What do these parameters such as power, speed, ppi, Hz, pass actually mean? Here is a brief explanation.

Power and speed parameters

The power and speed laser parameters are the most important settings in the material database. They can  set as a percentage between 0 and 100%.

The Power laser parameter describes the output power of the laser. 100% is maximum power. For dark wood engravings or stamp engravings, you generally need high power, whereas low values  used for materials such as paper.

The Speed laser parameter describes the movement of the laser head. Fast speeds lead to short exposure times, slow speeds lead to long exposure times. For example, large-scale engravings of TroLase materials engraved at high speeds between 80 and 100%, but for photo engravings with lots of detail on wood, the speed should not exceed 10%. This setting also affects the quality of the laser cut.

Note that cutting and engraving speeds are not comparable. Basically, cutting is slower than engraving. A “high” cutting speed is 10%.

PPI and Hz parameters

The PPI parameter (=pulses per inch) determines how many laser pulses per inch used for the engraving. To achieve a good result, this should be the same or a multiple of the dpi selected in the print setting. If you set this parameter to “Auto,” JobControl automatically determines the optimal resolution of the laser pulses.

During the cutting process, the Frequency parameter is decisive and is given in Hz (=Hertz). It specifies the number of laser pulses per second. For a CO₂ laser, the value can  set within a range of 1,000 to 60,000 Hz. For example, if you want to achieve a smooth edge when cutting acrylic, you need higher temperatures and thus this value is set to at least 5,000 to 20,000 Hz. On the other hand, when cutting wood a low frequency of 1000 Hz is necessary in order to achieve, for example, the brightest possible cutting edge.

Pass parameter

The Pass parameter determines the number of engraving or cutting passes. With some materials, for example, it can be advantageous to engrave with lower power and high speed, and then repeat this process several times. This means that the material is less stressed per pass. For example, this approach is appropriate for a relief engraving.

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