe:
Imashini ibaza icyuma
Umutwe wo KugabanyaAmavuta yo gukata5
5
Hob to shape
Hob to shape
Run the hob in mesh with the gashed blank, free to turn, feeding it in gradually to full depth: it drives the blank round and generates the true tooth form.
Ibikoresho bikenewe:
Imashini ibaza icyuma
Igikata amenyo y'uruziga rwa wormuAmavuta yo gukata6
6
Sizes for a 30:1 set
Sizes for a 30:1 set
Gupakira ikaye ya Jupyter…
7
7
Limits
Limits
Worm drive principles, gashing and hobbing are as Wikipedia describes them; the module, tooth count and making the hob from the worm's own thread are ours. A single-start set like this is usually self-locking, which depends on lead angle and friction.
Ibikoresho
4- Umwanya
- Umwanya
- 1 kgUmwanya
- 1 as requiredUmwanya
Ibikoresho bikenewe
17- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
Iki gishushanyo gikora
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