Diamond Cup Wheels and Grinding Heads

United Diamond Tools stock a large range of diamond cup wheels in both 5" and 7", so if you need to grind some concrete or have some touch up work to do we have the diamond disc to help.

For a guide on use, see at the bottom of the page.

Spiral grinding wheels are for general purpose grinding of masonry and concrete. The 24 segment Turbo wheels are less aggressive than the 12 segment wheels, and will last longer, but have a higher initial price.

Arrow cup wheels have a segment with a sharp leading edge for slicing, grinding and scrapping at the same time. This makes them aggressive, and ideal for glue removal and quick removal of thick layers. The segment placement also allows for maximum life. Used for general grinding as well as adhesive, epoxy and paint removal.

Rhomboid cup wheels are designed to remove glue, mastic and paint from soft or abrasive concrete. They have an aggressive segment design, which provides fast grinding. Although the segment is smaller than normal cup wheels, these  cup wheels can provide fast grinding speed and outstanding performance. More segments means the cup wheel will last longer, but will have a higher initial price.

The colour codes for the rhomboid cup wheel bonds are:
Pink is a soft bond for hard concrete.
Blue is a medium hard bond for medium concrete.
Black is a hard bond for soft concrete (although two of our wheels are blue for hard).
Then different grits are available in each hardness range.

PCD cup wheels feature extremely rough diamond particles for fast removal of thick and sticky compounds like paint, epoxy, mastic, adhesives, urethane and residues. They are more aggressive and longer lasting than standard diamond cup wheels. They are commonly used when conventional diamond cups will not grind the material quick enough or they tend to get clogged up. PCD cup wheels will not load up or smear the coating like a conventional diamond cup wheel, but do leave a rougher finish.
More diamonds mean a higher initial price. Can be used wet or dry.

Grinding plates in various sizes are also available.

4" Diamond Cup Wheel - Premium

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DBS4CUPCON

High quality Korean Arrow cup wheel for Granite & Concrete.

6.0mm segment thickness

M14 Thread suits most small angle grinders

5" Diamond Cup Wheels - Premium

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DBS5TURBOGRINDSB F, M or C

High quality Korean turbo cup grinding wheel with a very soft bond for hard concrete

Available in fine, medium and coarse.

7/8" (22.23mm centre)

5" Diamond Wheels

125mm/5"

DBS5SEG12

$120

175mm/7"

Trade series $50

All 7/8" (22.23mm centre)

7" TURBO DIAMOND CUP WHEEL

24 SEGMENT

M14 OR 22MM THREAD

DBS7SEG24

$150

All 7/8" (22.23mm centre)

CONCRETE GRINDER HEAD 200MM DIAMETER

GRINDING HEAD

200mm/8" 

Asphalt or Concrete

$180

250mm/10"

Concrete Premium

$440

All 7/8" (22.23mm centre)

7" ARROW DIAMOND CUP WHEEL 25/30 GRIT MEDIUM BOND

 

MEDIUM BOND for medium concrete

#25/#30 Grit

DBS7ARROW6GREEN

$110

All 7/8" (22.23mm centre)

 

7" ARROW DIAMOND CUP WHEEL 25/30 GRIT HARD BOND

HARD BOND for Soft Concrete

#25/#30 Grit

DBS7ARROW6PINK

$110

All 7/8" (22.23mm centre)

7" RHOMBOID CUP WHEEL MED/HARD BOND 12 SEGMENTS

7" RHOMBOID CUP WHEEL

For medium concrete

#16 GRIT or #30 GRIT

12 SEGMENTS

DBS7BLUE/16/12SEG or DBS7BLUE/30/12SEG

$90

All 7/8" (22.23mm centre)

7" RHOMBOID CUP WHEEL SOFT BOND 12 SEGMENTS

7" RHOMBOID CUP WHEEL

For hard concrete

#16 GRIT or #30 GRIT

12 SEGMENTS

DBS7PINK/16/12SEG or DBS7PINK/30/12SEG

$100

All 7/8" (22.23mm centre)

7" RHOMBOID CUP WHEEL SOFT BOND 6 SEGMENTS

7" RHOMBOID CUP WHEEL

For hard concrete

#16 GRIT or #30

6 SEGMENTS

DBS7PINK/16/6SEG or DBS7PINK/30/6SEG

$90

All 7/8" (22.23mm centre)

7" RHOMBOID CUP WHEEL MEDIUM BOND 6 SEGMENTS

7" RHOMBOID CUP WHEEL

For medium concrete

#16 GRIT or #30

6 SEGMENTS

DBS7BLUE/16/6SEG or DBS7BLUE/30/6SEG

$90

All 7/8" (22.23mm centre)

7" RHOMBOID CUP WHEEL HARD BOND 12 SEGMENTS

7" RHOMBOID CUP WHEEL

For soft concrete

#16 GRIT

12 SEGMENTS

DBS7BLACK/16/12SEG

$110

All 7/8" (22.23mm centre)

7" RHOMBOID CUP WHEEL HARD BOND 6 SEGMENTS

7" RHOMBOID CUP WHEEL

For soft concrete (black or blue)

#30 GRIT

6 SEGMENTS

DBS7BLACK/30/6SEG

$110

All 7/8" (22.23mm centre)

5" & 7" PCD CUP WHEELS

 

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5"  - 6 or 12 diamonds - $90/110 each

7"  - 6, 8 or 18 diamonds - $90/$100/$120 each

All 7/8" (22.23mm centre)

Please see our "Contact Us" page (here) for Australia wide shipping information.

A Guide to Concrete Grinding:
While this introduction is basic only, it does give you a few ideas and considerations in regards to grinding concrete.

Concrete grinding is the process of removing high points, contaminants, and loose material from a concrete surface using a grinding machine. When grinding concrete, the bond of the diamond cup wheels should normally be the opposite of the concrete, ie use a soft bond on hard concrete, and a hard bond on soft concrete. Use a larger diamond grit (lower number) for faster removal of concrete and for harder concrete.

Grinding hard concrete does not produce much dust, and it is usually soft and non abrasive. The diamonds cut, blunt and break as normal, but the metal bond surrounding them is not worn away easily without the dust, so the diamonds are not exposed as much as with soft concrete. The diamond segment glazes over and stops working and rubs on the floor instead of cutting it. You can use larger diamonds (around 20 grit) to increase dust production. Also, reduce the surface area with fewer segments to increase the weight per square centimetre.

Grinding soft concrete usually produces sufficient gritty, abrasive dust that will wear away the bond and expose the diamonds adequately. In fact, too much dust can cause the grinding wheel to wear too fast, so vacuum up excess dust. Reduce the weight on the wheel or increase the surface area with more segments to reduce the weight per square centimetre.

Inspect your grinding discs regularly to make sure diamonds are exposed adequately  and that it is not overheating . Even the best discs will perform badly if used in the wrong application.

4 steps to grinding a concrete floor

  1. Know the Surface – A diamond grinder is suitable for removing light, thin layers, not aggressive profiling and shaping.
  2. Prepare the surface – If the floor has some coatings on it (even small patches), these need to be removed before grinding. One run over is not enough, and proper surface rehabilitation must be done over several steps, each step graduating to the next to ensure a smooth finish to the floor.
  3. Select the correct diamond disc – Each particular floor is going to dictate your choice of diamond disc. There are a number of things to consider which diamond segment is appropriate.
       - The bond is the material that initially holds the diamonds in place, but also wears away to expose the diamonds. A hard bond is best when dealing with abrasive material like soft concrete or rain-damaged pavement. Medium bond tends to perform poorly with hard materials, but wears away more quickly on abrasive materials. Soft bonds are ideal on hard materials because it wears away quickly, exposing a layer of diamond to grind the surface.
        - Grit is the diamond size in the bond, and ranges from coarse (16-40 grit) to medium (70-80 grit) to fine (140-150 grit). Start with a coarse grit (16-30 grit) to remove the uneven areas. Double the grit size with each stage, gradually breaking down the surface irregularities until the surface is sufficiently smooth.
       - The shape of the diamond segments used has an impact too. Arrow heads have sharp leading edges for slicing and are effective for glue removal. Square segments have a long leading edge, so are ideal on uneven concrete. Round headed diamonds have a subtle leading edge so are perfect for working with finer grits.
  4. Use correct grinder weight – The weight on the machine can affect the wear and tear on the machine, as well as effectiveness of grinding. Heavier pressure is more aggressive on the surface, where as lighter pressure is less aggressive. On some grinders, you can add ballast weights if needed

Disclaimer: the information on this website is provided in good faith and believed to be reliable and accurate at this time. However, the information is provided on the basis that the reader will be solely responsible for assessing the information and its veracity and usefulness. UDT shall in no way be liable, in negligence or howsoever, for any loss sustained or incurred by anyone relying on the information, even if such information is or turns out to be wrong, incomplete, out-of-date or misleading.