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Milling cutter shank type
From type division to selection points, understand the milling tool holder system
Tool holders commonly used in machining centers
On the machining center, all kinds of tools are installed on the tool magazine, and the tool selection and tool placement action are carried out at any time according to the program regulations, so the standard tool holder must be used to make the standard tools used in drilling, boring, expanding, milling and other processes quickly and accurately installed on the machine tool spindle or tool magazine. The most widely used in our country are BT40 and BT50 series tool holders and rivets.
 
3.3.1 Commonly used tool holders in machining centers
The types and application scopes of commonly used tool holders in machining centers are shown in Table 3-4.
Table 3-4 Types and application scopes of commonly used tool holders in machining centers
Tool holder specifications commonly used in machining centers
The specifications of tool holders commonly used in machining centers are shown in Table 3-5~Table 3-12.
Table 3-5 Flattening tool holder mm
Table 3-6Spring chuckHandle mm
 
Model specifications
size
fittings
L
D
d
Spring chuck
nut
JT/BT40-QER40-75
75
63
>3.0 〜20
ER40-d
ER40-T2
JT/BT40-QER40-120
120
ER40-d
JT/BT45-QER20-75
75
35
>2. 5〜13
ER20-d
ER20-T1
JT/BT45-QER20-120
120
ER20-d
JT/BT45-QER25-75
75
42
>2. 5〜16
ER25-d
ER25-T2
JT/BT45-QER25-120
120
ER25-d
JT/BT45-QER32-75
75
50
>3. 5〜20
ER32-d
ER32-T2
JT/BT45-QER32-120
120
ER32-d
JT/BT45-QER32-90
90
63
>3.0 〜26
ER40-d
ER40-T2
JT/BT45-QER32-150
150
ER40-d
JT/BT50-QER20-75
75
35
>2. 5〜13
ER20-d
ER20-T1
JT/BT50-QER20-120
120
ER20-d
JT/BT50-QER25-90
90
42
>2. 5〜16
ER25-d
ER25-T2
JT/BT505-QER25-150
150
ER25-d
JT/BT50-QER32-90
90
50
>3. 5〜20
ER32-d
ER32-T2
JT/BT50-QER32-150
150
ER32-d
JT/BT50-QER40-90
90
63
>3.0 〜26
ER40-d
ER40-T2
JT/BT505-QER40-150
150
ER40-d
Table 3-7 End face milling cutter holder mm

 

 

Table 3-8 Three-sided milling tool shank mm
Table 3-9 Side-fixed tool holder mm
Table 3-10 BT-MTBMohs taperHandle mm
Table 3-11Drill chuckHandle mm
Table 3-12Tapping chuckHandle mm

 

No one tool holder system is one-size-fits-all. Tool holders built for high-speed finishing processes often lack the rigidity and strength required for efficient machining, such as rough blank castings. In contrast, tool holders used for roughing often lack dynamic balance, which allows the tool holder to operate smoothly at high speeds during the finishing process.

Additionally, the thick design and large volume of roughing tool holders can limit their reach for finer or deeper part features. whereasDifficult-to-machine materialsA tool holder with enhanced strength and rigidity is required. In addition, the vibration damping capacity of the tool holder and the ability to deliver coolant are also important selection criteria. Using an unsuitable tool holder can lead to dimensional errors and part scrap, as well as excessive wear on the machine spindle, reduced tool life, and increased risk of tool breakage.

In non-critical operations, an inexpensive tool holder may yield satisfactory results. However, in processes where repeatable accuracy must be achieved, especially when expensive workpiece scrap reduces part margins, investing in application-focused, high-quality tool holders can protect against such unexpected losses at a lower cost.

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