Re: ON topic- Flycutting ALuminium
- From: BottleBob <bottlbob@xxxxxxxxxxxxx>
- Date: Sun, 27 Jan 2008 19:35:46 -0800
Tomorrow I will be working on aluminium plate 30" X 16" X 0.625" thick with
tolerance of 0.001" flatness an parallelism and I think I will end up using
a fly cutter as from my experience nothing else will take a finish cut
I think you'll frustratingly disappointed.
If it were me (and with that flatness tolerance), I'd not touch the flat surfaces, but I'd rough out your perimeter, all your features & large holes, then send it out to be blanchard ground - then when you get it back, finish your perimeter, features, and holes.
The thing about 6061 is it has a "skin" under stress. When you relieve that stress by removing material on one side, the part bows. Sometimes you can removed a similar amount of material off the other side and get lucky and have it bow back to being relatively flat. But a flatness of ..001, unrestrained? Even a blanchard grinder is going to have trouble with that one across 30".
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