Rottler HP 7A - Productivity; Single Step Honing; Two Step Honing; Step Two

Section 5 Operating Instructions HP7A Manual
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5-5
Step One:
Use part number 514-9-14J (270/325grit) diamond stones. In ROUGH MODE use a roughing load of
50% and a nishing load of 20%. Hone the cylinder to size.
Step Two:
Use part number 514-9-14L for 5 strokes in each cylinder. You can use the PLATEAU MODE 1 with a
20% load setting. Caution do not hone longer than 5 strokes or shorter than 5 strokes. This will affect your
overall nish.
Step Three:
After using the 514-9-14L stones install the 514-9-14H brushes for plateau nishing. Use PALTEAU
MODE 2 and brush each cylinder 3 strokes.
Productivity
Whether using vitried or diamond abrasives, the honing process should be studied to maximize the
productivity of the work center while providing the desired end result. Following is an example of two
different ways to accomplish the same end result of an 18-22 Ra non-plateau nish. The customer
requires .003 in./.07mm stock removal for honing after boring.
Single Step Honing
Process: ROUGH MODE
Abrasive: Diamond 500 Grit.
Set machine stop to hone to size. 60 strokes per minute. Set the roughing load at 85%. Set the nishing
load between 25 and 35%. At .0003 in./.007mm per feed out a stock removal rate of .0015 in./.038mm
per minute is achieved. The result is 2 minutes of honing time per cylinder.
During this time the machine is running unattended allowing the operator to accomplish other tasks.
Rottler no longer recommends a single step honing process to nish engine cylinder bores.
Total honing time for a V8 block = 16 minutes.
Two Step honing
Step One:
Process: ROUGH MODE
Abrasive: Diamond 270 Grit
Set Feed Ring to leave .0005” / .01mm maximum for second honing process. 60 Strokes per Minute.
70% Roughing Load and 30% Finish Load. When using the precision hone head you will achieve .003” /
.076mm per minute stock removal. The result is 55 seconds of honing time per cylinder. During this time
the HP7A is running unattended allowing the operator to accomplish other tasks.
Honing time for a V8 block = 7.3 minutes
Step two:
Process: FINISH MODE
Abrasive: Diamond 500 Grit
Set Feed Ring to hone to size. 60 Strokes per Minute. 70% Roughing Load and 30% Finish Load. .
When using the precision hone head you will achieve .0015” / .038mm per minute stock removal. The
result is 24 seconds of honing time per cylinder.
Honing time for a V8 block = 3.2 minutes
Total honing time for a V8 Block with a Two Step Process = 10.5 minutes