Tool Numbering
Introduction
The number given to a tool is not defined in the tool page itself but in the machining cycle using this tool.
Consequently, the tool number can be defined:
in the Technology page of each machining cycle
in the list of operations command:
in the machining tree
in the menu ‘Optimization’.
Fixed tools can be defined in the machine file.
Pros & Cons
Numbering a tool either on the tool page or cycle page is a CAM philosophy choice, and it has very concrete impacts on the shop floor.
Principle
Tool-related numbering: T12 = Ø10 end mill, everywhere, all the time.
Machining cycle-related numbering: T12 = facing operation, T13 = drilling, etc., even if several cycles physically use the same tool.
Advantages of cycle-related numbering
1. Program readability
The tool number becomes a functional reference:
T1 = roughing
T2 = finishing
T3 = drilling
By reading the ISO code, you immediately understand what the machine is doing, not just which tool is mounted.
2. Flexibility in Modification
If you change tools (e.g., Ø10 end mill → Ø12):
The number remains the same
Only the tool behind the cycle changes
Less renumbering, fewer errors, especially on complex or reused programs.
3. Easy Reuse of Cycles
Very useful for:
Part families
CAM templates
Automation
You can reapply cycles without worrying about the overall consistency of tool numbers.
4. Improved Management of Machine Variants
If multiple machines:
Different tool magazines
Different tool lengths
Equivalent but not identical tools
The cycle retains its identity, even if the actual tool changes depending on the machine.
5. Conflict Reduction in Large Programs
In parts with:
many operations
rework
multiple setups
Cycle-based numbering avoids:
duplicates
offsets
"ghost" tools that are never called
Disadvantages (honestly)
Let’s be complete by relating disadvantages of this method of numbering:
Less intuitive for an operator highly focused on the tool store
Can lead to unnecessary tool changes if the post-processor or CAM is misconfigured
Requires methodological discipline (clear cycle names, clean comments)