Making of an Accurate Hole with a Boring Bars

VITAP Throughfeed Boring Machines
The VITAP SIGMA 2TO Manual and SIGMA 2TA Automatic throughfeed drills are available with a working table of 2000 mm (78.75″), or 2500 mm (98.5″). They feature two opposing horizontal groups for simultaneous end boring in two sides and vertical boring with as many as six independent vertical groups.
The SIGMA 2TA is an automatic version with alternate horizontal/vertical drilling circuit belt conveyors fitted on pneumatic cylinders with front and side pneumatic pushers to align the panels.
These special machines are compact throughfeed drills and are priced both in standard configuration or custom designed for special applications.

SIGMA 2TO and 2TA Standard Specifications:
• Frame/working table length of 2000 mm or 2500 mm.
• Mechanical digital readouts control the vertical positioning of the two horizontal heads, longitudinal positioning of the right horizontal group and all the vertical groups. Readout finetunes down to one tenth of a millimeter.
• Digital readout for setting of boring depth.
• VITAP quick-change system supplied on all heads. Number of chucks supplied varies with different configurations.
• Two horizontal end boring groups, each with 21 spindles. The right group moves on bearings on a round bar guide by a rack and pinion system, and can collapse out of the way in case panels longer than the working tables need to be bored (model SIGMA 2TO only).
• Up to six vertical groups, each with two 9-spindle swiveling heads (split heads) for a total of 18 spindles per group. Horizontal movement of the groups is the same round bar, rack & pinion described above. On request, 11 or 13 spindle heads can be supplied.
• Manual locking of the right horizontal group.
• The right side horizontal boring group can be moved over any of the vertical boring groups when drilling narrow parts.
• Pneumatic locking of transversal movement of the vertical groups, as well as rotation of the split heads. Longitudinal movement of the vertical boring groups is obtained with a crank handle with a rapid gear ratio. Fine-tuning is achieved with a separate knob that can register down to tenths of millimeters.