After reading this, you will learn the IOS coding rules for boring bars!
All turning tools and insert models are composed of a set of numbers and letters. Usually these numbers and definitions are defined, and in-depth study of the coding rules can help you find the tools you need faster and more accurately.
Take the following model as an example to explain the IOS coding rules
1.The first letter indicates whether the boring bar is solid or has through-coolant capabilities.
- If it’s an “S,” it’s made of steel, which is great for general-purpose drilling or drilling on a budget.
- If it’s an “A,” it’s made of steel but has a hollow hole in it to allow through-coolant.
- If it’s a “C,” it’s made of carbide, which is harder than steel and can help dampen vibrations and achieve a better surface finish. It’s also more expensive.
2.The second letter represents the diameter of the boring bar (mm).
The 25 in the figure represents the diameter of the handle is 25mm.
3.The third letter represents the length of the shaft (from the end of the handle to the top of the blade)
This diagram shows the lengths represented by the different letters
4.Blade installation method (Fastesning mode)
"S" Screw on
"C" Top clamping
"P" Hole clamping
"D" Top and hole clamping
"M" Top and hole clamping
5.Blade shape
Usually we define: S = square blade, T = triangle blade and K = parallelogram blade
6.The boring bar lead angle is also called the lead angle
7.Blade Relief Angle
The seventh letter of the handle code represents the back angle (or clearance angle) of the blade, which also matches the second letter of the blade.
8.Hand of Boring Bar
The eighth letter represents the direction of the tool bar, whether it is a left tool bar, a right tool bar, or a centered type.
9.Cutting edge length
The last part of the code identifies the length of the cutting edge of the insert used in the tool. So, using the example at the top of the article, there is a 12 at the end, which means the cutting edge length is 12 mm.
