CNC grooving tool – Face vs Radial difference

CNC grooving tool – difference between Face and Radial grooving tools

The CNC grooving tool is built differently for face and radial grooving. In a radial grooving holder the support section under the insert is straight, while in a face grooving holder it is curved.

CNC grooving tool - why a face grooving tool cannot be straight
CNC grooving tool - why a face grooving tool needs to be curved

Without the curve the holder will not enter the groove at all, and will foul with it. Also, because of the curve, each face grooving holder will only work within a certain groove diameter range.

CNC grooving tool - face grooving tool dimensions in Sandvik catalog

Text source: Cadem NCyclopedia multimedia CNC training software.

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Gothic architecture – what is it ?

I keep coming across buildings in India that are a mix of architectural styles. CST (alias VT station) in Mumbai is an amalgam of Victorian Gothic + Traditional Indian architecture.

Source: I wondered what characterized each of these styles, and decided to start my education with Gothic. I learnt that Gothic architecture was characterized by three things: the pointed arch, the ribbed vault and the flying buttress.


A vault is a ceiling that is an arch-shaped structure, built over large spaces. The ribbed vault has a complex rib structure supporting the roof, unlike the more common barrel vault has a semi-circular roof. The ribbed vault allows far more complex architecture. The buttress is a support structure built against a wall to support the wall. The wall tends to be pushed outwards because of the weight of the roof, and the buttress prevents this. Unlike an ordinary buttress, a flying buttress does not support the whole wall. It transfers the load from the top of the wall to a vertial column and thence to the ground.

By Maltesedog at the English language Wikipedia,
CC BY-SA 3.0,