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  1. #1
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    Default HM- 50 Milling Machine

    What is the would be the biggest fly cutter could this machine comfortly handle ? The reson for asking still looking at this used HM-50 he claims that he used it for facing manifolds and cylinder heads I don't think this the right tool for this job I have seen head refacer quite a large machine I suppose you could do it with several passes any thoughs on this would be most welcome David PS I don't intend to use it for this purpose

  2. #2
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    It's possible. My rule of thumb is
    Diameter of cutter (mm) = (300x surface speed)/ rpm. For steel the surface speed is around 30m/min, Al is around 80 to 90m/min. Provided the machine has a low enough speed, machining a head with a fly cutter should not be a problem.
    An Al head 150mm wide calls for around 180rpm. Using a fly cutter is going to be slow, but if trammed up correctly will give a good flat surface.

    Michael
    Last edited by Michael G; 6th May 2012 at 01:03 PM. Reason: And CI is around 15m/min

  3. #3
    Dave J Guest

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    They go down to 220rpm so I would say around 200 is it's limit.
    This is a 220mm wide plate I did a while back using the boring head as a fly cutter.

    Dave


  4. #4
    Ueee's Avatar
    Ueee is offline Blacksmith, Cabinetmaker, Machinist, Messmaker
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    Quote Originally Posted by Dave J View Post
    They go down to 220rpm so I would say around 200 is it's limit.
    This is a 220mm wide plate I did a while back using the boring head as a fly cutter.

    Dave

    Um, Dave,
    What is holding that plate down? Looks a bit scarey!

    Ewan

  5. #5
    Dave J Guest

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    Nothing scary and I would do it every day of the week if I had to.
    There where 2 x M8 socket head bolts into T nuts, and the paper is there because of the rough surface on the other side.

    The mill was only doing 220 so not fast at all, more boring waiting for it to finish as you need a really slow feed to get a good finish. It is not taking off much material, just a skim over to tidy it up.

    This was the plate finished and I did both sides as I needed it.


    Dave

  6. #6
    Ueee's Avatar
    Ueee is offline Blacksmith, Cabinetmaker, Machinist, Messmaker
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    Hi Dave,
    Now you have pointed it out, i can see the heads of the 2 bolts in the holes. When i first looked i didn't see them and was also intrigued by the paper.

    Ewan

  7. #7
    Dave J Guest

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    No worries, I needed the holes where they are but needed to be bigger for the job, so what I did was to drill them smaller and counter bore them either side smaller to hold the plate down for machining and so the bolts would fit. Once the machining was done the holes where then drilled through with a larger bit.

    I will also mention that surface finish never came from the first picture of fly cutting it. In that photo I tried dry and only got 3/4 of the way through before the HSS edge went off. So I then re cut it using a spray bottle of coolant and all went fine. I didn't want to use flood coolant as it would have sprayed everywhere, and I was soaked just by the spray bottle as it was, and so was everything in reach. A rain coat would have been handy, LOL

    Dave

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