(JDRDIATOOL@163.COM)Diamond blade,polishing pad, hole saw,drill bit, grinding wheel, cutting tools

The Pregnant Diamond Metal-Chip Polishing Pads, flexible or rigid, one of our patent pending products, a serial of high capability pads, in available from grit 30#, 50#,100# and 200#, can be used by wet or by dry. They can be applied to excellent fabrication of marble, concrete and granite. They are perfect at polishing concrete floor by dry. Everyone who has used them likes the combination of aggressive and long lasting performance MD Wet/Dry Flexible Polishing Pads, 2.2mm thickness, DN Style  Diamond metal pad  Grit Loop Velcro  Color Product Number               3"×2.2mm 4"×2.2mm 5"×2.2mm 6"×2.2mm 7"×2.2mm 30 OLIVE GREEN 3DN2MD0030 4DN2MD0030 5DN2MD0030 6DN2MD0030 7DN2MD0030 50 BLUE 3DN2MD0050 4DN2MD0050 5DN2MD0050 6DN2MD0050 7DN2MD0050 100 YELLOW 3DN2MD0100 4DN2MD0100 5DN2MD0100 6DN2MD0100 7DN2MD0100 200 ORANGE 3DN2MD0200 4DN2MD0200 5DN2MD0200 6DN2MD0200 7DN2MD0200...

Symptom:Loss of diamond segment Cause:a.diamond core drill bit too hard for the material it is drilling, causing it to pound and fatigue.            b.Overheating due to insufficient water for cooling and flushing.            c.Machine setup is not rigid or loose material is in the cut and the bit segment hangs.            d.Shooting cable, when drilling pre-stress. Remedy:a.Use a softer bond for diamond core drill bit if possible.  Increase motor RPM if possible.              b. Increase water flow to where slurry is milky and flows easily.              c.Tighten anchor, check vacuum system for proper vacuum pressure.              d.Use a bit with more segments, such as a  pre-stressed diamond core bit Concrete core drill bit

Cause:a.diamond core drill bit  is too hard for the material being drilled.             b.Drill Machine setup is not rigid. Remedy:a.Use a softer bit if possible. Increase motor RPM.              b.Tighten anchor, check vacuum system. diamond core drill bit

Always secure the drill rig either with a mechanical anchor, vacuum system or by use of the jack screw. NEVER stand on the base and drill without anchoring. Level the drill rig by use of the base leveling screws, and a small level attached to the column permanently or by a magnetic strip on the level. This procedure will ensure a perpendicular hole. Never let the bit spin in the hole without applied pressure. This will cause the diamonds to round off and the bit segments will heat and glaze over. Turn on water before starting the drill motor. Otherwise, the water jacket seals heat up and become brittle, losing water. When your bit encounters steel (rebar), relax pressure about 1/3 and allow the bit to cut at its own rate. DO NOT PUSH THE BIT. Some operators turn the water down after exiting the steel to sharpen the bit. If you engage in this practice, turn the water back up once the bit is sharpened. When drilling high PSI concrete or concrete with very hard aggregate (i.e., ri...

Moh’s Range                       Description                                  Aggregates 8-9                                     Citically Hard                               Flint, chert, trap rock, basalt 6-7                              ...

Compressive Strength Concrete slabs may vary greatly in compressive strength, measured in pounds per square inch (PSI). Most concrete roads are 4,000-6,000 PSI, while typical patios or sidewalks are about 3,000 PSI. Concrete Hardness PSI Critically hard                 8,000 or more Hard                                      5,000 – 8,000 Medium                                 4,000 – 6,000 Soft                                      3,000 or less concrete ...

Size of the Aggregate The size of aggregate affects diamond blade performance. Large aggregates tend to make a diamond blade cut faster. The most common sizes of aggregate are: Pea Gravel………..                                       Variable in size,  or less in diameter ¾”…………………….. usually 3/8”                                                      Sieved size 1-1/2”……………….                         ...