Grinding Shoes

We carry a range of diamond grinding shoes to suit floor grinders.
Our high-quality metal shoes are compatible with other grinding machines from different manufacturers.
Suitable for wet and dry grinding

Redilock Shoes (suit Husqvarna machines):

Redi Lock Single Segments – ideal for lighter, single phase machines.

Tyrolit H2 Gold #25 single segment - W shaped. Soft/medium bond for hard concrete
Tyrolit Redilock H4 Brown #80 single segment - W shaped. Soft/medium bond for hard concrete
Tyrolit Redilock X2 Gold #25 single segment - W/M shaped. Special soft bond for extremely hard concrete
Tyrolit Redilock X42 Brown #80 single segment - W/M shaped. Special soft bond for extremely hard concrete
All $33 each incl GST

Redi Lock Double Segments – ideal for heavier, often three phase machines.

Tyrolit H2 Gold #25 double segment - W shaped. Soft/medium bond for hard concrete
Tyrolit Redilock H4 Brown #80 double segment - W shaped. Soft/medium bond for hard concrete
Tyrolit Redilock X2 Gold #25 double segment - W/M shaped. Special soft bond for extremely hard concrete
Tyrolit Redilock X42 Brown #80 double segment - W/M shaped. Special soft bond for extremely hard concrete
All $45 each incl GST

Coffin shaped. Squarer segments have a long leading edge, so are ideal on uneven concrete.

For hard to medium concrete
Premium quality (all Korean)
Rediloc Shoes #25 /30 grit   
Rediloc Shoes #50 /60 grit
Rediloc Shoes #100 grit

All $55 each incl GST each
(or $450 incl GST per box of 9 shoes)

Arrow shoe, two segments
12mm height, #25 grit.
Bond - medium
All $45 each incl GST each
(or $360 incl GST per box of 9 shoes)

Plate:
250mm Cub grinder plate with nine Redilock shoe slots.
$250 each incl GST

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Lavina Quick Change Grinding Shoes:

We use Lavina quick change diamond grinding shoes (III) on our Cub grinders.
We can supply a plate to suit the grinder, and also can sell the Lavina shoes separately.

Plate:
250mm Cub grinder plate with six quick change shoe slots
These have tapering slot and a rare earth magnet to hold each of the quick change shoes firmly in place.
$250 each incl GST

Quick Change Shoes:
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.
#25/30 is the coarsest grit, so it is for first pass grinding. Even if you wish to achieve a #120 finish you still need to first start on this grit simply because the other grits will struggle to break through the top layer of concrete. For floor prep and epoxy flooring, most times the rough finish from a #25/30 is actually preferable. For this reason this grit tends to sell the most.
X Series - one segment $40 each incl GST
Two segments $50 each incl GST (available medium and hard, #25/30, #50 and #140)

Super hard bond is for very soft concrete. Maybe it's due to the sand type in the Perth region but whatever it is, we find this bond works well and lasts decently. Our normal hard bond for some reason tends to wear a bit too fast on soft and relatively green concrete in Perth, despite the general rule that Perth concrete is harder than that of the east coast. 
Two segments $65 each incl GST

Epoxy/glue etc removal:
Arrow Shoe: 2 x arrows per segment, #16 soft bond for very hard concrete, for removal of glue, epoxy etc
$50 each incl GST
Arrow shoes have a segment with a sharp leading edge for slicing, grinding and scrapping at the same time. Along with their coarse diamonds, 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.
PCD Shoe: 2 x PCD per segment, for  very aggressive removal of glue, epoxy etc $90 each incl GST
(Poly Crystalline Diamond 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 shoes. They are commonly used when conventional diamond shoes will not grind the material quick enough or they tend to get clogged up. PCD shoes will not load up or smear the coating , but do leave a rougher finish. This is  ideal if you are applying another compound. But if you want a smoother surface, it maybe too rough.

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Adaptor shoes:
These shoes enable Redilock shoes to be used on a Lavina type machine, or plate.
$35 each incl GST
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Some of our other shoes in stock:

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Prices correct as of 1/4/21 but subject to change.

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

Grinding Exposed aggregate with Cub Grinder:
Some operators use half hard bond, half soft bond, to cope with the two different hardnesses in the floor.
Others use a hard bond with water. Use lots of segments, with double or triples,  to reduce bouncing.

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 shoes 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 25 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 shoes regularly to make sure diamonds are exposed adequately  and that they are not overheating . Even the best shoes 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.
    1. Select the correct diamond shoe – Each particular floor is going to dictate your choice of diamond shoe. 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 to fine. 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.
      #16 grit is very coarse for removing coatings like glue, lacquer, paint, epoxy etc
      #25 grit is for rough grinding such as levelling  and floor preparation.
      #40/50  grit is for medium grinding applications
      #80-#100 is for fine grinding
       - 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.
       - Shoes with one only segment are generally for lighter, smaller grinders eg Cub grinders, whereas shoes with two segments per shoe suit heavy three phase machines.
  3. 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. Alternatively, use less shoes, or shoes with one segment not two to increase the pressure.

Dampening the concrete before grinding, or even adding water may assist with your job. A grinding compound such as Worx+ Totally Cut Sikk or even sand can assist grinding.

If cup wheels glaze up, adding clean builders sand to the surface can open up the segments again.

Remember - every job is different. The enormous combinations of different types of surfaces, different cup wheel styles, with many different bonds and grits, plus different machines and varied operator experience means it is impossible to guess what will give the perfect result the first time. Some experimentation is often necessary to achieve the required results.

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.

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United Diamond Tools

U9, 84 Barberry Way
Bibra Lake
Perth
Western Australia 6163

Telephone: (08) 9434 6878
Mobile: 0419 901 533

Email:  sales@udt.com.au