The xy-controller takes longer to make a corner than a straight line so the corners (particularly the inside corners) absorb too much energy and tend to melt and become over-stressed. While the pulse rate proportional to time method is more common and easier to program initially, this method usually results in burned inside corners. The pulse rate can be controlled in two ways: proportionally to time or proportionally to distance traveled. The beam of the laser is actually a series of small bursts or pulses, not a continuous stream. The pulse rate of a laser (measured in pulses per second – pps) is the rate at which a laser “fires”. A faster feed rate with a more rapid pulse rate will generally result in an edge with lower stress but a less glossy surface. Increasing the power of the laser at a given feed rate usually will result in a more glossy finish, but it also increases the level of stress in the edge of the sheet.
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