Originally Posted by RAYLEE29
whilst i agree with what you say it is a known practice to run reamers backwards in some situations doing so can give a tighter hole size especially if the reamer is new and could cut oversize due to being too keen obviously you need to know what your doing so unless your an experienced engineer dont try it at home
A reamer can't cut oversize unless its in the hands of an ape. That's the whole point of a reamer, to accurately make a hole to specified size. And I stand by my comment that a reamer should never be turned backwards, ever!