Need pointers for drilling ETD150 - Page 3
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  1. #41
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    Quote Originally Posted by Hardplates View Post
    Looking back at the original post I would say your feeds and speeds are a little on the aggressive side, at least once you start getting deep. A 0.050" peck wouldn't be unreasonable IMO. If your cam wont output code that decreases pecking just write a few drilling cycles with the start plane a smidge about the last bottom plane.

    IIRC ETD150 is going to machine essentially the same as 4150 Q&T. That being said you might try slowing your SFM a bit, especially once you start getting deep. And don't wait for the drills to get dull, touch them up often to keep them sharp!
    I can certainly do that.

    Funny thing is that I ran 5 of these about 2 wks ago, from the same material (different bar), and it went smoothly.

    As far as using the wrong tool for the job, I don't agree with that. A VMC isn't the ideal tool for drilling concentric holes in rods, but a lathe isn't the ideal tool for the other features in the part. At the end of the day, I gotta work with what I have until I find the right lathe.

  2. #42
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    Reduced speed to 65sfm, feed to .004"ipr and the drill lived through #21 with some touching up with a stone.

    I did learn how to setup my surface grind to touch up drills, too. It's not a full radial relief, just facets more akin to an end mill but it works.

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