cam bore machining
cam bore machining
(OP)
Cam bore machining.
I have been working on a OHC small diesel engine. The client has stated that the cam bore has to be machined in its free state. That is no high loaded clamps, or assembly to the block to simulate head distortion during assembly will be allowed during machining. Obviously if I can do this it will be better for the head cycle time. This is an integral bored cam (no cam caps). Does anyone know if this is normal practice?
I have been working on a OHC small diesel engine. The client has stated that the cam bore has to be machined in its free state. That is no high loaded clamps, or assembly to the block to simulate head distortion during assembly will be allowed during machining. Obviously if I can do this it will be better for the head cycle time. This is an integral bored cam (no cam caps). Does anyone know if this is normal practice?





RE: cam bore machining
Diesels with nonreplaceable parts, e.g. integral cam bearings, are unusual.
It's what the client wants. THAT's normal practice.
Mike Halloran
Pembroke Pines, FL, USA
RE: cam bore machining
Makes me wonder if it is instead an unfortunate reference to GD&T standard requirements for inspections to be made with the part in the free state.
A fixture that picks up the head at a few strategic points could provide neutral support for a head, even one with slight but acceptable bow or twist for cam bore finishing
RE: cam bore machining
Mike L.
RE: cam bore machining
RE: cam bore machining
RE: cam bore machining
If your getting the cam journals line bored. Make sure the head deck is machined prior so that it is completely flat. Within 0.018mm overall. As long as that is flat and the line boring clamp fixture does not distort the head you should be fine. Keep the concentricity /alignment of the inner bores to the outer bores tight. no more than 0.050mm.
RE: cam bore machining
Regards
Pat
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