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For milling and indexable tools, the following three numbers are required:
(1) Rotation speed (min-1)
How many revolutions per minute .
In NC code, it is expressed by "S". Example: 300 revolutions per minute = S300
(2) Feed speed Vf(mm/min)
How many millimeters of tool moves in one minute?
In NC code, it is expressed by "F". Example: The spindle (or table) moves by 200 mm per minute = F200
(3) Depth of cut (AP and AE)
"AP" refers to how many millimeters of incision is made in the axial direction at a time.
"ae" indicates the number of millimeters of incision to be made in the radial direction at a time, and in the case of slotting the value is equal to the diameter of the tool.
The catalog conditions are introduced in the range, so please try from the lowest first.
(1) Rotation speed (min⁻¹)
Rotational speed (min⁻¹) = Cutting speed (m/min)× 1000 ÷ 3.14 ÷ Tool diameter (Φ)
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(2) Feed speed Vf(mm/min)
In the condition table of the end mill, the feed rate Vf is described.
The indexable does not have a feed rate Vf, but is described in terms of the feed amount per blade (mm/t). The feed rate Vf (mm/min) is calculated using the number of flutes of the tool to be used, the feed amount per blade (mm/t), and the rotation speed obtained in (1).
How to calculate the feed rate
Feed rate Vf (mm/min) = Feed amount fz per blade (mm/t) × number of flutes (z) × Rotation speed (min⁻¹)
* Since the expression method differs depending on the tool, it is recommended to recapture it as the feed amount (mm / rev) per revolution for each, as it will be calculated in the same way as other tools, and it is easy to understand.
Feed per revolution (mm/rev) = Feed per blade (mm/t) × Tool number of flutes
Rev: Abbreviation for revolution. The meaning of 1 revolution, 1 lap.
| (1) Side cutting | (2) slotting |
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* Catalog notation emphasizes efficiency. If stability and durability are important, you need to adjust from there.
* It is common to adjust the conditions of the end mill at the rotation speed while keeping the feed amount (mm/rev) per revolution as it is. For example, it is safe to start with a value of 0.7~0.8 for both the rotation speed and the feed rate of the catalog conditions×
(3) Depth of cut (AP and AE)
The cutting depth (AP) and cutting width (AE) to be cut at one time are determined from the catalog condition table.
It should be noted that both (1) ~ (3) are greatly related to the machining load.
If the load is large, the tool or workpiece will touch, causing vibration and vibration.
Adjust from the catalog condition range according to the machine rigidity, workpiece rigidity, desired surface roughness, machining efficiency, etc.
Indexable Tools
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(1): Side cutting (2): slotting
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