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Thread: Turning aluminium
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13th Oct 2019, 11:57 PM #16
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14th Oct 2019, 12:39 AM #17China
- Join Date
- Dec 2005
- Location
- South Australia
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- 1,656
Rough it out with a jigsaw and then true it up with a boring bar
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14th Oct 2019, 12:42 AM #18Member: Blue and white apron brigade
- Join Date
- Feb 2006
- Location
- Perth
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- 7,182
I use a regular (not sawtooth) Forstner bit often on Al as it generates a REALLY NCE FINISH. It works easily enough up till about 25 mm diameter bits but above that it gets harder. A 50 mm Forstner requires the lowest gear on my 1.5HP DP. The swarf is really cute and curly.
Today I bored holes between 62 and 72 mm in diameter though two layers of 5mm Al with a 5 mm Nitrile rubber layer in between the two Al layers.
One of the Al layers was a ~200 x 150 while the other Al layer and the rubber was 100 x 100 mm with all 3 required to be concentric to the middle.
All 3 layers were held concentric using M6 cap screws, one screw in the centre and 4 around the outside of the 100 mm Al pice., thru the rubber and into the 150 x 200 mm piece.
The large piece just fit and turned in the lathe 4 Jaw after I removed a small section off each corner. I used a parting tool and made stepped cuts at around the 60 mm diamanté's mark and then used a boring bare thereafter to turn all 3 layers to size.
I'll post some pics when I finish making my latest doodad.
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