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What is RPRG? What is the tool diameter correction value? (Thread Mill)
RPRG stands for tool radius correction value, which is a number used to tell the machine, "What is the radius of the tool?"
The machine tool calculates the actual distance the spindle moves based on this number for the machining program.
With thread mills, the following adjustments can be easily made without changing the program by using diameter compensation.
・If the tool diameter correction value is increased, the finish of the internal thread will be smaller.
・The smaller the tool diameter correction value, the larger the internal thread finish.
Since the thread mill is a cantilevered tool like the end mill, it may not pass the gauge inspection due to the influence of tool deflection and deflection during machining.
At that time, by using diameter correction, it is possible to easily make adjustments until the gauge is passed without changing the program.
In the NC program creation application "ThreadPro" for thread mills provided by OSG,
Along with the program, the RPRG for machining the thread is displayed. First of all, it is a value that you should try first.
* In the solid type (for internal thread ), the RPRG when machining the minimum machining diameter (thread accuracy 5H) is displayed on the actual product.
By using RPRG, it is possible to shorten the adjustment work time until the gauge is passed.
What is RPRG?
R = radius and PRG = program, which are words that express the programming radius.
This is the tool radius correction value (reference value) required for thread milling, and is displayed on the tool or case.
It is calculated when machining the minimum machining diameter of internal thread .
If you want to machine a size other than the "minimum machining diameter", you will need a number smaller than the displayed RPRG.
In that case, please use the program creation app Thread Pro.
Aiming for the thread accuracy of the RPRG display
Metric Thread ISO:5H Unified ANSI:3B
Easy to adjust for gauge passing
Adjustment work can also be performed without changing the program, using only the value of RPRG, so it is efficient.
* The tool diameter correction value of the threadmill for tapered screws for pipes is the value of the small end diameter of the tool.
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A: Effective diameter reference dimension B: internal thread ISO-5H C: internal thread ISO-6H D: WHEN RPRG VALUE IS ENTERED (INPUT VALUE: 3.806) E: When tool radius is entered (input value: 3.85) F: Tool radius
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