Choosing the type of diamond blade (Continuous Rim, Side-Spoked, Gulleted, etc. – see Making the Cut – Diamond Cutoff Wheels), is important in blade selection, but blade thickness and diamond grit play crucial roles as well.

 

Choosing the Best Diamond Blade Thickness10 10 v2  2

A blade’s thickness (kerf) is measured at the periphery and includes the plated diamond thickness.

Blade Diameter           Blade Thickness Available

1-1/2” to 4”               1/16”, 3/32″

5” to 7”                      3/32″

8”                              3/32”, 1/8″

10”                            3/32”, 1/8”, 5/32″

12” to 14”                  1/8”, 5/32″

16”                             5/32″

 

How Blade Thickness Affects Performance

Thinner blades (1/16”) trim slightly faster and produce less dust

Thicker blades (3/32”+) trim slightly slower and produce slightly more dust

With small diameter blades (1-1/2” to 4”), making straight cuts is faster with a 1/16” blade but as more side pressure is applied when making radius/curved cuts, it’s advisable to use a thicker blade (3/32”).

Larger blade diameters 5” to 16” need to be thicker to retain their rigidity to avoid warping. 

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Choosing the Best Grit for Electroplated Diamond Blades

While there are many diamond grits available, 3 in particular (35/40, 45/50. 60/70) are used in the majority of electroplated diamond blades and tools. 

 

Diamond Grit                Characteristics 

 

30/35                      Very Rough

Diamond Blade Grit

 

*35/40*                    *Rough*

When speed of cut is important and a finished, smooth edge is of less importance. This grit will leave small nicks on the edge of gel coated parts (especially if they’re thin). Only recommended on blades 3/32” thick or thicker. If used on 1/16” thick blades, blade life will be greatly reduced.

 

40/45                      Rough / Medium

 

*45/50*                    *Medium*

This general purpose grit produces a largely nick-free finish and is recommended in 95% of all blade applications. The exceptions are gel coated or acrylic FRP laminates where a finer grit will be preferred. 45/50 grit offers a good compromise between speed of cut and finish and can also be used on 1/16” thick blades.

 

50/60                      Medium / Medium Fine

 

*60/70*                    *Fine*

Recommended for trimming gel coated or acrylic FRP laminates or when a smooth, nick-free edge is important. However, blade life is reduced compared to a 45/50 grit blade.

80/100                    Very Fine

100/120                  Extremely Fine

 

The right combination of blade type, thickness, and grit can make a big difference in your specific trimming job. If you have any questions, feel free to contact us for help.