When to use a diamond hole saw
Published July 17, 2017


When to use a diamond hole saw

Diamond hole saws are designed to drill holes in glass, ceramics, porcelain, ceramic and porcelain tile, limestone, slate, marble, granite, stone, and fiberglass.  

Diamond hole saw drilling technique

 

Balancing cutting speed, Drill Speed, Pressure and Lubrication

The cutting speed and life of a diamond hole saw are affected by the hardness and abrasiveness of the material plus the drill speed, pressure and lubrication. Experience with a specific material quickly allows a person to determine the optimum drill speed, pressure, and lubrication to obtain the fastest cutting speed with the least effect upon hole saw life and risk of heat fractures or breakage. However, when experience is lacking, it is best to start out with a very slow drill speed, very low pressure and lots of lubrication. This starting point reduces risks to a minimum and extends hole saw life considerably.

Recommended drill speeds

Diamond hole saws

Recommended Drill Speed (rpm)

Material/Hole Saw Size

1/2"

1"

2"

3"

4"

Fiberglass

1200

700

350

250

175

Glass, Ceramic & China

800

500

250

160

125

Limestone & Marble Stone

600

450

225

130

100

Ceramic Wall Tile

600

450

225

130

100

Porcelain Wall Tile

500

375

180

125

90

Porcelain Floor Tile

500

375

180

125

90

Granite Stone

400

300

150

100

75

(Not for use on concrete or masonry, or with hammer drills)

Recommended drill head pressure

Material

Recommended Drill Head

Pressure (lbs) *

Fiberglass

10 to 15 lbs

Limestone & Marble Stone

12 to 18 lbs

Glass, Ceramic & Porcelain China

12 to 18 lbs

Ceramic/Porcelain Wall Tile

15 to 20 lbs

Stone Style Porcelain Floor Tile

18 to 30 lbs

Granite Stone

18 to 30 lbs

Material hardness and abrasiveness

Materials have varying degrees of hardness and abrasiveness. Additionally, specific man-made and natural materials can differ greatly depending upon their exact physical compositions. For example, glass varies in hardness depending upon colour and type, since various metals and minerals are added to achieve the different types and colours. Glass also has differing degrees of "temper" depending upon the specific manufacturing methods used.

The hardness and abrasiveness of natural materials, such as stone, vary by type, but they also vary significantly within a specific type. Most stones are not pure - they are mixtures of various types of rock. Granite, for example, contains various combinations of primarily quartz, feldspar, black mica and hornblende. Therefore, a specific stone type such as granite or marble, will vary significantly in hardness and abrasiveness depending upon the exact mineral composition that varies by quarry location. For example, river sand is much less abrasive than quarry sand.

Below is a table of the hardness of various materials. The table uses the standard Knoop Hardness Scale (kg/mm2). The hardest known material is diamond, with a Knoop measurement of 7,000. Tungsten carbide, used in carbide hole saws, is the hardest natural material next to diamond. However, with a measurement of 2,000, tungsten carbide is only 30% as hard as diamond.

Material

Knoop Hardness Scale

Wood - Pine

10

Copper

120

Limestone

125 - 150

Marble

140 - 180

Slate

140 - 250

Porcelain Fixtures & China

400 - 500

Glass & Ceramic

400 - 550

Ceramic Wall Tile

450 - 550

Porcelain Wall Tile

500 - 650

Porcelain Floor Tile

500 - 650

Marble Style Porcelain Floor Tile

500 - 650

Granite Style Porcelain Floor Tile

500 - 650

Granite

550 - 650

Quartz

820

CommonTool Steel

700 - 900

Tungsten Carbide

2,000

Diamond

7,000

 

Learn about how to prolong the life of your diamond hole saw

About Exchange-A-Blade diamond hole saws

Exchange-A-Blade diamond hole saws are market leaders in quality and value. They can be used to drill holes in glass, ceramics, porcelain, ceramic and porcelain tile, limestone, slate, marble, granite, stone, and fiberglass. They are available in a variety of sizes and come in a Professional Bronze Line and an Economy Green Line. All Exchange-A-Blade diamond hole saws come with a drilling template for accurate results.

 

Some content sourced at www.DiamondSure.com and www.diamond-drill-bit-and-tool.com.