Use : 
Features : At each end of the index movement, the tool is positioned at "X", at the last programmed value and "Y" at 0, for the selected tool. Why the G903? : This saves programming time because it is now no longer necessary to calculate the radius or determine the direction of circular movement (G2 or G3). Valid from version 4.3 of the TB-DECO onwards. G903: Tool indexing Improvement The macro G903 allows optimum tool indexing by way of circular G2/G3 interpolation. In previous versions, this macro was restricted purely to indexing tools for thread chasers 1 & 2, i.e. axes X1/Y1 and X2/Y2. This limitation has now been overcome and the macro G903 enables tool indexing for all program operation lines. For example, it is possible to program the indexing of tool positions for end machining or of tool positions for counter operations. Limitation The G903 works out an ideal path by circular interpolation so as to change from one tool position to the other. This is why the current tool and tool being indexed must be within the same tool group. What is understood by tool group are those tools, where the tens identifying the support number are the same.
Why G903? Using the G903 saves time during programming and allows for improved management of the machineís energy resources. Indexing not generated by G903 requires 3 accelerations and decelerations, whilst the G903 only requires one acceleration and deceleration. In such cases, the mechanics (recirculating ball screws, guides) will be less tried and tested (see diagram below). Advantages The G903 automatically takes account of tool geometry. If the tool undergoing indexing has a different geometry to the current tool, a linear movement will automatically be created before the circular indexing movement. Consequently, the indexed tool will find itself back in precisely the same position as the previous tool. Indexing the tools through a circular movement considerably reduces the risk of collision, unlike indexing by way of linear interpolation. The radius creates a natural clearance, thereby avoiding collisions.  Without G903  With G903THINK PARTS THINK TORNOS ascl.com | ||||||||||||||||||||||||||
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TORNOS SA Rue Industrielle 111 CH-2740 Moutier Switzerland |
Tel.: +41 (0)32 494-4444 Fax: +41 (0)32 494-4903 www.tornos.com |
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