Grinding Guide; Grinding Heads; Diamond Segments - Husqvarna PG 680 Operator's Manual

Grinding heads

There are 2 different grinding head options:
• Spring steel heads - designed more for finishing or
lighter grinding applications.
• Conventional / Demolition heads⎯designed for heavy
duty preparation grinding where an extremely robust
system is required. (additional accessory)
Spring steel heads
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1 Drive hub
2 Spacer plate
3 Cushion ring
4 Spring steel spring
5 Silicone spring
6 Spacers
7 Head plate
8 Head lock
Between the head plate and head mate are a series of
spacers, silicon spring and the spring steel spring which
give shock absorption and flexibility in the system.
The spring steel heads are made up of a series of
spacers, a silicone spring and a single spring steel spring.
Combined these give flexibility and shock absorption to
the system.
Unlike the heavy removal heads, the spring steel heads
are able to move in a more flexible manner with out
moving parts due to the spring steel design.

Diamond segments

The following are guidelines regarding diamond
segments grinding applications. As with all guide lines
there are always exceptions to the rule.
General
Diamond abrasives usually consist of 2 components:
• Diamond powder (also known as diamond crystals or
grit). By changing the size of the diamond powder or
grit, we can change how coarse or fine the scratches
will be that are left behind from the grinding process.
• A binding agent (metal or resin). Diamond powder is
mixed and suspended in either a metal or resin
binding agent. When suspended in a metal binding
agent, the finished product is referred to as a Metal
Bond or Sintered diamond segment. When

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suspended in a resin binding agent, the finished
product is referred to as a Resin Bond diamond
segment or pad. By changing the hardness of the
binding agent, we can change how fast or slow the
diamond abrasive will wear.
Diamond grit size
The following are general rules regarding diamond
segments in grinding applications. As with all general
rules there are exceptions or cases when it is not the
case.
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.
• Increase life of diamond tool.
The opposite will occur when changing to a larger
particle/grit size.
Binding agent
Increasing hardness of bond will:
• Create a finer scratch pattern.
• Increase life of diamond tool.
• Decrease production rate.
The opposite will occur when making the metal or resin
bond softer.
Number of diamond segments under the
machine
Increasing the number of segments under the machine
will:
• Reduce pressure on each individual diamond
segment - reduce wear rate on diamond segments.
• 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.
Wet and dry grinding
When using diamond segments wet, the following
principles apply:
• Production rates will be higher than dry grinding.
• Diamond segments will wear faster (due to presence
of slurry) and therefore, harder bonds can be used
(when comparing with dry grinding).
• Scratches from diamond grit will be deeper.
When using diamond segments dry, the following
principles apply:
• Production rates will be slower on harder materials
than if wet grinding.
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