EMAC-XT

EMAC-XT is a three-axis arc machining centre for busbar edge preparation, machining radii in both the width and thickness directions in a single setup. The BT40 spindle runs to 6000 rpm on 5.5 kW, and a six-position automatic tool changer with automatic tool calibration allows several edge profiles to be produced without operator intervention. Capacity is 3 to 15 mm thick and 30 to 230 mm wide, with a minimum workpiece length of 200 mm. Positioning and repeat positioning accuracy are both ±0.05 mm. Coolant is filtered and recycled. Installed power is 11 kW.

• Three-axis control with six-position automatic tool changer
• Automatic tool calibration
• Automatic lubrication
• Arc machining in both the width and thickness directions
• Coolant spray with automatic filtration and recycling
• Segmented feed-speed control
• Ships fully assembled — no on-site installation or commissioning required

Why chamfer a busbar at all?

Three reasons, all electrical or practical. A radiused edge distributes the electric field more evenly than a sharp corner, which raises the partial-discharge threshold. Insulation — heat-shrink, epoxy, film or overmould — conforms to a radius, where a sharp corner leaves air voids that become the breakdown initiation site. A radiused edge is also safe to handle during assembly. Edge radius is specified by the fabricator as an engineering means of meeting the clearance, creepage and dielectric provisions of IEC 61439.

What does the automatic tool changer add?

A six-position library with automatic change and automatic tool calibration, so a bar needing several edge profiles runs without operator intervention. Combined with three-axis control it machines arcs in both the width and thickness directions in one setup.