Using End Mill as a Drill
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- Old Timer
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Using End Mill as a Drill
Just finished a Brian Law clock (clock 24) and I used a 1/8" up spiral router bit to do a lot of the machining and noticed something interesting. All of the 1/8" holes I programmed as drilling tool paths were slightly oversized, yet the larger holes I programmed as profile tool paths using the same cutter were the correct diameters. I took the cutter and measured it and checked it for distortion and everything seemed fine. I then put the router bit in a drill press and drilled some holes and they were all slightly oversize (say 0.001" or so). I then put a 1/8" drill bit in the drill press and drilled a hole - perfect. Has anyone else noticed this phenomenon?
Re: Using End Mill as a Drill
Mark;
Congratz on finishing your Brian Law clock, post a picture if you can, love to see it. As to the oversize drill hole, could it be you have a slightly warped router bit or maybe it's the spindle itself?
Cheers
Bob
Congratz on finishing your Brian Law clock, post a picture if you can, love to see it. As to the oversize drill hole, could it be you have a slightly warped router bit or maybe it's the spindle itself?
Cheers
Bob
Gearotic Motion
Bob
Bob
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- Old Timer
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Re: Using End Mill as a Drill
Checked for warping, dimensions and runout. Same results on drill press so it must have something to do with a hole being drilled with a flat bottom cutter. I will post a photo of the clock on the "Ticker" board when I put the finishing touches on it.BobL wrote: Mark;
Congratz on finishing your Brian Law clock, post a picture if you can, love to see it. As to the oversize drill hole, could it be you have a slightly warped router bit or maybe it's the spindle itself?
Cheers
Bob
Re: Using End Mill as a Drill
That, or chip clearance. (Square nose bits are known to wobble when plunge cutting like that though.)Same results on drill press so it must have something to do with a hole being drilled with a flat bottom cutter. ...
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- Old Timer
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Re: Using End Mill as a Drill
I think Nate is correct. Slight wobble with no guiding point would be my best guess.
Re: Using End Mill as a Drill
Sounds logical to me..
Art
Art
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