戻る
D stands for tool diameter.
It is expressed as several times the depth and length of the tool diameter, and is expressed as ○○D.
In drills and end mills, it is expressed as many times as the outer diameter of the tool, and in Tap , it is expressed as several times as the outer diameter of the thread. If the thread size is M20, it is calculated as Tap outer diameter φ20, and if it is M10, it is calculated as Tap outer diameter φ10.
Usage example (1)
Hole processing: φ6 hole depth 36mm
The hole depth is 6 times greater than the tool diameter. The AD-4D drill in the toolbox is four times the depth of the hole, so it is not long enough for this operation.
It would be a good idea to select an 8D type drill ADO-8D, whose hole depth is 8 times the diameter of the drill.
• Tap Machining depth
For the M10 2D, 10 (tool diameter is 10mm) × 2 = 20mm
If it is 1.5D of M20, then 20 (tool diameter is 20mm) × 1.5 = 30mm
Usage example (2)
This time, the thread processing is 20mm with M8.
The twisting length is 2.5D for the diameter of the tool, so choose a Tap for deep holes.
In this way, it is an expression used in processing and selection situations.
In OSG drills, the effective machining depth of the drill is expressed in the form of three times the drill diameter, as in the product name ADO-3D.
In addition, the product name of the end mill is expressed in the form of WXL-2D-DE, where flute length is twice the diameter of the tool.