Reading a wood cutting blade specification

In summary, the grinder spacer flange nut with a 16 mm center diameter is not safe to use with a 20 mm blade. The spacer is used to center the saw blade on the spindle while the flange nut is being tightened. The flange nut must be big enough to retain the 20 mm blade. The blade also has a 72 teeth per inch total and a diameter of 4 inches. It is made of HSS (High Speed Steel) material and is designed to be used with a grinder, but it is not recommended to use handheld grinders without a guard. It is important to carefully consider the blade specifications, including the number of teeth, shape, and application, before use.
  • #1
abdulbadii
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TL;DR Summary
How to read and understand a wood cutting blade specification
How do we read and understand a wood cutting blade specification (e.g. below) ?
Is the grinder spacer flange nut for 16 mm center diameter metal cutting disc can safely be used for 20 mm one of such blade?
main-qimg-21e08f906878a5ef464abfbb23d23111-lq.jpg
 
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  • #2
abdulbadii said:
Is the grinder spacer flange nut for 16 mm center diameter metal cutting disc can safely be used for 20 mm one of such blade?
The spacer is NOT used with a 20 mm spindle.
The spacer is used when the spindle is 16 mm.
The spacer is used to center the saw blade on the spindle while the flange nut is being tightened. The flange nut must be big enough to retain the 20 mm blade.
 
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  • #3
72T = 72 Teeth per inch total around the blade
4" = Diameter in inches
1.1mm = not sure on this, either blade thickness OR kerf width (width of the cut)
20mm = bore (central hole) diameter

HSS = blade material, High Speed Steel
 
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  • #4
abdulbadii said:
...grinder ... cutting disc can safely be used
I cannot really add anything about the original question, but ... well, these kind of saw blades just cannot be used safely on a (handheld) grinder.

Especially in the frequently used configuration, without the guard.
 
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  • #5
Tom.G said:
72T = 72 Teeth per inch
Think more carefully about this.
 
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  • #6
Rive said:
I cannot really add anything about the original question, but ... well, these kind of saw blades just cannot be used safely on a (handheld) grinder.
Wait, what?

abdulbadii said:
Is the grinder spacer flange nut for 16 mm center diameter metal cutting disc can safely be used for 20 mm one of such blade?
What in the world are you trying to do?
 
  • #7
berkeman said:
Wait, what?
link (sorry, members only - but the excerpt and the picture tells everything you need to know).

There are ways to (safely) use grinders with saw blades, but I think it's better to have a warning here.
 
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  • #8
Rive said:
link (sorry, members only - but the excerpt and the picture tells everything you need to know).
Holy Crap! Here, hold my beer for a minute...
 
  • #9
Battlebots?
 
  • #10
Tom.G said:
72T = 72 Teeth per inch

Averagesupernova said:
Think more carefully about this.
Oops! You're right. That is a TOTAL of 72 Teeth around the blade.
Corrected.

Thanks for the catch!
 
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  • #11

FAQ: Reading a wood cutting blade specification

```html

What do the numbers on a wood cutting blade mean?

The numbers on a wood cutting blade typically indicate the blade's diameter, the number of teeth, and the arbor size. For example, a blade labeled "10 x 60T x 5/8" means it has a 10-inch diameter, 60 teeth, and a 5/8-inch arbor hole.

What is the significance of the number of teeth on a blade?

The number of teeth on a blade affects the quality and speed of the cut. Blades with more teeth (e.g., 60T) provide a smoother, finer cut and are ideal for finish work, while blades with fewer teeth (e.g., 24T) cut faster and are suitable for rough cuts or ripping wood.

What does the kerf of a blade refer to?

The kerf of a blade refers to the width of the cut that the blade makes in the material. A thinner kerf means less material is removed, resulting in less waste and requiring less power from the saw. Kerf width is an important specification for ensuring compatibility with your saw and the type of work you are doing.

How does the hook angle of a blade affect cutting performance?

The hook angle, or rake angle, is the angle of the teeth relative to the center of the blade. Positive hook angles (teeth leaning forward) are aggressive and cut faster, suitable for ripping. Negative hook angles (teeth leaning backward) provide more control and are better for crosscutting and minimizing tear-out in delicate materials.

What materials are wood cutting blades made from, and why does it matter?

Wood cutting blades are typically made from high-speed steel (HSS), carbide-tipped, or sometimes diamond-tipped. HSS blades are cheaper and good for general-purpose cutting. Carbide-tipped blades are more durable and stay sharp longer, making them ideal for frequent use and harder woods. Diamond-tipped blades are used for cutting extremely hard materials but are less common for general woodworking.

```

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