Weldon 还是 Whistle Notch？为什么这两种柄不能互换

两种侧向锁紧的柄、两种平面，以及现场真的会发生的错误：把 whistle notch 的刀具装进 Weldon 刀柄，或者反过来。它们像到装得进去，又差到会出事。

Weldon —— 与轴线平行的平面，用止付螺丝锁紧。DIN 6359 / 1835B

Whistle notch —— 带 2° 斜度的平面，锁紧时把刀具往座面拉回。DIN 1835E

一张表看差别

Weldon, DIN 1835-B	The flat isparallel to the axis. The set screw pushes sideways onto the flat. Axial position is set by how far you push the tool in.
Whistle notch, DIN 1835-E	The flat isinclined— Mongtec cuts it at 2°. As the screw tightens it also pulls the tool back against the seat, so the axial position is defined by the holder, not by the operator.

Weldon, DIN 1835-B

The flat isparallel to the axis. The set screw pushes sideways onto the flat. Axial position is set by how far you push the tool in.

Whistle notch, DIN 1835-E

The flat isinclined— Mongtec cuts it at 2°. As the screw tightens it also pulls the tool back against the seat, so the axial position is defined by the holder, not by the operator.

混用会发生什么事

whistle notch 刀具装进 Weldon 刀柄：止付螺丝只会接触到斜面的一个边缘。接触面积塌掉，螺丝可能在刀柄上压出痕迹，而刀具在轴向负载下会慢慢跑出来。

Weldon 刀具装进 whistle notch 刀柄：螺丝顶在一个平行平面上，没有往回拉的效果。轻切削是撑得住，但你失去的正是当初选 whistle notch 的理由 —— 轴向重复性。

该选哪一种

Weldon 用在粗铣、大侧向负载，以及任何你希望连接方式越单纯越好的场合。它是现场最常见的柄。

whistle notch 用在换刀之间轴向位置很重要的场合 —— 阶梯钻孔、深度要求严格的挖槽，或任何刀具跑出零点几毫米就会让工件报废的加工。

Mongtec 的型号范围

Weldon	ø6 to ø50 mm on BT, BBT and HSK-A tapers. Coolant-through version available — the article number ends in K.
Whistle notch	ø6 to ø40 mm, flat at 2°.
Set screws	One screw up to ø20 mm; two screws from ø25 mm upward.

Weldon

ø6 to ø50 mm on BT, BBT and HSK-A tapers. Coolant-through version available — the article number ends in K.

Whistle notch

ø6 to ø40 mm, flat at 2°.

Set screws

One screw up to ø20 mm; two screws from ø25 mm upward.

如果你不确定手上是哪一种

拿一把直尺贴着那个平面。整段都贴平，就是 Weldon；有一端翘起来，就是 whistle notch。边界不好判断就拍张照片给我们 —— 我们宁可先确认，也不要你收到错的刀柄。