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Most indexable drill I’ve tried leave a nasty bulge at the center of the bottom which is a non-idead start for the second drilling operation and thus requiring the use of a spot drill. Is there an indexable drill (U-drill) series that would leave a dent instead of a bulge so that I can leave the spot drilling out?
You don’t say much about you operation as in the size you are trying to achieve
Iscar and other manufacturers do have a flat bottom drill head that does what you describe. Iscars go up to about 1-1/4 dia.
iscars designation for this is FCP 1260. this could also be made for you in a specific size under 1.280 dia. if the size you want is no there
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