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Finish machining elliptical bores

Finish machining elliptical bores

Finish machining elliptical bores

(OP)
  I need information on manufacturing processes to finish machine an elliptical bore in aluminum/magnesium die castings or extrusions.  Thanks

RE: Finish machining elliptical bores

if you need the entire length of an extruded part to have a precisely finished bore, you will probably have to draw over a mandrel, which will swage the inner surface.  A cutter head can also be drawn or pushed thru.  This is where a really good toolgrinding shop can save you some headache, rather than experimenting.  On a diecasting, if the bore depth is not too deep in relation to the size of your ellipse, you could just machine these on a machining center or even jig grind them, depending on your surface finish requirement.  

RE: Finish machining elliptical bores

Broaching is probably your best bet if cycle time is important.  It is a very consistent process and the tool should last a long time in this material.

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