Thread: Discussion Model Diesel Engines
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Old Mar 16, 2011, 01:45 PM
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Mind, this is a non-expert thinking out loud...

When machining a crankcase casting, the most obvious starting point would be the crankshaft bore....

This done, next step would be milling the external mating surfaces.
If the milling jig consists of a mandrel (is this the correct term?), fitting into the newly made crankcase bore, the angularity and distances (e.g. A/A) would be perfectly true....even though the initial crankcase bore is slightly non-linear to the casting.....or in case of the proverbial potato...

So far so good...with a proper jig setup all should be well, the function of this engine would be perfect, even though the shaft appears to poke in some direction, related to the crankcase, as the shaft bore is the reference to the entire geometry...

However a poor/worn jig, or a poor basic setup of same, would obviously upset all good intentions...

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Last edited by Gluehand; Mar 16, 2011 at 01:55 PM.
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