The first attempt to build a roof truss machining system resulted in a “drop stop” system in 1982. The system consisted of a saw, which could be positioned at an angle and a center position. The longitudinal positioning of work pieces was not yet implemented. The machine was provided with a number of pneumatic stops, which were manually positioned on a guide rail with the help of a scale. In the production the desired fold down stop was activated and the work piece was pressed against the stop before the saw cut was executed. The system could also be equipped with a drilling and milling unit.
The first proper roof truss machining system was first launched in 1984. The machine was equipped with a control system and automatic positioning of the work pieces. The process was programmed via a small screen and a keyboard and the programs could be stored for later use. The machine was in the basic version equipped with a Gripper unit for the positioning of the work pieces and a rotating and tilting saw, a milling unit and a drill. Most plants were also equipped with various items like notching units, tenon units, marking and extra drills. The system could also be complemented with planners. Some plants have been built as blockhouse machining systems. The machines were continuously improved and got more and more automated.
In 1988, a new controller was introduced with the possibility to save programs on a RAM card. Burmek had also developed software for office-use with the possibility to story machining programs on a RAM-card. The RAM-card could be plugged in to the machines RAM-card reader and presented to the operator for production. This also gave the possibility to generate machining programs directly from a roof truss CAD-program.
The machine was also equipped with a new positioning because the Hundegger-company had applied for and got the patent for the gripping system used by the Burmek SPL270.1.
The SPL 270-2 was replaced in 1989 by the 270-3 machine with a new positioning system. A new concept for the work piece positioning was developed and a universal milling head had been developed. The new head could cut automatically in three dimensions. The degree of automation had been increased again.
The SPL270-4 with a new PC-PLC control system was introduced in 1994. The machine got an industrial PC with a floppy station and a the possibility for a network connection. The SPL 270-4 system could also be equipped with a “pyramid” cutter, for the cutting of “Grad-“ and “Kehlkerven”.