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GIDCO
140 Algonquin Parkway
Whippany, NJ 07981 USA
 973 884 2500
 973 884 0392
info@gidco.com
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How are these products made?
Diamond and CBN coated mandrels are manufactured by a newly developed coating system. This system insures absolute uniformity of coating and repeatability among products. In addition, this system is economical, as reflected by the low cost of these products.
What are the shanks made of?
All shanks are hardened and ground steel, assuring the user of concentricity without a need for trueing before use.
On what materials is diamond used?
Diamond is usually used on green or sintered carbide, ferroceramics, carbon, glass, reinforced plastics, quartz, sapphire, and other non-metallics.
On what materials is CBN used?
CBN is generally used on hardened steels, usually 40 Rockwell C or over. It is used on high carbon-high chrome, high speed, tool and die, and stainless steels. It also finds use on super alloys and cast irons. CBN mandrels are identified by a copper dot on the end of the shank.
What diameter do I select?
75% to 80% of the hole diameter is ideal.
Is coolant required?
A coolant is not required but if available and practical it can only assist the grinding operation. Try to use an oil base coolant for CBN mandrels.
What feeds and speeds are suggested?
Feeds and speeds are very dependent on the material being ground as well as the equipment used. They may require some experimentation. Usually 2000 to 3500 surface feet per minute (610 to 1067 meters per minute) works best. About .0002" (.0051mm) to .0005" (.0127mm) feeds are used, depending on the material and the grit size.
What grit size do I select?
Use 120 grit (FEPA 151) for stock removal. If the finish of the 120 grit (FEPA 151) is not acceptable, use 220 grit (FEPA 76). For better finishes use a sparkout pass or increase RPM. Mandrels below .050" (1.27 mm) are not available in 120 grit (FEPA 151).
What are some grinding hints?
Use rigid spindles, keep tool overhangs as short as possible, and try not to clear the workpiece with the mandrel (allow about one-half of the wheel to remain in contact with the work at the end of the stroke).
What about shank sizes and relief (R)?
If the size you require is available in more than one shank diameter, select the larger diameter for more rigidity. All part numbers ending in L offer more relief (R). Use these only if required as they deflect more easily.
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