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Tool Talk Discussion Forum

Fly Cutter

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Alex

03-01-2004 10:09:39




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Does anybody here know the maximum amount of steel that can be removed in one pass with the fly cutter running @ 310 RPM? I think that I'm wasting a lot of time using it set to .030, with a slow feed.




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Alex

03-02-2004 12:31:27




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 Re: Fly Cutter in reply to Alex, 03-01-2004 10:09:39  
Thanks for all the replies.
Sorry that I didn't provide more information. I'm taking night classes at the local community college, and we are using HSS fly cutters to clean up cold rolled 3/4 x 1 1/2 x 1 3/4 stk., before surface grinding. I personally am not in any hurry, but they kick us out at 9:00, so I am trying to get as much as I can done in the limited time that I have. By the way, the machines are already pretty worn out, about .010 backlash on the table, it isn't my decision what to use, unless I want to stir the pot (I'm sure that would help with the grade)
Thanks Again - Alex

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Davis In SC

03-01-2004 22:19:59




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 Re: Fly Cutter in reply to Alex, 03-01-2004 10:09:39  
I do not reccommend using fly cutters, unless you are cutting aluminum or plastic. the shock imparted by a fly cutter is murder on spindle bearings..... Far better is a 2-inch face mill with 4 or more carbide inserts, & for smaller mills, this cutter needs to be of the positive rake kind. It will remove metal faster, & with much less wear & tear to your machine.



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kraigWY

03-01-2004 15:02:59




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 Re: Fly Cutter in reply to Alex, 03-01-2004 10:09:39  
Not near information. What is the diameter of the cutter, what are you cutting. I would recommend getting a good book on machining.



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RusselAZ

03-01-2004 11:50:23




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 Re: Fly Cutter in reply to Alex, 03-01-2004 10:09:39  
Lots of variables to answer your question. What kind of cutter tip, how heavy is your mill, how wide a cut or the face width is. Do you have cooling solution for the cutter? .030 is a pretty good cut and 310 RPM will help keep the cutter from loosing it's edge from heat.

Machineing is quite a slow operation, all things considered. It makes a good time to watch some TV in the shop. What are you building?

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Ray,IN

03-01-2004 19:14:01




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 Re: Re: Fly Cutter in reply to RusselAZ, 03-01-2004 11:50:23  
Unless you're running your own business, what's the rush anyway? Like the guys have said, you must supply much more information to receive a knowledgable answer.



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ray

03-02-2004 06:53:00




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 Re: Re: Re: Fly Cutter in reply to Ray,IN, 03-01-2004 19:14:01  
.030 is a lot more material than I remove with a fly cutter. I like to use the power feed when flycutting -- (I only flycut for surface finish).

I usually limit the material removal to under .010 per pass and shoot for surface finish not the fasted rate of material removal.

Machinery hand book will have feeds & speed charts for you.



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Ray,IN

03-02-2004 20:45:31




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 Re: Re: Re: Re: Fly Cutter in reply to ray, 03-02-2004 06:53:00  
Alex, As Ray said fly cutters are hard on milling machines; you have already noted the backlash. I usually used a planer(shaper) to ready pieces for the surface grinders. It's much quicker and less expensive than a milling machine. If you go to work in a job shop you'll soon learn saving time is very important to keeping that job. The first lesson to learn is the old adage "do it right the first time", the second, "time is money". Concentrate now on the first lesson, the second will come with experience. Good luck with your studies.

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