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Tool Talk Discussion Forum

milling an angle

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Little Ed

07-13-2004 18:26:01




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I am needing to mill a 12 degree angle across a piece of 4 inch wide stock on a bridgeport type milling machine. How can I set the angle correctly? Surely there is a better way than trial and error.




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Irv

07-14-2004 05:22:04




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 Re: milling an angle in reply to Little Ed, 07-13-2004 18:26:01  
#1 Get the Machinist handbook. Depending on the size of the part, I would probably do it in a vise, with the angle scribed on the side. But if you need real acuraccy - you need to grind it. You will need to mill first, then grind. I really can't tell you more, not knowing exactly what tooling you have. Irv



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Davis In SC

07-13-2004 19:05:38




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 Re: milling an angle in reply to Little Ed, 07-13-2004 18:26:01  
Does angle need to be exact ??? If it does not have to be perfect, degree markings on head should be close enough. Or if you have a mating part, dial head in with an indicator, using it a a gage. Otherwise, you are stuck using a sine plate, or using a sine bar & a dial indicator to tram in the angle on the head. Regards, Davis



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kraigWY

07-13-2004 21:06:58




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 Re: Re: milling an angle in reply to Davis In SC, 07-13-2004 19:05:38  
Thats a rather simple project. Get or make a sine bar, set it up on the table of the machine at the requred degrees, mount the work to the sine bar and mill it. Get a Machinery Handbook for this and other procedures.



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Little Ed

07-13-2004 19:54:27




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 Re: Re: milling an angle in reply to Davis In SC, 07-13-2004 19:05:38  
thanks for the quick response. I am going for extreme accuracy on this one, so I needed a way to dial it in. Don't have a lot of machinist experience and this one was throwing me.



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markct

07-14-2004 06:59:23




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 Re: Re: Re: milling an angle in reply to Little Ed, 07-13-2004 19:54:27  
what is it your making? if you are truly going for extreme accuracy then you want it ground not milled, a mill is good to within a couple thousandths generaly, sometimes a little better, sometimes a little worst if the machine is older



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