Siemens sinumerik 840d Programming Manual

Also see for SINUMERIK 810D: Programming manual Programming manual Programming manual Function manual Function manual

Contents

8 04.00 Tool Offsets8.5 Activate 3D tool offsets 8840DNCU 572NCU 573840Di Siemens AG 2000. All rights reservedSINUMERIK 840D/840Di/810D/FM-NC Programming Guide Advanced (PGA) − 04.00 Edition 8-2833D tool offset, tool changeA new tool with changed dimensions (R, r, a) or adifferent shape may be specified only throughprogramming G41 or G42 (transition G40 to G41 orG42, reprogramming of G41 of G42).This rule does not apply to any other tool data, e.g.tool lengths, so that tools to which such data applycan be fitted without reprogramming G41 or G42.Correction of the pathWith respect to face milling, it is advisable toexamine what happens when the contact point"jumps" on the tool surface as shown in the exampleon the right where a convex surface is beingmachined with a vertically positioned tool.As a general rule, it is advisable to select a toolshape and tool orientation that are suitable forproducing the required surface profile.The application shown in the example shouldtherefore be regarded as a borderline case.This borderline case is monitored by the control thatdetects abrupt changes in the machining point onthe basis of angular approach motions between thetool and normal surface vectors. The control insertslinear blocks at these positions so that the motioncan be executed.These linear blocks are calculated on the basis ofpermissible angular ranges for the side angle storedin the machine data.The system outputs an alarm if the limit valuesstored in the machine data are violated.Single point