CATIA - LATHE MACHINING 2 Product (LMG)

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Documentation Addenda

Geometry for Rough Turning The Start Limit option allows you to specify a point, line, curve or face as the start element of the Stock profile. If a face is specified, the start element is the intersection of the face and the working plane. The position of the start of machining is also defined with respect to this element by one of the following settings: None / In / On / Out. The Start Limit relimits input stock only and does not affect the part profile.

When a valid Start Element (under Geometry tab) is selected in one of its mode IN/ON and OUT mode, the Input Stock can be limited or varied in its length. The machined area computation is based on the Stock modified by this Start Limit. The tool path begins from this Start Element or Start Limit, depending on the limit mode chosen.

This is explained below for the Machining strategies, Back Location External Rough Turning, and applies also to other options of location and orientation.

The default behavior without defining a Start Limit for input stock (or when the Start Limit mode is None) is as follows:

  • the Part is extended up to the Stock (which could be held in a chuck) and the tool path is computed. In the picture below, the Part is extended on the left, towards the stock end, and the tool path is computed.

The pictures below show behaviors for Start Limit selected:

  • Mode IN:
  • Mode ON:
  • Mode OUT:

The End Limit option allows you to specify a point, line, curve, or face to relimit or extrapolate the selected part profile. This also relimits the input stock. If a face is specified, the end element is the intersection of the face and the working plane. The position of the end of machining is defined with respect to this element by one of the following settings: None / In / On / Out. The part profile is relimited or extrapolated in this direction. The input stock is also relimited by end element in this direction.