OPERATING
10 – English
Grinding guide Diamonds
Background
The diamond segment comprises usually of two
components:
•
Diamonds (also called diamond crystals or corn).
Changing the size of the diamonds or corn will change
the coarseness or fineness of the scratches after the
grinding process.
•
A bonding agent (metal or plastic). Powder is mixed
and suspended in a metal or plastic bonding agent. If
metal is used as a bonding agent, the finished product
is called metal-bonded or sintered diamond segment.
If plastic is used as a bonding agent, the finished
product is called plastic-bonded diamonds or
polishing disc. By changing the hardness of the
bonding agent, you can change how quickly or slowly
the diamond abrasive is worn down.
General Principles
General rules for using diamond tools when grinding
follow below. As with all rules, there are exceptions or
occasions when they do not apply.
Diamond grit size
Changing the size of the diamond grit to a smaller particle/
grit size will effect the performance of the diamond tool in
the following ways:
•
Create a finer scratch pattern.
•
Increased service life of diamond tools.
The opposite will occur when changing to a larger
particle/grit size.
Binding agent
Increasing hardness of bond will:
•
Create a finer scratch pattern.
•
Increased service life of diamond tools.
•
Decrease production rate.
The opposite will occur when making the metal or resin
bond softer.
Number of diamond tools under the machine
An increased number of tools under the machine leads to:
•
Less pressure on each individual tool – less wear on
the diamond tools.
•
Reduce load on the machine and cause the grinder to
draw less current.
•
Create a smoother scratch pattern (particularly on soft
floors).
The opposite will occur when decreasing the number of
segments under the machine.
Summary of diamond principles
The diamond tools must be worn in order to give a high
grinding efficiency. The wear on diamond tools can be
affected by the following factors:
•
Pressure.
•
Hardness of bond.
•
Diamond grit size.
•
Number of segments under the machine.
•
Adding an additional abrasive (e.g. sand, silicone
carbide) on the floor will increase wear.
Generally, the faster a diamond tool is worn down, the
better the grinding efficiency. Changing the factors above
can also change the following results:
•
Scratch pattern.
•
Current draw of machine.
•
Flatness of floor (see next section).
•
Ease of operation.
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