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Maybe I'm a little out of date, but I was always taught a reamer follows the hole which is the reason for the chamfer on the front end. Obviously, within reason, it can't be running .03" out or anything silly, but dialing it to .0002" ?
Am I the only one here that uses a floating reamer holder?
Depends on the reamer.
I use cavity reamers a lot in aluminium. They do not have a cylindrical land.
It takes less than nothing for them to leave scores and swirls in the bore. The edges have to immaculate (the tiniest nick will ruin the bore) and runout has to be absolutely minimal for them to cut acceptable holes.
If OP is talking about some shitty £20 parallel reamer then sure, whatever.
But there are legitimate reasons to need this kind of accuracy. OP didn't state, so I answered his question.
Probably a penis implant for some.What is a cavity reamer?
What is a cavity reamer?
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