Return
Oversize refers to threads that are larger than the typical thread accuracy. There are various reasons for making large screws, such as plating on internal thread and anticipation of deformation due to strain when the product is heat treated. In Tap , the Tap side needs to be slightly larger (oversize) when machining oversized threads, but in a thread mill, the same tool can be used by adjusting the machining path. Below, we will show you how to machine oversized threads for each scene in a thread mill.
gauge In the case of minor diameter correction for passing
Please keep the program as it is and adjust the diameter correction. At that time, do not remove the clamp of the workpiece to prevent misalignment.
If you know the amount of oversize required by drawing instructions, etc.
ThreadPro can handle this.
・ size
On the thread size selection screen of Thread Pro, select "Custom" for the thread type.
If you select Custom, you can freely enter the size of the thread, so enter the specified size here, including the amount of oversize (diameter).
* When the M10 is specified in the +0.3mm drawing
10 + 0.03 = 10.03 Enter 10.03 in size .
* Before plating: Add 4 times the plating thickness to the size of the screw.
When a plating thickness of 20 μm (0.02 mm) is processed on an M10 thread: 10 + (0.02×4) = 10.08 Enter 10.08 in size .
・Pitch
Please enter the number as specified for the pitch.
・ Pilot hole
Pilot hole may be in the range of cutting Tap Pilot hole if there is no plating treatment.
If there is a plating process, enter the value obtained by adding "2 times the plating coating thickness " from "Cutting Tap Pilot hole ".
・In the case of mass production processing
If you want to improve the durability of the tool in mass production, etc., it is recommended that you select the thread type "Custom" in the thread size selection screen of ThreadPro and set the value of size (D) + the required oversize amount (4 times the plating thickness) in the size (D) input field of the thread.
(FAQID:14805)