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Thread: Machining in Southern Asia
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15th Nov 2021, 08:19 AM #16Pink 10EE owner
- Join Date
- Aug 2008
- Location
- near Rockhampton
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- 6,216
Looks like those crankshafts are for Perkins 3.152 engine. They have even gone so far to cast a Perkins logo and name in the casting.
However I suspect the Perkins 3.152 engine should have a forged crankshaft and those are not fit for for purpose. Where is all he quality control?Gold, the colour of choice for the discerning person.
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15th Nov 2021, 09:45 AM #17Golden Member
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- Apr 2018
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- Drouin Vic
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I particularly liked the on / off switch for the lathe, operator #2 I think it was, located on the wall behind him. No doubt this is also the emergency stop for when the flowing pyjamas are dragging him in.
Have a look at this nice shiny end product and then picture those same manufacturing techniques and quality control standards applied to every single component...https://www.youtube.com/watch?v=KRdqimZp98A
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15th Nov 2021, 07:00 PM #18
From the same series: This video shows a furnace that is melting scrap metal down for casting into truck suspension bogies https://www.youtube.com/watch?v=5JrVpAddSYI
THE Ebay retailers of these repro Perkins crankshafts are asking around $500. I guess these repro cranks are not as good as the originals but they probably last long enough for the average hobby farmer to do his annual slashing jobs. With so many engine rebuild shops having closed down in Australia , I can understand why somebody would buy a new crank instead of having the original crank reground to size - if you live in a more remote location , a new crank delivered to your door is a appealing thought.
Some history: Massey Ferguson bought the U.K. Perkins factory in 1959.
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16th Nov 2021, 06:03 PM #19Senior Member
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- Nov 2008
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- Sydney
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- 112
The chips from the machining look different from my experience with grey cast iron. I suspect the cranks are cast from spheroidal graphite (SG) cast iron which is a legitimate and common material for crankshaft manufacture. The process was pioneered by Ford for the production of their V8 engines, and is used by many manufactures to-day. It is much cheaper than a forging, and adequate for many engines.
Chas.
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16th Nov 2021, 08:47 PM #20
SG Iron
https://www.sciencedirect.com/topics...g/nodular-iron
Nodular (spheroidal graphite) cast iron
Nodular iron is also called ductile iron. The graphite is present as tiny balls or spheroids. Because the spheroids interrupt the matrix much less than graphite flakes, nodular cast iron has higher strength and toughness than gray cast iron. The formation of nodules or spheroids occurs when eutectic graphite separates from the molten iron during solidification. The separation of graphite in nodular form is similar to separation of graphite in gray cast iron except that the additives facilitate the graphite to take nodular shape.
Spheroidal graphite (SG) cast iron has excellent toughness; it has higher elongation and is used widely, for example, in crankshafts. Unlike malleable iron, nodular iron is produced directly from the melt and does not require heat treatment. Magnesium or cerium is added to the ladle just before casting. The matrix can be either ferrite or pearlite or austenite. The quality of SG iron is excellent, and X-ray quality castings are regularly produced.
The latest breakthrough in cast irons is where the matrix of SG cast iron is not pearlite but bainite. The chemical composition of the SG cast iron is similar to that of the gray cast iron but with 0.05 wt% of magnesium. This results in a major improvement in toughness and strength. The bainite is obtained by isothermal transformation of the austenite at temperatures below which pearlite forms. The process of graphitization is discussed in some detail in the chapter on heat treatment.
Time line of events https://www.thefreelibrary.com/Timeline+of+ductile+iron+history.-a021265471
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