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Steel Shaft, 30 mm: Round Bar Turned Between Centres
A shaft carries gears, wheels and bearings, and it has to be straight, round and true to size where they fit. Turned between centres from a forged round bar, it can be taken out, checked and put back without losing its axis.
The picture: a steel bar being turned between centres, driven by a lathe dog.
Hagati
An afternoon
Amabwiriza
1
1
Cut the bar
Cut the bar
Saw a length of round bar a few millimetres oversize in diameter (about 33 mm for a 30 mm shaft) and a little longer than the finished shaft.
Ibikoresho by'iyi ntambwe:
Umurongo uziguye w'icyuma cyoroheje1 igiceIbikoresho bikenewe:
Umucumita w'Ibyuma2
2
Mount it between centres
Mount it between centres
Face both ends, centre-drill them and mount the bar between centres, driven by a lathe dog, as in Turning Between Centres.
3
3
Turn to 30 mm
Turn to 30 mm
Rough down to about 30.5 mm with light oiled cuts, then take a fine finishing cut to 30.00 mm, measuring with a micrometer at both ends and the middle. Turn the dog to the other end and finish the length under it.
Ibikoresho bikenewe:
Imashini yo guhinguza icyuma
Ibikoresho byo Kuzenguruka Ibiti bya HSS
Amavuta yo gukata
Mikorometero
Amadarubindi y'umutekano4
4
Check it runs true
Check it runs true
With the shaft back between centres, run a dial indicator along it. Break the sharp corners at the ends.
Ibikoresho bikenewe:
Igipimo cy'urushinge (dial indicator)Imashini yo guhinguza icyumaIbikoresho
1- Umwanya
Ibikoresho bikenewe
7- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
Iki gishushanyo gikora
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