we are trying to use the highest speed which results in the
required finish and size.
best speed for reaming is determined by the material being
reamed and the final finish desired. Normally the best speed
is around 2/3 of the recommended drilling speed for the material.
These are examples of recommended reaming speeds in common
The closer the tolerance needed, or
the finer the finish, the slower the reaming speed must be.
Reamer speed should always be slow enough so
as not to induce chatter. Chatter not only leaves an undesirable
hole finish, but is a great destroyer of reamers.
Common causes of excessive reamer wear
and/or breakage are:
1. Too fast or too slow reamer speeds
2. Too fast or too slow feed speeds
3. Reversing reamer rotation and backing
out of hole
4. Stopping reamer before going through
5. Poor alignment - reamer to hole
6. Careless handling of reamer
7. Lack of lubricant - depending upon
8. Excessive chip build-up
9. Reamer chatter
10. Failure to keep reamer cutting
(maintain steady feed)
11. Being bumped by other reamers or
Remember, reamers are PRECISION tools.
They should be thoroughly cleaned, oiled and stored individually after each use.