ATV engine case repair

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I've been working on this case I had that was broken. The hole is completely patched now, but I don't have any pictures yet. The case is from a Honda 250R threewheeler/fourwheeler. Its been welded up using a Miller Dialarc TIG with pretty good results, except for a few times when the surface wasn't clean (my own fault). The machining of the weld back down has been done with an Enco vertical mill. Working out real well. This is the first time I've done much aluminum work. Attached Images
Reply:Another picture of the case broken before I started working on it. Attached Images
Reply:Here it is in the mill after its been welded up some and been cut back down. Attached Images
Reply:Last picture, this is the top side of the case on the mill table. Attached Images
Reply:Heres a picture from the inside, of the hole patched. I ended up having a few pin holes in an area or two, so I'm having to go back over it again. Attached Images
Reply:I've done alot of case repairs, mostly from chains binding up on the front sprocket.  Alot of the time, people just want it patched up while it's still together. We don't have a mill at work yet, so lots of different burr bits have to do the trick.  But, as for the impurities, I try to boil them out with the tig.  Then I brush and tig again and sometimes drill.  I've been getting pretty quick at it since not one customer has brought in clean broken aluminum to date. Oh yeah, and the countless repair jobs done with JB weld that failed is something I never look forward to.Common sense in an uncommon degree is what the world calls wisdom.
Reply:Brianfarththat's a great linkthanks
Reply:yep turn up the tig and burn out immpurities