Acer Supra 818PD, Operation Manual

Page: 47 / 238

818~2040 PD
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5-19
5.9 PERFORMANCE COMPARISON AMONG VARIOUS
GRINDING WHEELS
Below table shows various grinding wheels performance.
Performance comparison among various grinding wheels
Symbol Description:
◎
Excellent,
○
Good,
△
Poor,
╳
Bad
Grinding Wheel Type (Abrasive and
production method)
Abrasive
Wear
Resistance
Abrasive
Spacing
Coolant
Effect
Dressing
Effect
CBN, DIA (resin, metal, electrolytic iron)
◎ ◎
╳ ╳
CBA
◎ ◎ △ △
AG, CA (ceramic)
△
╳
○ ○
A, GC (ceramic porosity) △ ◎ ◎ ◎
5.10 SELECTING GRINDING WHEEL
Selecting a grinding wheel for deep cutting with low speed feed:

ABRASIVE TYPE: Use high hardness and semi-brittle abrasive. For high alloy tool steel, it
is suggested to use the GC abrasive with high hardness that reduces wear and extends
service life.

GRAIN SIZE: Grain size can be finer by 2-grade when comparing with that of general
surface grinding.

BOND TYPE: Normally an extra soft bond type is suggested. For high-tensile strength
materials, a slightly hard bond type should be used.

STRUTURE: When selecting the abrasive percentage 32%~36%, for finer grain size, the
narrow part of continuous abrasive spacing can be compensated by coarse structure.
The selection of porous structure may ensure better dressing effect and increased
coolant effect.