After you have honed out the inaccuracies, you
round, and straight bore. After heat-treating the work-
must abrade every section of the bore equally. To be
piece, finish hone to correct any minor distortion and to
sure this happens, maintain both the rotating and
produce the desired finish.
reciprocating motions so that every part of the bore is
Honing produces a crosshatch finish. The depth of
covered before any grit repeats its path of travel.
cut depends on the abrasive, speed, pressure, and
If a bore will require honing to correct taper or
coolant or honing oil used. To produce a finer finish,
out-of-roundness, leave about twice as much stock for
honing as there is error in the bore. It is sometimes
you can do one or all of the following:
practical and economical to perform two honing
1. Use a finer grit stone.
operations: (1) rough honing to remove stock and (2)
finish honing to develop the desired finish. We said
2. Increase the rotating speed.
earlier that you should leave from 0.0002 to 0.001 inch
3. Decrease the stroking speed.
for finish honing.
4. Decrease the feed pressure
If a machined bore must be heat-treated, rough hone
it before heat treating to produce an accurately sized,
5. Increase the coolant flow.