Firmware systems  BT-BTA  have been designed to produce keyways and large inside/outside figures on CNC machines.

This means that in this context the firmware   executed after a series   other operations on the same machine: after   turning, drilling, milling, etc.,  without removing the workpiece from the machine, you can   switch to keyway piercing with obvious advantages both in terms of machining accuracy and economy.   

For this type of processing, BM offers two solutions:

The first solution is the device  WT, consisting of  holders and nozzles. This tool   especially suitable for CNC machines (turning, milling, machining center) with “y” axis and CNC machines designed specifically for broaching (grooving). The exact position of the tool in relation to the internal broaching hole   achieved using all the operating functions of the CNC.

The tool is available in two gripping diameters:

Ø 25 and Ø 32. Useful piercing depth varies from a minimum of 30 mm to a maximum of 200 mm.

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Second decision  is a system  VTA, consisting of a BT device (holder + nozzle) and an eccentric adjusting sleeve.   This system from   three components   very suitable for CNC machines that do not have a “y” axis. Indeed, in cases where the lathe does not have a “y” axis, the concentricity of the tool  BTA  in relation to the inner hole, for firmware, is provided by moving the eccentric sleeve in one or the other direction. By means of the sleeve measuring scale it is possible to eliminate symmetry errors which are often encountered in this type of machining. The eccentric bushing is available in three sizes with outer diameters: 32–40–50, the axis of the inner hole is shifted by 0.5 mm in relation to the bushing axis.

The solution found in the design of the BTA system has been patented as it is truly innovative in the field of keyhole piercing.

At the moment, the market is mainly represented by a stationary tool, that is, unregulated, therefore, the angular alignment of the tool occurs after a number of attempts, and in any case   without a measuring scale, which simplifies and speeds up the process itself.