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Finding tool centre height on a lathe
spuddevans:
--- Quote from: bogstandard on August 25, 2009, 02:17:11 PM --- There must be a reason for it, but ??????????????????
--- End quote ---
The only thing I can think of is this, would the steeper angle cause the chips to break more than create long stringers that, if boring in a confined space, may get tangled up?? maybe the angle helps to make smaller chips and so clear a bit better? :scratch:
I dont know if that's the reason, just what came into my tiny mind as I read through the thread. :scratch:
Tim
bogstandard:
Tim,
:offtopic: Having at last got the second brain cell jump started, I had another look at the end view of the boring tool.
It looks to be because of the angle of the side face of the tip. By angleing it downwards, it allows a smaller diameter hole to be bored because of the clearance angle.
John :offtopic:
spuddevans:
Ahh, that makes more sense than what I wrote.
Tim
Stilldrillin:
--- Quote from: bogstandard on August 25, 2009, 03:02:46 PM ---Tim,
:offtopic: Having at last got the second brain cell jump started, I had another look at the end view of the boring tool.
It looks to be because of the angle of the side face of the tip. By angleing it downwards, it allows a smaller diameter hole to be bored because of the clearance angle.
John :offtopic:
--- End quote ---
My thoughts, exactly....... :thumbup:
No1_sonuk:
I tend to use a centre in the tail stock.
WRT the boring bar:
One book I read suggested raising the bar above centre, then angling it to give clearance in small holes. I assume that's why boring bars are mostly cylindrical in shape, and why the boring bar holder for my QCTP has a V-groove.
Indexable bars probably just have the flats milled at a convenient angle for the minimum hole size.
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