Page 13 - QR CIMAR MULTI-GRINDER

CMG/TEESIN/MAN/01/15 Compile by CJ

5. Operation Tips

5.1) Tips on Grinding Hard Concrete Floors

A soft diamond segment bond is needed to work on a hard concrete and a hard diamond
segment bond are needed for soft concrete in order to grind the concrete surface
effectively. This is because the diamond need to be exposed in order to cut well.

Wetting the concrete before grinding helps to expose the diamonds a little more. Scratch
open the surface first, then apply water and give it a little time to soak in. Broom off the
puddles and remaining water leaving the surface wet. This process makes the dust a little
heavier which cuts the matrix more to expose more diamonds.

If all else fails, put in a small amount of sand on the ground and lightly wetting it to help
further break down the bond of the diamonds.

The Rule of thumb:

 Use diamond tooling with soft bond and/or less segments for hard concrete and
increase the weight on the diamond tooling. Using coarser grit diamond may
increase the dust size and keep the tooling working.

 By turning down the vacuum so there is plenty of dust under the machine, this
will help the diamonds to expose. Careful addition of sand may also help. Don't
overdo sand, it could cause premature wear!

 Watch out for situation where there is a hard-to-grind top layer, and a soft layer
below (medium strength concrete). It is because this can wear out disc fast
because of the top layer is hard. If this occurs, use the soft bond only to grind on
the hard layer, or nearly to the soft layer, then grind the soft layer completely
separately with hard bond discs.

 Lastly inspect the tooling. If there is hardly any diamond exposed out of the
matrix, and /or the tooling is getting hot, stop and change to a softer bond, or less
segments.

5.2) Tips on Grinding Soft Concrete Floors

Grinding soft concrete requires 'hard bond' discs that resist the metal matrix being eroded
away. The sandy, gritty, abrasive dust will erode many discs abnormally fast, so be
certain to use the right disc. More than any other, grinding soft concrete is when
contractors need to be aware of the signs of rapid grinding and fast wear to stop work and
rectify the problem.

In addition, it is also important that the weight on the head of the machine is reduces as
much as possible to ensure that the sandy, gritty, abrasive dust that is rolling around
under the segments does not erode the matrix too quickly.

For technical questions, please call +65 - 66431213 11
For Products Enquiry, please call +65 - 67581211