MOUNTING
CDI Diamond Wheels are trued to the bore in the manufacturing process.  Flanges, back plates and spindle should be clean, free of burrs and run true.  By using an indicator and tapping lightly on a wood block held against the wheel, indicate the wheel until it is within .0005" of true rotation.  Tighten the flanges securely and recheck before using.  The use of permanent mounting should be practiced where convenient.

COOLANT
Coolant must be applied in the proper place or it will not cool the wheel or material being ground properly.  Coolant should always be directed so that the full flow is at the point of contact between the diamond wheel and the work piece, and in the same direction as the rotation of the wheel.  Soluble oil may be mixed with water to prevent corrosion of machine parts.  Weak solutions are recommend however, because strong alkaline solutions will reduce normal life of resin wheels.

CAUTION
When ordering Resin Bonded Wheels, specify for wet or dry grinding.  Some Resin Bonded Wheels are made for dry grinding only, and a coolant will only prove detrimental to the life  of these wheels.  All Metal Bonded Wheels must be operated with a coolant.

GRINDING SPEEDS AND FEEDS
Speed: CDI Diamond Wheels should not be run at speeds of more than 6,000 or less than 5,000 surface feet per minute.  The higher speeds are recommend for interrupted cuts and small areas of contact between wheel and work piece.
Feeds:  Avoid excessive feeds.  The following feeds are recommend for most satisfactory finish and longer wheel life:
.001" thorugh 120 grit - .0005" through 220 grit - .00025" finer than 220 grit
On finishing passes, allow wheel to "spark out" to obtain best finish.

WHEEL DRESSING AND TRUING
Due to the exceptionally free cutting properties of CDI Diamond Wheels, frequent dressing is not necessary.  They may be dressed with a soft bonded aluminum oxide or silicon carbide dressing stick.  When a beveled or gouged condition has occurred in a face type wheel, it should be taken off the grinder and the diamond section lapped on cast iron plate using 120 grit silicon carbide and water.  Straight type wheels may be trued on the grinder by using a brake type truing device or, for Resin Bonded Wheels only, by dry grinding a piece of low carbon steel until running truth is achieved.

PREPARATION & USE OF BORAZON WHEELS

Truing allows the grinding face to be properly presented to the work piece.  An untrued wheel can adversely affect surface finish, stock removal capability and wheel life. 
--Multiple point (14-40 mesh) or impregnated (40 to 100 mesh and finer) diamond dressing tools. 
--.0005" Infeed per pass (.01 MM)
--Single point & cluster diamond tools not recommended
--Finer mesh diamond allows better initial work piece finish

Truing brake or motorized dress
-Coarse grit, J to M hardness, silicon carbide or aluminum oxide wheel
--.001" Infeed per pass (.025 MM)
The truing device should be applied until contact has been made with the entire Borazon wheel grinding face.  Flood coolant should be used whenever possible.  The use of enriched solutions (5-10%) of "heavy-duty" water soluble oils is effective in extending Borazon CBN wheel life.  After truing, a resin bonded wheel must be properly dressed.

DRESSING RESIN BONDED WHEELS
Effective grinding wheel cutting performance requires a sharp abrasive grain whose cutting points are well exposed to the work piece.  Ultra-hard Borazon CBN crystals remain sharp and once the wheel is cutting well, the grinding process will keep the wheel open, exposing the crystals and virtually eliminating the need for continual dressing.  New wheels usually have a smooth grinding face since the Borazon crystals and the surrounding bond are flush to the cutting surface.  Dressing enhances grain exposure and abrades away some bond.  Prior to dressing, a wheel may seem to be "loaded", producing  poor cutting performance and work piece burning.

    Hand held aluminum oxide or silicon carbide stick
       Soft (G, H hardness)
       Fine grit (200-400 mesh)

If for some reason the wheel later produces burning and poor cutting action, the same stick can be used to reopen the wheel.