Rottler H85A - New Method for Plateau Honing; Method 1: 2 Step Using CBN Stones; OEM Blocks and Other Standard Duty Applications; Dart Blocks and Darton Sleeves

Section 5 Operating Instructions H85A Manual
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5-3
New Method for Plateau Honing
The new method to plateau honing uses a cubic boron nitride abrasive or what is known as CBN. This is
a very sharp abrasive that cuts very cleanly and does not tear and fragment the surface of cylinder. This
allows operator to eliminate the plateau brush step. We will dene both processes for the customers still
using ne diamond abrasive to plateau.
Method 1: 2 Step Using CBN Stones
Common applications for general duty and performance and track applications. This application can
use both cast iron rings and moly rings. We must further dene this honing process by the hardness of
material being honed. So as a rule standard OEM blocks use a softer cast iron than performance blocks
and aftermarket cylinder sleeves. For this discussion we will use the terms OEM blocks and Dart blocks/
Darton Sleeves.
OEM Blocks And Other Standard Duty Applications
Step One:
Use part number 514-9-14J (270/325 grit) Diamond abrasive. Use the Hone process with a roughing
load of 50% and a nish load of 40%. Hone the cylinder to size. If you experience out of roundness in OE
blocks due to cylinder wall thickness variations reduce the roughing load to 40% and the nish load to
30%.
Step Two:
Use part number 514-9-35B (600 grit) CBN abrasive for 4 strokes at 15% load. When plateau honing with
ne abrasive, slow the rpm down to 80 rpm. The H85 machine will adjust the stroke speed to maintain
the proper cross hatch angle during this process. Typical cross hatch angles range from 38 to 45 degrees
included angle. The H85 has a ball screw for vertical stroke and is very accurate when setting cross hatch
angles.
Dart Blocks And Darton Sleeves
Step One:
Because these blocks are harder you will need to use a rougher abrasive for the base nish, part number
514-9-14K (170/200 grit) to maintain a high enough initial RvK number to allow for some drop in the
RvK number when following with ne abrasive. Use 50% roughing load and 40% nishing load to size.
Reduce load setting if there is a problem with maintaining proper bore geometry.
Step Two:
Use part number 514-9-35B (600 grit) CBN abrasive for 4 to 6 strokes at 15% load. When plateau honing
with ne abrasive slow the RPM down to 80 rpm.
Method 2: 3 Step Using Plateau Brushes
OEM Blocks And Other Standard Duty Applications