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 Thickness
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
*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.
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