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Gearheads
How to machine a hole on a lathe?
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<blockquote data-quote="Shadowrider" data-source="post: 4138194" data-attributes="member: 3099"><p>Yea, bore it first but just to the length you need the part to be plus the thickness of your part-off tool, or there about. Then part it off with your part off tool going into the bored hole. </p><p></p><p>You will only have .625" wall thickness from your given dimensions and you are working with aluminum. The chuck will distort it easily. You could very well end up with a round hole while you are machining it and a triangular hole (assuming a 3 jaw chuck) when you unchuck the material. You want to be chucking on solid material if at all possible. Steel wouldn't be quite the issue but you still need to be aware. Chucks are strong...</p></blockquote><p></p>
[QUOTE="Shadowrider, post: 4138194, member: 3099"] Yea, bore it first but just to the length you need the part to be plus the thickness of your part-off tool, or there about. Then part it off with your part off tool going into the bored hole. You will only have .625" wall thickness from your given dimensions and you are working with aluminum. The chuck will distort it easily. You could very well end up with a round hole while you are machining it and a triangular hole (assuming a 3 jaw chuck) when you unchuck the material. You want to be chucking on solid material if at all possible. Steel wouldn't be quite the issue but you still need to be aware. Chucks are strong... [/QUOTE]
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