Rottler H85A - Single Step Honing Process; Using Vitrified Abrasives

Section 5 Operating Instructions H85A Manual
www.rottlermfg.com
5-6
Step 2:
Hone to nal size using 514-9-32E 325/400 grit stones using 45% for the rough load and 35% for the
nish load.
Step 3:
Use 514-9-21H 1000 grit stones in plateau mode at 80 RPM and load set at 20% for 2 - 3 strokes.
Step 4:
Use 514-9-14H bushes in plateau mode at 80 RPM and the load set at 20% for 4 strokes.
Single Step Honing Process
There is still a call for a simple one step process where you may use one grit size abrasive and follow up
with a plateau brush for a few strokes. Typically this is done with part number 514-9-14E (325/400 grit)
diamond abrasive to size. Use 50% roughing load and 40% nishing load followed by 4 to 6 strokes in
the plateau mode at 15% load with part number 514-9-14H plateau brushes. This won’t allow for much
plateau or RvK, but it does produce a 18 to 24 microinch (.46 -.61 µm) Ra nish.
Using Vitrified Abrasives
Abrasive grades are available for most any nish you want to achieve. Two or three bond hardnesses are
available with most grits. The right bond hardness will break down gradually depending on the grit used.
Too soft a bond will lose abrasive excessively. Too hard a bond will chatter and start glazing the bore,
with rapid heating and poor stock removal.
Finer grit stones generally break down much faster than coarse grit does. They must break down quickly
to prevent the stone from loading or glazing.
Bond hardness will act differently with different cutting oils. Rottler abrasives were designed to be used
with Rottler honing oils or equivalent. In general, Rottler honing oil is of low Sulfur content. Using other
honing oils may have an adverse effect on the abrasive performance. Faster spindle rotation and light
pressures will make abrasive act harder. Faster stroke speed and heavy pressures will make abrasive
act softer.
Abrasive should wear relatively evenly and parallel to the shim support. If you encounter uneven abrasive
wear, the cause may be damaged universal drive joint, unmatched stones, or misalignment of hone drive
with cylinder bore.
Standard Vitried abrasives can not be used in synthetic or water base coolants.
Generally, lighter honing pressures are required when using vitried stones compared with diamond
stones. The ner the grit the lighter the load should be as follows.
80 Grit 40 – 60%
180 Grit 40 – 60%
220 Grit 30 – 50%
320 Grit 20 – 40%
400 Grit 10 – 30%
600 Grit 05 – 25%
See Options section in the manual for list of available abrasives.